What it is and what the ratings mean
The SENTRON 3VM1132-4GE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a TM220 thermal-magnetic release and a continuous current rating of 32 A that holds flat from 40 °C to 50 °C, then derates only 1 A per 5 °C step up to 70 °C — so in a warm panel you still get 30 A at 65 °C. The breaking capacities tell the real story: 121 kA at 240 V AC, 76 kA at 415 V, 53 kA at 440 V, and 11.9 kA at 500 V. That 121 kA figure is what you need for high-fault utility feeds or transformer secondaries; the 76 kA at 415 V covers most European industrial distribution.
Integration and panel fit
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that drops into most DIN-rail or panel-mount enclosures without re-drilling. Front IP40 keeps dust out of the handle and trip-indicator area; the rest of the body is open to the cabinet environment. Maximum power loss is 10.6 W, so ventilation in a sealed enclosure is manageable — no forced cooling required for a single unit, but stack several in a row and account for the cumulative heat.