What it is and what it does
The Siemens SENTRON 3VA1132-5MH32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 32 A at 40 °C, designed specifically for starter protection — meaning it's built to handle the inrush and overload profile of motor starters and contactor combinations, not just general distribution loads. Its TM120M thermal-magnetic release provides fixed thermal protection (overload) and fixed magnetic (short-circuit) trip, with no adjustable settings — a deliberate choice for applications where the trip curve is known and must stay locked. Rated insulation voltage is 800 V, and the breaker delivers a short-circuit breaking capacity of 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V — high enough to handle most industrial fault levels without cascading upstream.
Where it fits — panel and environment
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or base-mount panel layouts without re-drilling. Front face is rated IP40, so it's protected against tools and small solids but not washdown — install in a clean, dry enclosure or a cabinet with a door seal. Operating temperature range is -25 °C to 70 °C; storage range -40 °C to 80 °C. Maximum power loss is 10.6 W — negligible for thermal budgeting in a standard panel.