Installing/mounting
6.2 Mounting and safety clearances
3VL IEC molded case circuit breakers
80 System Manual, 11/2013, 110 0110 - 02 DS 03
Mounting and safety clearances
Permissible mounting positions
All 3VL molded case circuit breakers can be mounted in the positions shown:
There is a separate mounting assembly for VL800 to VL1600 molded case
circuit breakers with guide frame in lateral installation position.
Use of the internal accessories possible
Permissible current load factor 0.9
Not allowed: motorized operating mechanisms, rotary operating
mechanisms, plug-in assembly / withdrawable assembly
During a short-circuit interruption, high temperatures, ionized gases and high pressures
occur in and above the arcing chambers of the molded case circuit breaker.
Safety clearances are required to:
● allow pressure distribution
● prevent fire or damage caused by any diffused ionized gases
● prevent a short circuit to grounded parts
● prevent arcing or short-circuit currents to live sections
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