The Siemens SENTRON 3VA1050-3ED36-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C through 50 °C ambient, with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL). Breaking capacity is voltage-dependent: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V — giving the SCCR headroom for most industrial distribution panels fed from a transformer secondary up to 690 V. Rated insulation voltage is 800 V, and the maximum power loss is 14.6 W, which factors into enclosure thermal calculations when grouping multiple breakers.
Thermal derating and operating limits
The breaker holds 50 A without derating from 40 °C to 50 °C ambient. Above that, current must be reduced: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. This curve is the one to check when the panel is in a non-conditioned space or near heat-generating equipment. Operating temperature range spans -25 °C to +70 °C; storage range is -40 °C to +80 °C. The storage limit governs handling during transport and warehouse hold, not running duty.
Dimensions and panel fit
The 3VA1050-3ED36-0HA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this SENTRON generation — it occupies the same DIN-rail or mounting-plate slot as other 3VA frame breakers.