The Siemens SENTRON 3VA1050-3ED36-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release. It's designed for line protection — the primary role is guarding feeder and branch circuits against overloads and short circuits in distribution panels. The 75.6 kA breaking capacity at 240 V AC means it can safely interrupt high-fault currents without upstream devices needing to clear the fault, which is critical for selectivity coordination in a multi-level panel.
Breaking capacity across voltages
The interrupting rating drops as system voltage rises: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 480 V panel (common in North American industrial), the 32 kA at 440 V is the closest published figure — expect a similar or slightly lower value at 480 V. This matters when verifying SCCR against the available fault current at the panel.
Thermal derating and ambient limits
The breaker holds 50 A from 40 °C up to 50 °C, then derates linearly: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If the breaker sits near a heat source or in a non-ventilated enclosure, the 70 °C ceiling and the derating curve give you the real continuous current the breaker can carry without nuisance tripping.
Mounting and auxiliary switch configuration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint for panel mounting on a mounting plate or DIN rail adapter. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), which provides remote status indication for the open/closed state and a separate signal when the breaker trips on fault. No undervoltage release or shunt trip is built in; those are separate accessories.