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Fuji Electric BW32AAG Technical Information

Molded case circuit breakers & earth leakage circuit breakers
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Molded Case Circuit Breakers & Earth Leakage Circuit Breakers
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62D4-E-0058

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Summary of Contents for Fuji Electric BW32AAG

  • Page 1 DISTRIBUTION Molded Case Circuit Breakers & Earth Leakage Circuit Breakers Technical information 62D4-E-0058...

  • Page 3: Table Of Contents

    C O N T E N T S Environment and usage Chapter Protecting low-voltage circuits Chapter precautions 1-1 Description ..............4 4-1 Standard conditions ............90 1-2 Overcurrent protection ............ 5 4-2 Application to special environments ......91 1-3 Phase-loss protection ............. 6 4-3 Connection precautions ..........
  • Page 4 Introduction FUJI has employed its comprehensive technical expertise to bring a complete range of models and features to its line of molded case circuit breakers (MCCBs), the mainstay for low-voltage overcurrent protection devices. A more complete line of breakers is combined with better performance and greater economy to yield a wider selection of products than ever before.
  • Page 5 Protecting low-voltage circuits Chapter CONTENTS 1-1 Description ........................4 1-2 Overcurrent protection 1-2-1 Overcurrent fault ......................5 1-2-2 Overcurrent protection ....................5 1-3 Phase-loss protection 1-3-1 Phase-loss fault .......................6 1-3-2 Phase-loss burnout protection (three-phase circuit) ............6...

  • Page 6: Chapter 1 Protecting Low-Voltage Circuits

    Protecting low-voltage circuits 1-1 Description 1-1 Description The most common faults occurring with low-voltage circuits are overcurrent (resulting from overload or short-circuit), ground faults, and phase-loss. A device that will protect equipment from these faults is therefore needed for reliable and economical operation.

  • Page 7: Overcurrent Protection

    Protecting low-voltage circuits 1-2 Overcurrent protection 1-2 Overcurrent protection 1-2-1 Overcurrent fault Overcurrent occurs when a circuit is exposed to current that is higher than the rated load current. It may be due to short circuiting in a circuit or to overloading that occurs when a motor overloads or the rotor locks.

  • Page 8: Phase-Loss Protection

    Protecting low-voltage circuits 1-3 Phase-loss protection 1-3 Phase-loss protection 1-3-1 Phase-loss fault (1) Three-phase power supply circuit A phase-loss fault occurs when there is a disconnection in one of the phase wires. If a motor continues running under those conditions, the result is an imbalance in the current flow to the motor windings that can generate enough heat to burn out the windings.
  • Page 9 Operating characteristics and performance Chapter CONTENTS 2-1 Overcurrent tripping characteristics 2-1-1 Types of tripping ......................8 2-1-2 Factors affecting overcurrent trip characteristics ............8 2-2 Breaking performance 2-2-1 Short-circuit current breaking ..................11 2-2-2 Breaking characteristics ....................12 2-2-3 Arc space ........................13 2-2-4 Reset time ........................25 2-3 Overload switching performance ..............26 2-4 Performance with current at 100%...

  • Page 10: Overcurrent Tripping Characteristics

    The trip is also referred to as a long-time Hydraulic- BW32AAG, BW32SAG EW32AAG, EW32EAG delay trip to distinguish it from the shorter tripping time of the magnetic EW32SAG short-time delay trip.
  • Page 11 Horizontal Slant 15° Slant 45° Slant 15° Slant 45° (upside (backward) (backward) (forward) (forward) down) MCCB ELCB (Reference) BW32AAG, BW32SAG EW32AAG, EW32EAG 100% 115% 105% 110% EW32SAG BW50AAG, BW50EAG EW50AAG, EW50EAG BW50SAG, BW50RAG EW50SAG, EW50RAG BW63EAG, BW63SAG EW63EAG, EW63SAG BW63RAG...
  • Page 12 Operating characteristics and performance 2-1 Overcurrent tripping characteristics (5) Frequencies (a) Commercial frequencies (50Hz, 60Hz) The characteristics of breakers are generally the same at 50 and 60Hz. (b) Direct current (DC) If an MCCB designed for operation in an AC circuit were used in a DC circuit, its operating characteristics would change as shown in Table 2-5.

  • Page 13: Breaking Performance

    Operating characteristics and performance 2-2 Breaking performance 2-2 Breaking performance 2-2-1 Short-circuit current breaking Fig. 2-4 illustrates how a short-circuit current is broken. Fig. 2-5 Three-phase short-circuit current breaking test oscillograms 460V AC, 3-phase Fig. 2-4 Short-circuit current breaking Supply voltage Available short-circuit current 2 2 460 V Actual short-circuit current...

  • Page 14: Breaking Characteristics

    Operating characteristics and performance 2-2 Breaking performance (3) Operating duty 2-2-2 Breaking characteristics Under conditions where the displayed rated breaking capacity (1) Breaking performance is specified, breakers will break properly at an operating duty The characteristics that define MCCB breaking performance of “O”...

