Description
2.5 Standards and guidelines
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
67
Recommended maximum clearance for 3VA2 molded case circuit breakers:
2.5.7
Arcing spaces
Adequate arcing spaces must be taken into account during planning and installation of the
molded case circuit breakers.
In particular, the following must be observed:
●
Ventilation openings must be kept free.
●
Ionized gases must not be routed in the direction of connecting terminals or non-insulated
busbars.
●
Arcing spaces must not be blocked by busbars installed too close to one another or by
other objects.
The 3VA molded case circuit breakers up to size 630 A have a rotary double-contact system
and therefore blow out upwards and downwards. The upper blowout openings (at
terminals 1, 3, 5) are located above the connections and the lower blowout openings (at
terminals 2, 4, 6) are located below them.
The 3VA molded case circuit breakers in size 1000 A (3VA25) only blow upwards, i.e. in the
direction of terminals 1, 3, 5, as they have a single-contact system.
