630A Frame, 36kA Breaking — What That Means for the Panel
The Siemens 3VA1450-4EF42-0AA0-ZD00 is a 4-pole IEC molded-case circuit breaker on the 630A frame, rated for a 36kA interrupting capacity at 415VAC — that's breaking capacity class S, meaning it clears high-fault currents without upstream damage in a standard industrial distribution panel. Overload protection is set via the TM240 ATAM trip unit: In=500A, with an adjustable Ir from 350A to 500A. Short-circuit magnetic pickup Ii is adjustable from 5 to 10 times In, so you can dial in selectivity with downstream breakers without sacrificing speed on a hard fault.
Panel Integration & Fit
The 630A frame takes up the same footprint as other 3VA1 breakers in this class, so swap-in for a failed unit is straightforward — no re-drilling the backplate. The TM240 ATAM trip is thermal-magnetic, not electronic — no auxiliary power needed for the trip unit, and no nuisance tripping from harmonics on a VFD line. That's a plus for field-service techs who want a breaker that just works without programming.