Functions
5.2 Voltage protection
3VL molded-case circuit breakers
60 System Manual, 03/2009, 110 0110 - 02 DS 01
5.2 Voltage protection
5.2.1 Undervoltage release
As an undervoltage release, the circuit breaker can protect certain electrical components when the
voltage falls below a given level.
Undervoltage release
The undervoltage release trips the circuit
breaker when the voltage fails or falls to an
operating level between 70 and 35% x U
S
.
Re-closure of the circuit breaker contacts is
only possible once the voltage has reached
a value of at least 85% x U
S
. Undervoltage
releases can be installed for electronic
locking.
Undervoltage releases are installed in the right accessory compartment of the SENTRON VL
circuit breakers.
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