What this MCCB delivers — and where the ratings matter
The Siemens 3VA1132-5EF32-0AC0 is a 3-pole SENTRON molded case circuit breaker rated for 32 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. The TM240 release means the thermal element is fixed at 32 A — no field adjustment on the continuous amp rating — so what you spec is what you get, no dial to bump during commissioning. The magnetic trip threshold is set at the factory for the 32 A frame, giving short-circuit protection coordinated to that rating. Breaking capacity is the headline here: 187 kA at 240 V AC, 121 kA at 415 V AC, 75.6 kA at 440 V AC, and 17 kA at 690 V AC. That 187 kA at 240 V puts it squarely in the high-interrupting category for North American 240 V distribution — think large transformer secondaries or bus-duct feeds where fault current runs high. At 415 V, the 121 kA covers most industrial main and sub-main applications across Europe and Asia without needing a current-limiting upstream device. The 17 kA at 690 V is still respectable for 690 V motor control centers, though you'd check coordination with the upstream fuse or breaker. Thermal derating is published across the full operating range: full 32 A holds from 40 °C through 50 °C, then drops to 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. If this breaker lives in a non-ventilated enclosure near other heat sources, that 55 °C derating curve is the one to design against — not the 40 °C number.
Panel fit and integration
Footprint is 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB envelope that drops into most SENTRON distribution panels and switchboard chassis without re-drilling. IP40 on the front means it's protected against tools and wires >1 mm, but not sealed against dust ingress; keep it inside an enclosure rated for the environment. Comes with 2 auxiliary switches (HQ type) built in — no separate add-on module needed for status feedback to the PLC or SCADA. No undervoltage release, no shunt trip, no ground-fault monitoring on this variant, so if those are required, the panel design needs the external accessories or a different order-code suffix.