Siemens SENTRON 3VL series - Appendix; Table of Abbreviations; A.1 Table of Abbreviations

3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
307
Appendix
A
A.1
Table of abbreviations
Explanation of the abbreviations
Abbreviation
Explanation
line
for line protection
motor
for motor protection
starter
for starter combinations
insulation circuit breaker
Switch disconnectors
I
R
Current value of the overload release
I
sd
Current value of the short-time delayed short-circuit release
t
sd
Delay time of the short-time delayed short-circuit release
I
i
Current value of the instantaneous short-circuit release
I
cn
Rated short-circuit breaking capacity
TM
Thermal-magnetic release
ETU
Electronic trip unit
Settings of the LI and LSI releases of the upstream and downstream protective devices for
calculating the selectivity limits:
I
R
1 x I
r
I
sd
max.
t
sd
100 ms
I
i
max.