  • Page 15: Arc Space

    Operating characteristics and performance 2-2 Breaking performance flow until completion of breaking. The time interval between (4) Breaking characteristics the occurrence of a short-circuit fault and the opening of the When the magnitude of an overcurrent exceeds a certain contacts is called the contact opening time. The time interval limit, the instantaneous trip device is actuated to open the between completion of breaking and quenching of the arc pole immediately.
  • Page 16 Operating characteristics and performance 2-2 Breaking performance Fig. 2-8 Max. let-through I t 230V AC (16)* 35mm (12) 30mm (8.18) 25mm BW630EAG, RAG, HAG BW800EAG, RAG, HAG EW630EAG, RAG, HAG EW800EAG, RAG, HAG (6.8) 22mm BW630RAGU, HAGU BW800RAGU, HAGU EW630RAGU BW400EAG, SAG, RAG, HAG (3.35) 16mm EW400EAG, SAG, RAG, HAG...
  • Page 17 Operating characteristics and performance 2-2 Breaking performance Fig. 2-9 Max. let-through I t 400V AC BW630EAG, RAG, HAG BW800EAG, RAG, HAG EW630EAG, RAG, HAG EW800EAG, RAG, HAG BW630RAGU, HAGU BW800RAGU, HAGU (16)* 35mm EW630RAGU (12) 30mm BW400EAG, SAG, RAG, HAG EW400EAG, SAG, RAG, HAG (8.18) 25mm BW400EAGU, SAGU, RAGU, HAGU...
  • Page 18 Operating characteristics and performance 2-2 Breaking performance Fig. 2-10 Peak let-through current 230V AC 1000 Unlimited BW630EAG, RAG, HAG BW800EAG, RAG, HAG EW630EAG, RAG, HAG EW800EAG, RAG, HAG BW400EAG, SAG, RAG, HAG EW400EAG, SAG, RAG, HAG BW250JAG, SAG, RAG, HAG BW160JAG, SAG, RAG EW250JAG, SAG, RAG BW250EAG...
  • Page 19 Operating characteristics and performance 2-2 Breaking performance Fig. 2-11 Peak let-through current 400V AC 1000 Unlimited BW630EAG, RAG, HAG BW800EAG, RAG, HAG EW630EAG, RAG, HAG EW800EAG, RAG, HAG BW400EAG, SAG, RAG, HAG EW400EAG, SAG, RAG, HAG BW250JAG, SAG, RAG, HAG BW160JAG, SAG, RAG EW250JAG, SAG, RAG EW160JAG, SAG, RAG...
  • Page 20 Operating characteristics and performance 2-2 Breaking performance Maximum permissible cable stresses Current and energy limiting curves The table below indicates the maximum permissible thermal Ics = 100 % Icu stresses for cables depending on their insulation, conductor (Cu The exceptional limiting capacity of the BX range greatly or Al) and their cross-sectional area (CSA).
  • Page 21 Operating characteristics and performance 2-2 Breaking performance Current and energy limiting curves Energy-limiting curves Voltage 400/440 V AC Voltage 660/690 V AC Limited energy Limited energy 1.41 1.41 BX630 BX630 BX400 BX400 BX250 BX250 R, H BX100 BX100 BX160 BX160 30 40 50 70 100 150 200 300 30 40 50 70 100 150 200 300 kA rms...
  • Page 22 Operating characteristics and performance 2-2 Breaking performance Current and energy limiting curves Current-limiting curves Voltage 400/440 V AC Voltage 660/690 V AC Limited short-circuit current (k peak) Limited short-circuit current (k peak) BX630 BX400 BX630 k k BX250 BX400 BX100 BX160 BX250 BX100...
  • Page 23 Operating characteristics and performance 2-2 Breaking performance Current-limiting curves Thermal-stress curves Voltage 400/440 V AC Voltage 660/690 V AC Limited energy Limited energy BX800H BX1000H BX800R BX800H BX1250H BX1000R BX1000H BX1600H BX1250R BX1250H BX1600H BX1600R BX800R BX1000R BX1250R BX1600R BX630 BX630 BX400 BX400...
  • Page 24 − − BW50SBG EW50SBG − − − − BW63EBG EW63EBG − − − − BW63SBG EW63SBG − − − − BW32AAG EW32AAG − − − − − − EW32EAG BW32SAG EW32SAG BW50AAG EW50AAG − − − − − − BW50EAG...
  • Page 25 Operating characteristics and performance 2-2 Breaking performance Installation example Safety clearance Minimum distance between two Minimum distance between circuit adjacent circuit breakers breaker and front or rear panels Front panel B = 0 Bare or painted sheetmetal Note: if F < 8 mm: an insulating screen or long terminal shield is mandatory.
  • Page 26 Operating characteristics and performance 2-2 Breaking performance Safety clearances and minimum distances General rules BX800 to 1600 (fixed devices) When installing a circuit breaker, minimum distances (safety clearances) must be maintained between the device and panels, bars and other protection devices installed nearby. A (*) A (*) These distances, which depend on the ultimate breaking...

  • Page 27: Reset Time

    Reset time (Minute) MCCB ELCB (Reference) With overload current With short-circuit current tripping (Icu) breaking (200% of current) BW32AAG, SAG EW32AAG, EAG, SAG Hydoraulic-magnetic Immediately Immediately BW50AAG, EAG, SAG, RAG EW50AAG, EAG, SAG, RAG BW63EAG, SAG, RAG EW63EAG, SAG, RAG...

  • Page 28: Operating Characteristics And Performance

    Operating characteristics and performance 2-3 Overload switching performance 2-3 Overload switching performance Contacts should have no overt signs of damage, burn out, welding and other electrical or mechanical faults after an overload switching test is conducted in accordance with the stipulations (IEC 60947) in Table 2-9. Table 2-9 Overload switching test conditions Rated current Circuit condition...

