What this MCCB carries — and what it means for the panel
The SENTRON 3VM1132-5EE32-0AA0 is a 3-pole molded case circuit breaker rated 320 A continuous, with a TM220 thermal-magnetic overcurrent release. That TM220 designation means the thermal element is fixed at the frame rating and the magnetic trip is adjustable — you set the short-circuit pickup to match the downstream cable or load, not the other way around. The interrupting capacity is 187 kA at 240 V AC, dropping to 121 kA at 415 V and 76 kA at 440 V, so it handles high-fault utility feeds or transformer secondaries without cascading upstream. Rated insulation voltage is 800 V, which covers 480/277 V and 600 V systems with headroom. Thermal derating is flat from 40 °C to 50 °C at 32 A, then drops only 1 A per 5 °C step through 70 °C. That means a panel running at 55 °C ambient still delivers 31 A — no need to oversize the frame for a warm enclosure. The front face carries IP40 protection, so incidental tool contact or dust ingress is blocked, but the body is not sealed for washdown.
Mounting and integration — fits the standard DIN-rail footprint
The breaker measures 70 mm deep by 76.2 mm wide by 130 mm high — a standard 3-pole MCCB footprint that clips onto a DIN rail or mounts directly to a backplate. At 76.2 mm wide, it occupies three modular 25.4 mm positions, so you can plan the gland plate and wireway fill before the panel arrives. Maximum power loss is 11 W, which is low enough that natural convection in a typical enclosure handles the heat without forced air.