The Siemens 3VA1132-3EF32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for 32 A continuous current (Iu) across a 3-pole configuration. It carries a TM240 thermal-magnetic overcurrent release, meaning the fixed thermal trip element and magnetic short-circuit response are matched to the 32 A frame — no interchangeable trip unit to swap out later. The interrupting capacity follows a steep voltage curve: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. That 52.5 kA at 415 V is the number most panel builders will check first for a 400 V distribution board.
Thermal derating and panel fit
The 3VA1132-3EF32-0KH0 holds its full 32 A rating up to 50 °C ambient. Above that it steps down: 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 the panel ambient runs above 50 °C — common in a sealed enclosure near a furnace line or a solar combiner — size the load side for the derated figure, not the nameplate 32 A. The physical footprint is 70 mm deep by 76.2 mm wide by 130 mm tall, which fits the standard SENTRON 3VA mounting footprint; no extra DIN-rail adapter needed. Front face carries an IP40 rating, so it is protected against tools and wires >1 mm but not against water ingress — keep it inside the enclosure.
Auxiliary contacts and shunt trip
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). That gives you one N/O + one N/C auxiliary mirroring the main contacts, and a separate alarm contact that changes state only when the breaker trips on fault — useful for remote fault annunciation without wiring through the aux contacts. The integrated shunt trip (STL) release is order code 3VA9688-0BL33; it is a voltage-trigger accessory that lets a remote signal (PLC digital out, emergency-stop relay) force the breaker open. No undervoltage release, no ground-fault monitoring, no communication module on this variant — it is a straight line-protection MCCB with remote trip capability.