3.2 Electromechanical accessories
3.2.1 Auxiliary releases for 3VA27 / 3WL10
① Closing coil (CC) (for breaker with stored energy operating mechanism only)
② Undervoltage release (UVR) / shunt release (ST2)
③ Shunt release (ST)
Undervoltage release (UVR)
The undervoltage release trips the circuit breaker if the rated control supply voltage U
s
fails or
drops to between 70% and 35% of its normal value (in compliance with the relevant standard).
The undervoltage release can be used for:
• Safe remote-controlled tripping
• Interlocking during closure
• Checking the voltage in the primary and secondary circuits
The undervoltage release is powered via the auxiliary conductor terminal system.
Note
The circuit breaker can be reclosed at a coil supply voltage of 85% to 110%U
n
.
Accessories
3.2Electromechanical accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
94 Equipment Manual, 10/2023, L1V30499596002-03
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