7SR18 Performance Specification
3.2
50BF Circuit Breaker Fail
3.2.1
Reference
Parameter
Is
Setting
I4
Setting
t
Stage 1 Delay setting
CBF1
t
Stage 2 Delay setting
CBF2
3.2.2
Operate and Reset Level
Attribute
I
Operate level
op
I
Reset level
reset
Repeatability
Variation
3.2.3
Operate and Reset Time
Attribute
Stage 1
t
op
Stage 2
Repeatability
Overshoot
Disengaging time
Unrestricted Page 40 of 44
-10 °C to +55 °C
f
± 5 %
nom
Value
0.050, 0.055... 2.0 xIn
0.050, 0.055... 2.0 xIn
20, 25... 60000 ms
20, 25... 60000 ms
Value
100 % Is, ± 5 % or ± 1 % In
<100 % I
, ± 5 % or ± 1 % In
op
± 1 %
£ 5 %
£ 5 %
Value
, ± 1 % or ± 20 ms
t
CBF1
, ± 1 % or ± 20 ms
t
CBF2
± 1 % or ± 20 ms
< 2 x 20 ms
< 20 ms
©2018 Siemens Protection Devices Limited