The Siemens SENTRON 3VA1050-4ED36-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated 50 A at 40 °C, designed for line protection in distribution panels. Its 121 kA breaking capacity at 240 VAC handles high fault currents typical of industrial mains, while the 75.6 kA at 415 VAC and 52.5 kA at 440 VAC cover common European and North American line voltages. The TM210 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings — no adjustment needed for standard feeder protection.
Breaking capacity and selectivity
At 500 VAC and 690 VAC the interrupting rating holds at 11.9 kA, so this breaker can serve 690 V line-to-line loads in regions where that voltage is common, though the lower fault current ceiling means upstream coordination must be checked. The 800 V rated insulation voltage confirms the internal clearance and creepage for those higher-voltage applications.
Thermal derating and panel integration
Rated current holds at 50 A from 40 °C through 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a sealed enclosure with multiple breakers ganged, the 70 °C ambient derating to 45 A is the figure to use for continuous load sizing. The 76.2 mm width (3 in) and 70 mm depth (2.76 in) fit standard SENTRON 3VA panel footprints; the 130 mm height (5.12 in) clears most distribution board gutters.
Auxiliary release and monitoring
This variant includes a shunt trip (STL) release for remote tripping via a control signal — useful for emergency-stop circuits or interlocking with a fire-alarm panel. The supplied basic switch is order code 3VA10504ED360AA0. No undervoltage release is fitted, and there is no trip indicator or communication module. Power loss at rated load is 14.6 W maximum, which matters for thermal budgeting in a crowded enclosure.