What this 3VA MCCB is and what it does
The Siemens 3VA1132-5GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) configured as a line-protection device with a TM220 thermal-magnetic overcurrent release. Its 4-pole design handles three-phase plus neutral, with 100% N-conductor protection — meaning the neutral pole is fully rated alongside the phase poles, not reduced. Rated 32 A continuous at 40 °C ambient, it holds that rating through 50 °C and only starts to derate above 55 °C — 31 A at 55 °C, 30 A at 70 °C. That thermal headroom means it can sit in a warm enclosure without losing capacity until you're well above normal panel ambient. Interrupting capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. Those numbers cover high-fault industrial services — a 187 kA SCCR at 240 V means it can safely clear a bolted fault on a large step-down transformer secondary without upstream coordination issues.
Panel fit and integration
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — a standard 4-pole MCCB width for DIN-rail or screw-mount panel layouts. Front IP40 protection keeps out tool drops and dust during installation; the rear and sides are open to the enclosure air for convection cooling. No undervoltage release, no shunt trip, no communication module — this is a basic thermal-magnetic breaker for straightforward line protection. Power loss is 10.6 W maximum at rated load, which factors into enclosure thermal calculations if you're stacking several breakers.