The Siemens SENTRON 3VA1150-6EF32-0KA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection. It carries a 50 A continuous rating at 40 °C, with a slight thermal derating curve: still 50 A at 50 °C, dropping to 45 A at 70 °C. The interrupting capacity hits 220 kA at 240 V, which provides serious fault-current headroom for high-capacity distribution panels or transformer secondaries.
Breaking capacity across voltages
This MCCB's breaking capacity varies significantly with system voltage: 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. That 17 kA floor at higher voltages is still adequate for most industrial 690 V circuits, but the real strength is in the 240–440 V range where it handles extreme fault currents.
Shunt trip and basic switch
The auxiliary release is a shunt trip (STL), allowing remote tripping from a control signal. The supplied basic switch is order code 3VA11506EF320AA0, which is the base switching mechanism this breaker ships with. No undervoltage release, no ground-fault monitoring, and no communication function are built in — this is a straightforward line-protection device with a remote-trip option.
Physical fit and panel integration
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm tall. The 76.2 mm width is a standard 3-pole MCCB footprint for DIN-rail or panel-mount enclosures. Rated insulation voltage is 800 V, so it's suitable for 690 V systems with margin. Maximum power loss is 14.6 W — factor that into enclosure thermal calculations if the panel is densely packed.