Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
52 System Manual, 11/2013, 110 0110 - 02 DS 03
Note
ETU with communication 3-pole (3VL_7__-_M*) or 4-pole (3VL_7__-_N*)
If a communication
-capable ETU is used, the left-hand accessory compartment X2 contains
an auxiliary switch and an alarm switch.
Note
Max. no. of contact blocks
Maximum 6
contact blocks (HS) per molded case circuit breaker VL160X to VL400
contact blocks (HS) per molded case circuit breaker VL630 to VL1600
Undervoltage release
Molded case circuit breaker with undervoltage release
If there is no voltage present, closing of the molded case circuit breaker is not possible. If
voltage is not applied to the releases, operation of the circuit breaker will result in no-load
switching.
The undervoltage release trips the molded
case circuit breaker when the voltage
fails.
Tripping can occur within a voltage range of
0.7 to 0.35
x U
S
. Tripping occurs under
x U
S
. Re-closure of the molded case
circuit breaker contacts is only possible once
the voltage has reached a value of 0.85 to
1.1
x U
S
. Undervoltage releases can be
installed for electronic locking.
Undervoltage releases are installed in the right accessory compartment of the 3VL molded
case circuit breakers.
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