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Functions
5.1 Current protection
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
43
2. Overcurrent trip unit of the SENTRON VL160 to VL1600 circuit breakers, electronic, ETU / LCD-
ETU
The electronic overcurrent tripping system consists of:
●
current transformers
●
Evaluation electronics with microprocessor
●
Tripping solenoid
No auxiliary power supply is necessary for the tripping system.
Activation of the microprocessor trip unit requires a minimum load current of approximately
20% of the relevant rated current I
n
of the circuit breaker.
At the output of the electronic overcurrent trip unit, there is a tripping solenoid that releases
the circuit breaker in the event of an overload or short-circuit.
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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