Description
2.4 Electronic trip unit ETU
Air circuit breaker 3WL10
48
Manual, 11/2017, L1V30499596002-01
Basic rules for setting different trip parameters
The settings selected for the trip unit of a circuit breaker depend on the technical
environment (e.g. switchboard and applications) and the type of equipment to be protected.
It is the responsibility of the system planner to calculate and dimension the protection
settings in accordance with the valid rules.
The following diagram shows the tripping characteristics of the 3WL10 circuit breaker.
①
Setting value of the long-time-delayed protection
②
Delay time of the long-time-delayed protection
③
Switchover of the overload characteristic (I
4
t and VI, SI, EI)
④
Setting value of the short-time-delayed protection
⑤
I
2
t characteristic ON/OFF of the short-time-delayed protection
⑥
Delay time of the short-time-delayed protection
⑦
Setting value of the instantaneous protection
⑧
Setting value of the ground-fault protection
⑨
Switchover to the I²t characteristic of the ground-fault protection
LT
Overload range
ST
Short-time-delayed short-circuit protection range
INST
Instantaneous short-circuit protection range
GF
Ground-fault protection
Summary of Contents for SENTRON 3WL10
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Page 8: ...Table of contents Air circuit breaker 3WL10 6 Manual 11 2017 L1V30499596002 01 ...
Page 170: ...Operation 6 3 Troubleshooting Air circuit breaker 3WL10 168 Manual 11 2017 L1V30499596002 01 ...
Page 180: ...Technical specifications Air circuit breaker 3WL10 178 Manual 11 2017 L1V30499596002 01 ...
Page 199: ...Air circuit breaker 3WL10 Manual 11 2017 L1V30499596002 01 197 Circuit diagrams 10 ...
Page 212: ...Circuit diagrams Air circuit breaker 3WL10 210 Manual 11 2017 L1V30499596002 01 ...
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