  • Page 29: Performance With Current At 100

    Operating characteristics and performance 2-4 Performance with current at 100% 2-4 Performance with current at 100% 2-4-1 Temperature rise At the rated current, the temperature of MCCBs and ELCBs (reference) should not rise above the values given in Table 2-10 at any specification.
  • Page 30 Table 2-11 MCCB internal resistance and power consumption Type Rated current Internal Power Type Rated current Internal Power resistance consumption resistance consumption (m /phase) (W/3-phase) (m /phase) (W/3-phase) BW32AAG 101.0 BW125JAG 14.0 BW32SAG BW125RAG 39.3 11.8 14.2 BW32AFC BW125HAG 11.4 13.5 13.0 15.8 16.2 18.6 BW32SBG 116.0...

  • Page 31: Durability

    Operating characteristics and performance 2-5 Durability 2-5 Durability 2-5-2 Trip switching durability There are two types MCCB trip action: trip actuated by the 2-5-1 Switching durability overcurrent trip device, and trip actuated by accessories such MCCBs do not require the high-frequency switching as a shunt trip or undervoltage trip device.

  • Page 32: Switching Durability Of Accessories

    Operating characteristics and performance 2-5 Durability 2-5-4 Switching durability of accessories As Table 2-14 indicates, MCCB accessories whose switching capability requires consideration can be grouped into two types: accessories that are actuated by the switching of the MCCB, and those that are actuated when the MCCB trips. Accessories of the former type require a switching durability equivalent to the associated MCCB.

  • Page 33: Withstand Voltage Performance

    Operating characteristics and performance 2-6 Withstand voltage performance Fig. 2-12 Test circuit for rated impulse withstand voltage 2-6 Withstand voltage performance characteristics 2-6-1 Rated power frequency withstand voltage Impulse generator (IEC 60947-1, 2) (1) Circuit breaker body The breaker should function normally with 2000V applied for Air gap Specimen one minute at the following locations if it is rated at 300V or...

  • Page 34: Handle Operating Force And Angle

    Table 2-15 Handle operating force and angle Line side Trip Reset MCCB ELCB (Reference) Operating force (N·m) Operating angle ( radius r Trip Trip Reset (mm) Reset BW32AAG-2P EW32AAG-2P 0.42 0.54 0.89 17.5 – 26.9 BW32SAG-2P BW50AAG-2P EW50AAG-2P BW50EAG-2P BW50SAG-2P...
  • Page 35 Selection and application Chapter CONTENTS 3-1 Selection check points 3-1-1 MCCB selection check points ..................34 3-1-2 Selecting and MCCB ratings ..................36 3-1-3 Overcurrent protection principle ................... 37 3-1-4 Protective coordination ....................37 3-2 Cascade trip applications 3-2-1 Conditions for cascade (backup) trip coordination ............40 3-2-2 Criteria for cascade (backup) trip coordination ............40 3-3 Selective trip applications 3-3-1 Selective trip coordination of breakers ................43...

  • Page 36: Selection Check Points

    Selection and application 3-1 Selection check points 3-1 Selection check points (10) Accessories When applying MCCBs to low-voltage circuits it is necessary to consider their short-circuit breaking capacities, rated voltages, rated currents, installation details, protection systems, wire sizes and type of load (motor, capacitor, mercury arc lamp, etc.) Fig.
  • Page 37 Selection and application 3-1 Selection check points Table 3-1 Systematic MCCB selection Check point Check points for system Check points for circuits Check points for MCCBs Specifications of MCCBs designing and protective equipment Power supply capacity Series Total load capacity Short-circuit current Power supply system Frame size...

  • Page 38: Selecting And Mccb Ratings

    Selection and application 3-1 Selection check points 3-1-2 Selecting and MCCB ratings (3) Rated frequency (1) Rated ultimate short-circuit breaking capacity MCCBs for AC application are rated for operation at both 50 (Icu) and 60Hz. If these MCCBs are used in circuits having other frequencies, their operating performance, current carrying A breaker must be selected that has a rated ultimate short- capability, or breaking characteristics may be altered, and prior...

  • Page 39: Overcurrent Protection Principle

    Selection and application 3-1 Selection check points 3-1-3 Overcurrent protection principle 3-1-4 Protective coordination Fig. 3-2 is a schematic diagram of a typical low-voltage When an overcurrent fault occurs, an overcurrent (overload distribution system. The aim of overcurrent protection is to current or short-circuit current) flows from the power source safeguard the system against overcurrent faults, to ensure to the fault point.
  • Page 40 Selection and application 3-1 Selection check points Table 3-2 Low-voltage overcurrent protective coordination Kind of coordination Coordination between the protective Coordination between protective devices device and equipment to be protected Selective trip coordination Cascade (backup) trip coordination Objective Protecting equipment Improved power supply reliability Economical protective coordination Description...
  • Page 41 Selection and application 3-1 Selection check points (2) Selective trip coordination (3) Cascade (backup) trip coordination In the main circuit of facilities having a large power receiving Selective trip coordination requires that each protective capacity or in systems containing an important load, selective device have a sufficient short-circuit breaking capacity (fully- trip coordination should be used to provide improved power rated system).

