What this MCCB does and where it fits
The Siemens 3VA1150-6EF36-0HC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection — meaning it sits at the incoming feeder or main distribution point in a panel, not on a motor branch. Its TM240 thermal-magnetic release provides fixed overload and short-circuit protection without the need for an external trip unit. The 50 A continuous rating holds flat from 40 °C through 50 °C, then derates to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — so in a hot enclosure you lose 5 A by the time ambient hits 70 °C. Interrupting capacity is 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V; that 220 kA figure at 240 V means it can clear a fault on a high-capacity transformer secondary without upstream fuses, but at 690 V the 17 kA limit is the binding number for a 690 V line — verify your available fault current is below that. The front face carries an IP40 rating, so it's protected against tools and wires >1 mm but not against moisture; mount it in a dry enclosure. No undervoltage release, no phase-failure detection, no communication function — this is a straight thermal-magnetic breaker with a shunt trip (STL) and two auxiliary switches (HQ) built in.
Integration and mounting
The breaker measures 76.2 mm wide, 130 mm high, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. The 70 mm depth is the dimension from the mounting surface to the back of the breaker; allow clearance for the shunt trip and auxiliary switch wiring on the side. The TM240 release is fixed, so no field-adjustable trip settings — you select the breaker for the load and leave it. The two auxiliary switches (HQ) provide status feedback for the panel PLC or remote monitoring.