What this MCCB delivers — and where the ratings matter
The SENTRON 3VA1150-4EF36-0KC0 is a 3-pole molded case circuit breaker rated for 50 A continuous current (Iu) with a TM240 thermal-magnetic release. Its breaking capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — figures that govern its selectivity and SCCR coordination in a distribution panel. The rated insulation voltage (Ui) is 800 V, so the breaker is electrically rated for 690 V line-to-line systems with margin. Thermal derating is published per the datasheet: the breaker holds 50 A from 40 °C through 50 °C, then steps down to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be trimmed accordingly — the curve is the binding limit, not the nameplate 50 A. The front face carries IP40 protection — sufficient for a clean indoor panel, but not for washdown or dust-exposed locations. The breaker ships with a factory-fitted shunt trip (STL) release (order code 3VA9688-0BL33) and two HQ auxiliary switches, so it arrives ready for remote tripping and status feedback without a separate accessory order.
Panel fit and integration
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth. The 76.2 mm width matches the standard SENTRON 3VA footprint for a 3-pole frame. The TM240 release is a fixed thermal-magnetic design — no interchangeable trip unit, no communication module, no phase-failure detection. It is a line-protection breaker, not a motor-protection or ground-fault device. The auxiliary contacts (2 HQ switches) and the shunt trip are integrated at the factory, so no field wiring of separate accessory kits is needed beyond connecting the trip coil circuit.