  • Page 42: Cascade Trip Applications

    Selection and application 3-2 Cascade trip applications 3-2 Cascade trip applications 3-2-2 Criteria for cascade (backup) trip coordination 3-2-1 Conditions for cascade (backup) trip Various breaker-based breaker-breaker or breaker-fuse coordination combinations suitable for backup have been reported. A cascade (backup) system established between overcurrent However, testing and other standards are not well defined circuit breakers can yield a very economical system as for backup protection at this point.
  • Page 43 (backup) coordination. Table 3-5 (a) Summary of combinations used for cascade (backup) coordination 230V AC Branch circuit breaker Main circuit breaker model MCCB ELCB Icu (kA) (reference) BW32AAG EW32AAG 7.5 – – – – – – – – – –...
  • Page 44 Selection and application 3-2 Cascade trip applications Table 3-5 (b) Summary of combinations used for cascade (backup) coordination 400V AC Branch circuit breaker Main circuit breaker model MCCB ELCB Icu (kA) (reference) BW32SAG EW32SAG – – – – – – –...

  • Page 45: Selective Trip Applications

    Selection and application 3-3 Selective trip applications 3-3 Selective trip applications 3-3-1 Selective trip coordination of breakers When a breaker with ternary trip-element characteristics having a short-time delay trip element is used on the power Selective tripping is coordinated between the breaker on the supply side, selective trip coordination is much better than with power supply side and the one on the load side by setting general-used breakers because the allowable short-time delay...
  • Page 46 BX630HAE BX800HAE BX1000HAE BX1250HAE BX1600HAE breaker Protective Ternary trip-element (long-time delay, short-time delay, instantaneous) characteristics In [A] 1000 1250 1600 Control unit Branch circuit breaker Icu [kA] (sym) BW32AAG BW50AAG BW50EAG BW63EAG BW100AAG BW100EAG BW250EAG BW400EAG BW630EAG BW800EAG BW32SAG BW50SAG BW63SAG BW125JAG...
  • Page 47 BX630HAE BX800HAE BX1000HAE BX1250HAE BX1600HAE breaker Protective Ternary trip-element (long-time delay, short-time delay, instantaneous) characteristics In [A] 1000 1250 1600 Control unit Branch circuit breaker Icu [kA] (sym) BW32AAG BW50AAG BW50EAG BW63EAG BW100EAG BW250EAG BW400EAG BW630EAG BW800EAG BW32SAG BW50SAG BW63SAG BW125JAG BW250JAG...
  • Page 48 Selection and application 3-3 Selective trip applications Table 3-6 (a) Selective trip coordination ● AC230V ELCB [Unit : kA] Main circuit BX100HAE BX160HAE BX250HAE BX400HAE BX630HAE BX800HAE BX1000HAE BX1250HAE BX1600HAE breaker Protective Ternary trip-element (long-time delay, short-time delay, instantaneous) characteristics In [A] 1000 1250...
  • Page 49 Selection and application 3-3 Selective trip applications ● AC440V ELCB [Unit : kA] Main circuit BX100HAE BX160HAE BX250HAE BX400HAE BX630HAE BX800HAE BX1000HAE BX1250HAE BX1600HAE breaker Protective Ternary trip-element (long-time delay, short-time delay, instantaneous) characteristics In [A] 1000 1250 1600 Control unit Branch circuit breaker Icu [kA] (sym) EW32EAG...

  • Page 50: Selective Trip Coordination Between Mccbs And High-Voltage Side Protective Devices

    Selection and application 3-3 Selective trip applications Fig. 3-7 PF·S high-voltage power receiving facility 3-3-2 Selective trip coordination between MCCBs and high-voltage side protective devices LBS with power fuse (PF) (1) Coordination between MCCBs and power fuses In type PF·S high-voltage power receiving facilities like those shown in Fig.

  • Page 51: Selective Trip Coordination With A High-Voltage Fuse

    JC type power fuse rated current (A) 20 CB breaking MCCB type ELCB type CB rated current (A) capacity (kA) ＊ ＊ ＊ ＊ ＊ ＊ BW32AAG– (2,3)P○○○ EW32EAG–3P○○○ 5 to 32 BW50AAG– (2,3)P○○○ EW50AAG– (2,3)P○○○ 5 to 50 ＊ ＊ ＊ ＊ ＊ ＊...
  • Page 52 Selection and application 3-3 Selective trip applications Table 3-7 (b) Selective trip coordination between MCCB and 24kV power fuse Transformer Capacity (kVA) 1,000 1,250 1,600 2,000 Primary current (A) 11.6 14.5 18.2 23.1 46.5 Secondary current (A) 1,160 1,440 1,800 2,300 2,890 % impedance (%) Primary short-circuit current when 1,156...
  • Page 53 Selection and application 3-3 Selective trip applications Table 3-7 (b) Selective trip coordination between MCCB and 24kV power fuse (Continued) Transformer Capacity (kVA) 1,000 1,250 1,600 2,000 Primary current (A) 11.6 14.5 18.2 23.1 46.5 Secondary current (A) 1,160 1,440 1,800 2,300 2,890 % impedance (%) Primary short-circuit current when 1,156...

  • Page 54: Wiring Protection

    Selection and application 3-4 Wiring protection 3-4 Wiring protection 3-4-1 Description dt=JMCd Wiring must be protected against the heat generated by × transforms as where overcurrents. When a circuit fault occurs, the overload or short- circuit current flowing into the fault point generates heat in the wire to raise the wire temperature.
  • Page 55 Selection and application 3-4 Wiring protection Table 3-9 (a) Current squared time i t=5.05 log ((234+ )/(234+ IEC wiring values JIS wiring values (Reference) Wire cross section (S) Wire cross section (S) Current squared time ( 10 Current squared time ( 10 Starting at 70°C (i Starting at 30°C (i Starting at 60°C (i...

