ABB REF 545 Product Guide

Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG
26
Residual overvoltage protection, high-set stage, ROV1High, Uo>> (59N-2), and instantaneous
stage, ROV1Inst, Uo>>> (59N-3)
Start voltage
Operate time
Operation mode
Measuring mode
2.0…100.0% of Un
0.05…300.00 s
Not in use
Definite time
Peak-to-peak
Fundamental frequency
Operation accuracy
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.01 x Un
Injected voltages >2 x start voltage:
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.95
Total time for blocking: < 25 ms
Total time when voltage drops below start value: < 50 ms
±2% of set value or ±20 ms
Three-phase thermal overload protection for cables, TOL3Cab, 3Ith> (49F)
Time constant for the cable
Maximum load current for the cable
Maximum temperature of conductor
Reference temperature
Trip temperature
Prior alarm temperature
Reclosure temperature
Ambient temperature
Operation mode (principle of ambient
temperature compensation)
1…999 min
1.0…5000.0 A
40.0…150.0C
-50.0…100.0C
80.0…120.0%
40.0…100.0%
40.0…100.0%
-50.0…100.0C
Not in use
No sensors; the set ambient temperature
1 sensor used
2 sensors used
Operation accuracy
Reset ratio
Note! The values below apply when f/fn = 0.95...1.05
±1.0%, I = 0.1...10.0 x In
Trip: (Calculated temp. rise - 0.1) / Trip temperature
Start: (Calculated temp. rise - 0.1) / Prior alarm
temperature

ABB REF 545 Specifications

General

Brand	ABB
Model	REF 545
Category	Touch terminals
Language	English