What the interrupting ratings mean for your panel
The Siemens 3VA1150-5EF36-0HA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. Its 3-pole design carries a rated continuous current Iu of 50 A at 40 °C through 50 °C, derating to 45 A at 70 °C. The interrupting capacity is the headline spec here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA at 240 V means this breaker can safely clear a fault of that magnitude without rupturing — critical for high-fault-current service-entrance or industrial feeder applications where the available short-circuit current is substantial. The TM240 overcurrent release provides thermal-magnetic protection; the shunt trip (STL) design allows remote tripping via a separate control signal, with the integrated auxiliary trip specified as 3VA9688-0BL30.
Panel integration and mounting
The 3VA1150-5EF36-0HA0 mounts on a DIN rail or can be screw-fixed to a backplate. Dimensions are 70 mm deep by 76.2 mm wide by 130 mm tall — a standard 3-pole MCCB footprint that fits most SENTRON distribution panels and retrofit slots. IP40 on the front means protection against tools and small wires entering the enclosure face; the rear and sides are not sealed, so the breaker should be installed inside a panel with a higher overall IP rating if washdown or dust ingress is a concern.
Selectivity and coordination considerations
For an MRO planner or site electrical engineer evaluating this breaker for a line-down spare: the 50 A rating and high interrupting capacity (187 kA at 240 V) make it suitable for main or feeder duty where downstream breakers need to be selectively coordinated. The TM240 release provides a fixed thermal curve and magnetic trip — not adjustable, so coordination studies should verify that the instantaneous trip setting does not overlap with downstream device curves. The rated insulation voltage Ui of 800 V covers 480 V and 600 V class systems with margin.