  • Page 56: Application Of Protective Devices

    Selection and application 3-4 Wiring protection 3-4-3 Application of protective devices (2) Wiring protection by MCCBs (1) Principle The MCCB to be used for overcurrent protection of wiring can be selected by observing the principle in item (1). In When an overcurrent fault occurs, a circuit breaker must be the short- time region discussions, remember that the chosen that can interrupt an overcurrent before the wire is tripping characteristic curve of an MCCB may cross the...
  • Page 57 (mm current (A) current current I (kA: peak) ( 10 A MCCB ELCB Rated current (A) BW32AAG EW32AAG 3 (MCCB only), 5, 10, 15, 20, 30, 32 0.06 0.082 BW50AAG EW50AAG 5, 10, 15, 20, 30, 32, 40, 50 0.06 0.082...
  • Page 58 (mm current (A) current current I (kA: peak) ( 10 A MCCB ELCB Rated current (A) BW32AAG 3, 5, 10, 15, 20, 30, 32 0.03 0.082 BW50AAG 5, 10, 15, 20, 30, 32, 40, 50 0.03 0.082 BW100AAG 60, 63, 75, 100 0.03...

  • Page 59: Motor Circuit Applications

    Selection and application 3-5 Motor circuit applications secs. Pump motors require a shorter starting time, while fans 3-5 Motor circuit applications and blowers require a longer time to reach operating speed. 3-5-1 Description Fig. 3-14 Starting power factor example of induction motors Individual or tandem overcurrent protective devices are installed in motor circuits to provide the motor with overload and locked rotor protection and to provide the wiring with...
  • Page 60 Selection and application 3-5 Motor circuit applications Fig. 3-16 Motor breaker protection coordination (2) Motor circuit protection by motor breaker Motor breaker characteristics The overcurrent trip characteristics of a single MCCB may be used to protect the motor and the wiring at the same time. Cable allowable characteristics (See Fig.
  • Page 61 Selection and application 3-5 Motor circuit applications (a) 400V AC Combined Motor output Motor rated Motor rated Manual motor Manual motor starter magnetic (kW) current (A) current starter rated Icu (kA) contactor multiplying current (A) factor (A) 1.2 SC-03 0.55 0.66 –...
  • Page 62 Selection and application 3-5 Motor circuit applications Fig. 3-18 Protection coordination characteristics curve in motor (3) Magnetic motor starter and MCCB motor circuit circuits protection TOR's operating characteristics These arrangements consist of a magnetic motor starter and line protection or instantaneous trip type of MCCB. The Motor allowable characteristics starter’s thermal overload relay operates in the presence of MCCB's operating characteristics...
  • Page 63 (a) 230V AC 3-phase induction motor Contactor Thermal Motor ratings MCCB Icu (kA) type overload rated Current Output relay type current (kW) SC-03 TR-0N/3 BW32AAG BW32SAG BW50SAG BW32AAG BW32SAG BW50SAG 0.75 BW32AAG BW32SAG BW50SAG BW50RAG BW125JAG BW125SAG BW125RAG BW50HAG BW32AAG BW32SAG BW50SAG BW50RAG...
  • Page 64 Selection and application 3-5 Motor circuit applications Table 3-14 Selection of line protection MCCB and ELCB (for reference) (b) 400V AC 3-phase induction motor Contactor Thermal Motor ratings MCCB Icu (kA) type overload rated Current Output relay type current (kW) SC-03 TR-0N/3 0.65...

  • Page 65: Applications On The Primary Side Of Transformers

    Selection and application 3-6 Applications on the primary side of transformers 3-6 Applications on the primary side of transformers 3-6-1 Inrush current for transformer excitation 3-6-2 Selecting an MCCB for transformer primary circuit The voltage V applied to the transformer in the normal condition is balanced by the voltage e induced by changes in The MCCB to be selected must be capable of carrying the magnetic flux in the core.

  • Page 66: Transformer Primary-Side Circuit Selection

    In: Rated primary current (rms A) 13.1 Irush: Exciting inrush current (rms A) 15.4 30.8 46.3 61.7 92.5 154.2 231.3 308.4 Short-circuit 1.5 (kA) BW32AAG–3P003 BW32AAG–3P005 BW32AAG–3P010 BW50SAT–3P015 BW32SAT–3P020 current at 440V 2.5 (kA) BW32SAG–3P003 BW32SAG–3P005 BW32SAG–3P010 BW50SAT–3P015 BW32SAT–3P020 7.5 (kA) BW50SAG–3P005...
  • Page 67 Transformer capacity (kVA) In: Rated primary current (rms A) 11.4 Irush: Exciting inrush current (rms A) 28.4 56.8 85.2 113.6 170.5 284.1 Short-circuit 1.5 (kA) BW32AAG–2P003 BW32AAG–2P010 BW32AAG–2P015 BW32SAT–2P015 current at 440V 2.5 (kA) BW32SAG–2P003 BW32RAG–2P010 BW32SAG–2P015 BW32SAT–2P015 7.5 (kA) BW50SAG–2P010 BW50SAG–2P015...

