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Appendix
B.1 Selectivity
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
343
●
No characteristics/trips are listed for fuses. The fuse types have the following operating
classes:
Type
Operating class
3NA
gL / gG
5SA1
"quick-response"
5SA2
"time-lag"
5SB1/3
"quick-response"
5SB2/4
"time-lag"
5SC1
"quick-response"
5SC2
"time-lag"
5SD4/5
gR
5SD6
"quick-response"
5SE2
gL / gG
●
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
Thermomagnetic trip unit
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
³ 100 ms
I
i
max.
Summary of Contents for SENTRON 3VL series
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Page 10: ...Table of contents 3VL molded case circuit breakers 10 System Manual 03 2009 110 0110 02 DS 01 ...
Page 350: ...Correction sheet 3VL molded case circuit breakers 350 System Manual 03 2009 110 0110 02 DS 01 ...
Page 358: ...Glossary 3VL molded case circuit breakers 358 System Manual 03 2009 110 0110 02 DS 01 ...
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