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Specifications
Pickup:
1.5-12.0A in 0.25 amp increments.
0.3-2.4A in 0.05 amp increments.
Instantaneous: 1-20 times
pickup in 0.1 increments
For other ranges, consult factory.
Accuracy:
Time pickup
Curves:
Switch selectable on front panel:
Inverse
Very Inverse
Extremely Inverse
Short Time
Time Dial - adjustable 1-10
in increments of 0.1
Accuracy:
greater
Burden:
1.5-12A unit: 2.8 VA at 5A (non-linear,
see IB)
0.3-2.4A unit: 2.8 VA at 1A (non-linear,
see IB)
Output Contact Rating:
30 amperes tripping at 250 Vdc
5 amperes continuous
0.3 amperes break inductive at 125 Vdc
Series Target
Coil Rating:
30 Amp Tripping (1 amp minimum
trip circuit current req'd. to set targets)
For trip circuit currents below 1 amp, .25
amps minimum, add "_ST" to catalog number
for sensitive target coil.
Operating Frequency:
50 Hz or 60 Hz, selectable by internal jumper
Control Power Drain:
Zero. Unit is self-powered
Temperature Range:
Minus 20°C to Plus 70°C
Transient Immunity:
More than 2500V, 1 MHz bursts at 400 Hz
repetition rate continuous (ASNSI C37.90.1
SWC); Fast transient test; EMI test.
Dielectric:
2000 Vac, 60 seconds
all circuits to ground
Weight: Micro-51
Unboxed: 4.7 Ibs. (2.1 kg)
Boxed: 5.4 Ibs. (2.3 kg)
Unboxed: 7.8 Ibs. (3.5 kg)
Micro-511FT
Boxed: 9.6 Ibs. (4.4 kg)
Volume: Micro-51
0.26 cubic feet
Micro-511FT
0.48 cubic feet
August, 1991
3%; Inst. pickup
10%
±
±
Definite Time
Long Time Inverse
Long Time Very Inverse
Long Time Ext. Inverse
7% or
1 cycle whichever is
±
±
Testing
Conventional overcurrent relay test procedures
using commercially available test sets may be
used.
How To Order
For a complete listing of available overcurrent
relays see TO 41-025.
To place an order or for further information,
contact the nearest District Office.
How To Specify
Time overcurrent relays shall be Asea Brown
Boveri Type Micro-51 Series. Relay shall be
microprocessor based with eight selectable
curves, self-powered, self-checking, and of
total drawout construction.
Further Information
List Prices: PL 41-020
Technical Data: TO 41-025
Instruction Book: IB 7.2.1.7-15<D
Test Plug: IB 7.7.1.7-8<D
Other Protective Relays:
Application Selector Guide, TO 41-016
CD
Available upon request, only from Allentown Plant.
Descriptive Bulletin
41-123M
Page 3
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