The Siemens 3VA1150-6EF32-0HA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection — 3-pole, 50 A continuous at 40 °C, with a shunt trip (STL) auxiliary release built in. It interrupts up to 220 kA at 240 V, which covers high-fault utility feeds and transformer secondaries without cascading upstream breakers. The TM240 thermal-magnetic trip unit handles overload and short-circuit in one package; no external relay needed.
Interrupting capacity and thermal curve
Interrupting ratings drop as voltage rises: 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That 17 kA floor at 690 V still covers most industrial motor branch circuits. The thermal derating is mild — 50 A holds from 40 °C to 50 °C, then steps down to 45 A at 70 °C. Rated insulation voltage is 800 V, so this breaker fits 480 V and 600 V class panels with headroom.
Panel fit and integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard MCCB footprint for a 3-pole frame. The shunt trip release (STL) allows remote tripping from an emergency-stop or safety circuit. No communication function on this variant; it's a straight thermal-magnetic breaker with undervoltage release absent. The basic switch is order code 3VA11506EF320AA0.