  • Page 68: Welder Circuit Applications

    Selection and application 3-7 Welder circuit applications Fig. 3-22 Typical intermittent operation 3-7 Welder circuit applications 3-7-1 Arc welders MCCBs installed in arc welder circuits should not inadvertently trip due to the massive inrush current generated at ignition. Inadvertent tripping often occurs when inrush current instantly trips the overcurrent tripping element in the MCCB.
  • Page 69 Selection and application 3-7 Welder circuit applications (i) Reviewing the thermal equivalent current (2) Selecting MCCBs With an on-load factor of 100%, the thermal equivalent current (a) Basic rule can be stated in equation form as Assuming that the welder is used in the operating condition illustrated in Fig.
  • Page 70 Selection and application 3-7 Welder circuit applications However, since the standard maximum input is prescribed Table 3-19 Spot welder circuit motor breaker selection for a resistance welder, even if the secondary circuit is fully Note: This table applies to models that can use a thyristor to perform phase control at startup for a synchronous or semi-synchronous system.

  • Page 71: Selecting An Mccb For Capacitor Circuit

    Selection and application 3-8 Selecting an MCCB for capacitor circuit 3-8 Selecting an MCCB for capacitor circuit (2) Transient inrush current when a circuit closes When a capacitor circuit like the one shown in Fig. 3-25 3-8-1 Characteristics specific to capacitor closes, the capacitor must be charged with an equivalent of circuits the voltage applied the instant the circuit closed.
  • Page 72 Selection and application 3-8 Selecting an MCCB for capacitor circuit If no reactors are connected in series with the capacitor, then (4) When capacitors are connected in parallel with the R, L, and C defined by the power supply transformer individual motor circuits to improve the power capacity, percentage impedance and capacitance will cause factor (See Fig.
  • Page 73 Selection and application 3-8 Selecting an MCCB for capacitor circuit Table 3-20 (1) MCCB rated current application examples for single-phase capacitor equipment capacity Rated frequency Rated voltage Rated equipment Rated current Capacitor rating Series reactor 6% MCCB rated MC type (Hz) capacity (kvar) current (A)
  • Page 74 Selection and application 3-8 Selecting an MCCB for capacitor circuit Table 3-20 (2) MCCB rated current application examples for three-phase capacitor equipment capacity Rated frequency Rated voltage Rated equipment Rated current Capacitor rating Series reactor 6% MCCB rated MC type (Hz) capacity (kvar) current (A)

  • Page 75: Mccbs For Semiconductor Circuit

    Selection and application 3-9 MCCBs for semiconductor circuit 3-9 MCCBs for semiconductor circuit 3-9-1 Faults and overcurrents in thyristor converters Circuits containing semiconductor devices such as thyristors and diodes differ in the following respects: The possible causes of overcurrents in thyristor converters can be broadly classified into two categories: internal faults the MCCB is installed in the circuit.

  • Page 76: Mccb Rated Current

    Selection and application 3-9 MCCBs for semiconductor circuit 3-9-2 MCCB rated current When an MCCB is used as a protective device, it is installed on the DC side. Hence, the location of the MCCB should be on either the AC or DC side. The current that flows through the determined with the importance of the load equipment and MCCB may differ depending on the side in which it is installed.

  • Page 77: Protecting Thyristors From Overcurrent

    Selection and application 3-9 MCCBs for semiconductor circuit Fig. 3-31 Coefficient for converting to effective values 3-9-3 Protecting thyristors from overcurrent The following methods are commonly used to protect semiconductor devices such as thyristors and diodes from Ieff= overcurrent: Direct protection Current-limiting fuses 2(2n-1) Circuit breakers...
  • Page 78 Selection and application 3-9 MCCBs for semiconductor circuit Any examination of the scheme of protection coordination (4) Use of MCCBs on the DC side of thyristors between MCCBs and devices should allow conversion of When MCCBs are installed on the DC side of a converter Fig. the device overcurrent immunity into effective values for 3-34, their primary duty will be interrupting the fault current comparison.

  • Page 79: Protecting Sscs Using Mccbs Or Mmss

    Selection and application 3-10 Protecting SSCs using MCCBs or MMSs 3-10 Protecting SSCs using MCCBs or MMSs When an MCCB is used to protect a solid-state contactor (SSC), protection over the entire range of its overload region to the short-circuit region would be difficult to achieve with an MCCB alone.

  • Page 80: Motor Circuits

    Selection and application 3-10 Protecting SSCs using MCCBs or MMSs 3-10-2 Motor circuits Table 3-24 shows various combinations that are available for motor circuit SSC control. Fig. 3-33 shows that a manual motor starter (MMS) protects regions A and B while a current-limiting fuse protects region C.

  • Page 81: Protecting Inverter Circuits Using Mccbs

    Selection and application 3-11 Protecting inverter circuits using MCCBs 3-11 Protecting inverter circuits using MCCBs 3-11-1 Inverter circuits Inverters usually rely on internal overcurrent protection. Therefore, the MCCB must protect the system up to the power supply terminal for the main circuit and must not inadvertently trip while the inverter is operating normally.

  • Page 82: Mccbs For High Frequency Circuits

    Selection and application 3-12 MCCBs for high frequency circuits Table 3-26 MCCBs for 400Hz circuits 3-12 MCCBs for high frequency circuits Specify 400Hz when ordering an MCCB for a 400Hz circuit. Hydraulic-magnetic type and solid-state trip type MCCBs Frame Type Icu (kA) cannot be used in 400Hz circuits because their characteristics Rated current...

