Siemens SENTRON 3VA1150-5EF36-0HC0 — 50 A MCCB with 187 kA interrupting capacity
The Siemens SENTRON 3VA1150-5EF36-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 50 A across its full temperature range from 40 °C to 50 °C, derating to 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — figures that govern selectivity coordination in high-fault-current panels, not just the breaker's own withstand. The overcurrent release is a TM240 thermal-magnetic type, and the auxiliary release is a shunt trip (STL) with integrated auxiliary trip order code 3VA9688-0BL30. Two auxiliary switches (HQ version) are fitted as standard; there is no undervoltage release, no communication function, no phase failure detection, and no ground fault monitoring — this is a straightforward line-protection breaker without add-on electronics. The front face carries IP40 protection, and the unit is designed to mount in a standard panel or enclosure with a 70 mm depth, 76.2 mm width, and 130 mm height.
Integration and deployment
The 3VA1150-5EF36-0HC0 fits into a standard panel cutout for SENTRON 3VA frame sizes; the 76.2 mm width matches the 3-pole footprint common across the series, so a panel designed for a 3VA1110 variant will accept this unit without rewiring, provided the busbar and lug kit accommodate the 50 A rating. The shunt trip (STL) auxiliary release allows remote tripping via a control voltage, which is typical for emergency-stop or supervisory shutdown circuits in industrial control panels. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so the breaker can be warehoused in unconditioned spaces but must be commissioned within the operating limits.