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Remote tripping

Shunt Trip (SHT) or Under Voltage Release (UVR/UVRN).

Shunt Trip (SHT)

·This release trips the circuit breaker when the control voltage rises above 0.7 x Un
·Control signals can be of the impulse type (u 20 ms) or maintained.

Under Voltage Release (UVR/UVRN)

• This release trips the circuit breaker when the control voltage drops below a tripping threshold

• Tripping threshold between 0.35 and 0.7 times the rated voltage

• Circuit breaker closing is possible only if the voltage exceeds 0.85 times the rated voltage.

Operation

When the circuit breaker has been tripped by an SHT or UVR/UVRN release, it must be reset locally:

• SHT or UVR/UVRN tripping takes priority over manual closing

• in the presence of a standing trip order, closing of the contacts, even temporary, is not possible.

Circuit breaker tripping by an SHT/UVR/UVRN release meets the requirements of standard IEC 60947-2.