  • Page 83: Mccbs For Dc Circuit Applications

    Selection and application 3-13 MCCBs for DC circuit applications 3-13 MCCBs for DC circuit applications Operating characteristic changes for DC circuit application While MCCBs are designed for an AC circuit, some may be Trip Inverse time-delay Instantaneous trip Operating device trip characteristic characteristics characteristic curve...
  • Page 84 Selection and application 3-13 MCCBs for DC circuit applications Table 3-27 Disconnect switches line up Rated voltage Frame size 250V BW32SAS BW50SAS BW63SAS BW100EAS BW125JAS BW250EAS BW400EAS BW630EAS BW800EAS BW125RAS BW250RAS BW630RAS 400V BW32SAS- BW50SAS BW63SAS BW100EAS 3P C4 -3P C4 -3P C4 -3P C4 500V ①...

  • Page 85: Mccbs For Ups Applications

    Selection and application 3-14 MCCBs for UPS applications 3-14 MCCBs for UPS applications Select an MCCB with 1.2 times the UPS (uninterrupted power supply) output, and use an MCCB with the same capacity at the input side. Consider the following points when selecting an MCCB.

  • Page 86: Mccbs For Servo Amplifier Applications

    Input power Output FALDIC- and - series FALDIC- series MCCB type ELCB (reference) supply [kW] type Three-phase 0.05 Standard series RYS500S3- Standard series RYB500S3-VBC BW32AAG-3P003 EW32SAG-3P003 230V 100V series RYB101S3-VBC RYS101S3- RYS201S3- RYB201S3-VBC BW32AAG-3P005 EW32EAG-3P005 RYB401S3-VBC BW32AAG-3P010 EW32EAG-3P010 RYS401S3- 0.75...

  • Page 87: Ground Fault Protection In System Applications

    Selection and application 3-16 Ground fault protection in system applications 3-16 Ground fault protection in system applications 3-16-1 Grounding methods and ground fault protection in system applications There are three possible grounding systems for low-voltage circuits: direct grounding, neutral point resistor grounding or no grounding at all. Direct grounding systems are widely used in Europe and the United States.
  • Page 88 Selection and application 3-16 Ground fault protection in system applications Table 3-31 Comparison of grounding system (TN, TT and IT systems) characteristics and precautions for their use Comparison Wiring system item TN-C TN-S TN-C-S Circuit diagram Features conductor functions for the overall conductor for the overall wiring system conductor functions for part of the wiring system are combined into a single...
  • Page 89 Selection and application 3-16 Ground fault protection in system applications Continued Comparison Wiring system item Circuit diagram Features to a ground electrode that is completely separate from the to a ground electrode that is completely separate from the power supply ground. power supply ground.
  • Page 91 Environment and usage precautions Chapter CONTENTS 4-1 Standard conditions ....................90 4-2 Application to special environments 4-2-1 High-temperature, high-humidity applications ..............91 4-2-2 Cold climate applications ....................91 4-2-3 High altitude applications .....................91 4-2-4 Application to special atmospheres ................92 4-3 Connection precautions 4-3-1 Reversed connection ....................93 4-3-2 Tightening torque ......................93 4-4 Malfunction due to transient inrush current ..........94...

  • Page 92: Standard Conditions

    Environment and usage precautions 4-1 Standard conditions 4-1 Standard conditions Because ambient conditions have a significant effect on the short-circuit and overload characteristics, durability, and insulating properties of circuit breakers, the conditions under which they are used must be clarified. For reference, Table 4-1 lists the standard operating conditions for FUJI MCCB performance.

  • Page 93: Environment And Usage Precautions

    Environment and usage precautions 4-2 Application to special environments 4-2 Application to special environments 4-2-3 High altitude applications Special care must be taken when using MCCBs at altitudes 4-2-1 High-temperature, high-humidity higher than 2000m because the lower air pressure (about applications 0.8atm at 2000m and about 0.5atm at 5500m) at higher altitudes reduces the cooling effect and dielectric strength of...

  • Page 94: Application To Special Atmospheres

    Environment and usage precautions 4-2 Application to special environments 4-2-4 Application to special atmospheres (1) Corrosive gas and salt (2) Others The contacts of MCCBs are generally made of silver or silver Table 4-5 shows special atmosphere problems and protective alloy that readily forms a sulfide film on contact with sulfurized measures.

  • Page 95: Connection Precautions

    Soldering must not be done when using a box-type terminal connection. Table 4-8 Breaking capacity for MCCB connected in reverse Model number Reverse connection breaking capacity [kA] (JIS C 8201-2-1 Ann. 2) 200V 400V BW32AAG – BW32SAG BW50AAG – BW50EAG BW50SAG BW50RAG...

  • Page 96: Malfunction Due To Transient Inrush Current

    Environment and usage precautions 4-4 Malfunction due to transient inrush current 4-4 Malfunction due to transient inrush current An MCCB may trip if the overcurrent detection device detects higher than normal transient current, like motor starting current or transformer exciting inrush current. One way to prevent this is to select an MCCB with instantaneous tripping characteristics higher than the motor starting current or transformer exciting inrush current.
  • Page 97 Maintenance inspections Chapter CONTENTS 5-1 Faults and causes ....................96 5-2 Periodic inspections 5-2-1 Initial inspection ......................98 5-2-2 Periodic inspections .....................98 5-2-3 Inspection following overcurrent tripping ..............99 5-3 Replacement recommendations 5-3-1 Recommendations for MCCB deterioration diagnosis and replacement ....100 5-3-2 Recommended replacement guidelines based on switching durability ......100...

