The Siemens 3VM1450-4GE42-0AA0 is a 4-pole molded case circuit breaker from the SENTRON 3VM1 family, IEC frame 630, rated 500 A continuous with a TM220 ATFM thermal-magnetic trip unit. The TM220 trip gives you adjustable overload protection (Ir = 350 A to 500 A) and a fixed short-circuit pickup of 10 × In (5,000 A), plus integral N-conductor protection.
The adjustable Ir band (350-500 A) lets you match the breaker to the actual load without swapping trip units — set it via the dial on the front face. The fixed Ii = 10 × In gives a flat short-circuit pickup; if your system needs selectivity with downstream breakers, verify the instantaneous threshold against the let-through of the next device. N-conductor protection is integral, so no separate neutral protection module is needed on a 4-wire system. The 100% nut keeper kit is included for secure busbar connections.
