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)
When the circuit breaker has been tripped by an SHT or UVR/UVRN release, it must be reset locally:
Circuit breaker tripping by an SHT/UVR/UVRN release meets the requirements of standard IEC 60947-2.
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