  • Page 98: Faults And Causes

    Maintenance inspections 5-1 Faults and causes 5-1 Faults and causes Table 5-1 shows the appropriate countermeasure to take for faults that occur during MCCB operation. Table 5-1 Troubleshooting Type of fault Fault status or location Possible cause Countermeasure Abnormal Abnormally high terminal Tighten the screw.
  • Page 99 Maintenance inspections 5-1 Faults and causes Continued Type of fault Fault status or location Possible cause Countermeasure Faulty Faulty operation at higher than the Re-evaluate coordination or change the operation due specified operating current or with an upstream circuit breaker. selection.

  • Page 100: Periodic Inspections

    Maintenance inspections 5-2 Periodic inspections 5-2 Periodic inspections 5-2-1 Initial inspection When newly installed equipment first goes into operation, incorrect. This is why the items shown in Tables 5-2 and 5-3 there may be unexpected oversights or mistakes such that should be inspected before initial operation and again within screws were not properly tightened or cable connections were the following month.

  • Page 101: Inspection Following Overcurrent Tripping

    Maintenance inspections 5-2 Periodic inspections Table 5-5 Inspection procedures Inspection item Procedure Countermeasure 1. Presence or Inspect the surface of the MCCB and especially around the Vacuum up any dust, and wipe the area down with a dry, lint- absence of terminals on the power supply side to make sure no dust or oil free cloth.

  • Page 102: Replacement Recommendations

    Maintenance inspections 5-3 Replacement recommendations 5-3 Replacement recommendations An MCCB is generally thought to have exceeded its limit of economical by replacing the MCCB before it reaches one durability when any of the following occurs. of the three preceding conditions. This is true as long as the selected MCCB is the optimum choice (see Chapter 3) interruptions and is used under standard operating conditions (see 4-1,...
  • Page 103 Short-circuit current calculation Chapter CONTENTS 6-1 Calculating short-circuit current 6-1-1 Calculation objective ....................102 6-1-2 Calculation formula .....................102 6-1-3 Calculating short-circuit current for three-phase circuits ..........102 6-1-4 Impedance examples ....................104...

  • Page 104: Chapter 6 Short-Circuit Current Calculation

    Short-circuit current calculation 6-1 Calculating short-circuit current 6-1 Calculating short-circuit current values 6-1-1 Calculation objective (1) Reactance on the primary side of the The damage from a short-circuit fault in a system circuit must transformer: %X1 be kept to a minimum with power receiving equipment. This The reactance can usually be obtained from the power is why the short-circuit current generated when a fault occurs company.
  • Page 105 Short-circuit current calculation 6-1 Calculating short-circuit current Create an impedance map using the impedance calculated in step 2. Sources of short-circuit current like a power supply and motor constitute the same electric potential in an impedance map. Connect these sources together with an infinite busbar as shown in Fig.
  • Page 106 Short-circuit current calculation 6-1 Calculating short-circuit current 6-1-4 Impedance examples Table 6-1 Transformer impedance examples Transformer 3-phase transformer capacity (kVA) 6.3kV/210V 6.3kV/210V 20kV/420V 20kV/420V Oil immersed self-cooling Cast-resin Oil immersed self-cooling Cast-resin Impedance (%) Impedance (%) Impedance (%) Impedance (%) 2.27 4.12 1.94...
  • Page 107 Short-circuit current calculation 6-1 Calculating short-circuit current Table 6-3 Cable impedance examples (600V vinyl cable) Cable gauge Reactance per meter of cable ( ) Resistance per meter of cable ( ) Insulated wire or cable inside Copper tube cable or vinyl Indoor cable with insulator a steel tube or duct tube cable with no duct...

  • Page 108: Glossary

    Glossary Glossary An auxiliary switch which operates only upon the tripping of the circuit Alarm switch breaker with which it is associated. Ambient air temperature Temperature, determined under prescribed conditions, of the air surrounding the complete switching device or fuse. Anti-pumping device A device which prevents reclosing after a close-open operation as long as the device initiating closing is maintained in the position for closing.
  • Page 109 Glossary Glossary The conventional free-air thermal current is the maximum value of test current Conventional free-air thermal current to be used for temperature-rise tests of unenclosed equipment in free-air. The (Ith) value of the conventional free-air thermal current shall be at least equal to the maximum value of the rated operational current of the unenclosed equipment in eight-hour duty.
  • Page 110 Glossary Glossary An overcurrent relay or release (trip device) which operates after a time-delay Inverse time-delay overcurrent relay or inversely dependent upon the value of the overcurrent. release (trip device) NOTE: Such a relay or release (trip device) may be designed so that the time- delay approaches a definite minimum value for high values of overcurrent.
  • Page 111 Glossary Glossary Coordination of two or more overcurrent protective devices in series to ensure Overcurrent protective coordination overcurrent discrimination (selectivity) and/or backup protection. Overcurrent relay or release Relay or release (trip device) which causes a mechanical switching device to open with or without time-delay when the current in the relay or release (trip (trip device) device) exceeds a predetermined value.
  • Page 112 Glossary Glossary Breaking capacity for which prescribed conditions include a short-circuit at Short-circuit breaking capacity the terminals of the switching device. (Icn) Overcurrent resulting from a short-circuit due to a fault or an incorrect Short-circuit current connection in an electric circuit. Short-circuit making capacity Making capacity for which prescribed conditions include a short-circuit at the terminals of the switching device.
  • Page 114 Customers, who want to use the products introduced in this catalog for special systems or devices such as for atomic-energy control, aerospace use, medical use, passenger vehicle, and traffic control, are requested to consult with Fuji Electric FA. Customers are requested to prepare safety measures when they apply the products introduced in this catalog to such systems or facilities that will affect human lives or cause severe damage to property if the products become faulty.

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