Siemens 7UG0861-1BU20 Operating Instructions

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Earth Fault Monitoring Relays
7UG0861-1BU20
Technical Data
Designation
Type
Control voltage
Operating temperature
Trip modes
Trip Time delay
Power consumption
7UG0861...
Terminal connections
MLFB
7UG09910 Core Balance CT 160 A, 3P
7UG09911 Core Balance CT 160 A, 4P
7UG09912 Core Balance CT 250 A, 3P
Core Balance CT 250 A, 4P
7UG09913
7UG09914 Core Balance CT 630 A, 3P
7UG09915 Core Balance CT 630 A, 4P
7UG0861-1BU20
Earth Fault relay
85 - 270V AC/DC
0 to 50°C
Fault current: 10%-80% of rated current
CBCT current ranges:
- 160A
- 250A
- 630A
0 - 99.9 sec
4VA
Control
Voltage
Type
Operating Instructions
Please read and understand these instructions before installing,
operating, or maintaining the equipment.
DANGER
Hazardous voltage can cause death or serious injury.
Disconnect power before working on equipment.
CAUTION
Reliable functioning of the equipment is only ensured
with certified components.
Overvoltage category II
(Refer IEC 60947-1)
NOTICE
This product has been designed for environment A. Use of this product
in environment B may cause unwanted electromagnetic disturbances in
which case the user may require to take adequate mitigation measures.
LED Indication Chart
Various condition
No Fault
Pre-Alarm
Fault / Trip
Note:
7UG0991.CBCT (Core Balanced Current Transformer) is an
accessory to be used with 7UG0861... (Earth Fault relay)
For single phase applications, only the live and neutral needs
to be passed through the CBCT.
For 3 Phase 3 wire system, pass L1, L2, L3 through CBCT.
For 3 Phase 4 wire system pass L1, L2, L3 and N through
CBCT.
The Earth MUST NOT pass through the CBCT.
The distance between relay and CBCT should be kept as short
as possible
Use Screen, shielded cable or twisted pair cable between the
unit and CBCT for long distance (Greater than 1m).
Solid
Stranded with end sleeve
7UG0
IEC 60947-5-1
IEC 60947-4-1
'R1' LED 'R2' LED
OFF OFF
OFF ON
ON ON
7UG08... / 7UG09..
0.5 Nm / 0.4 Nm
1 x (0.75 to 2.5) mm
2
2 x 0.5 to 2 x 1.5 mm
2
1 x (0.5 to 2.5) mm
2
2 x (0.5 to 1.5) mm
2
1