7SR105 Rho Performance Specification
© 2018 Siemens Protection Devices Chapter 3 Page 16 of 17
Table 1-26 50 BF Circuit Breaker Fail
Operation Current check - Phase and Measured Earth with
independent settings Mechanical Trip
CB Faulty Monitor
Setting Range I
s
0.05,0.055…2.0xI
n
Setting Range I
s
0.01,0.015,...2.0xI
n
2 Stage Time Delays Timer 1 20…60000 ms
Timer 2 20…60000 ms
Operate Level 100 % I
s
, ± 5 % or ± 1 % xI
n
Disengaging time < 20 ms
Operate time following delay Tcbf ± 1 % or ± 20 ms
Triggered by Any function mapped as trip contact
Inhibited by Binary/Virtual Input
Timer By pass Yes, 50BF CB Faulty Input
Table 1-27 Temperature Inputs
Temperature input type
(Temperature Coefficient Resistance based on
DIN/IEC 60751 standard)
Cu10 (0.00427),
Ni100 (0.00618),
Pt100 (0.00385),
Ni120 (0.00672),
Pt250 (0.00385),
Ni250 (0.00618), and
Pt1000 (0.00385)
Temperature input Alarm 0,1,2...250 ºC
Temperature input Trip 0,1,2...250 ºC
Operate value 100 % T
set
, ± 2 % or ±2 ºC,
For Cu10: ± 2 % or ± 5 ºC
Response time < 3 s
Sensing current < 0.5 mA
Maximum lead resistance 25 Ω/lead
For Cu10: 2.5 Ω/lead
Table 1-28 74 T/CCS Trip/Close Circuit Supervision
Number of supervisable circuits 3 x Trip and 3 x Close
Number of BI’s Required 1 or 2 per function
Table 1-29 50BCL Break Capacity Limit
Setting
1.0, 1.5… 50xI
n
Operate level 100 % I
s
, ± 5 % or ± 1 % I
n
Reset level
≥ 95 % Iop
Element basic operate time 0 to 2xI
s
: 20 ms or ± 10 ms
0 to 5xI
s
: 15 ms or ± 10 ms
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