What this MCCB is and what it does
The Siemens 3VA1132-4EF36-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in industrial distribution panels. It is rated for 32 A continuous current at 40 °C and delivers a breaking capacity of 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that tell you it can safely interrupt high-fault currents in low-voltage switchgear without upstream coordination issues. The insulation voltage is rated 800 V, so it handles 480/600 V class systems comfortably. This is a 3-pole unit with a thermal-magnetic overcurrent release (TM240) and a built-in shunt trip release (STL) for remote tripping — no undervoltage release, no ground-fault monitoring, no communication module. The shunt trip means you can wire an emergency-stop or PLC-driven signal directly to the breaker for controlled disconnection. Power loss is 10.6 W maximum, which matters for enclosure thermal calculations.
Dimensions and panel fit
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high. That 76.2 mm width — exactly 3 inches — matches the standard MCCB footprint for a 3-pole unit. It mounts on a DIN rail or directly to a backplate; the depth leaves room for rear-access terminals in a typical 200 mm deep enclosure.