Line protection MCCB with undervoltage release
The Siemens SENTRON 3VA1050-4ED36-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C and derating to 45 A at 70 °C. Its breaking capacity hits 75.6 kA at 415 V — enough to clear high-fault industrial feeds without cascading upstream breakers. The integrated undervoltage release (UVR) drops the trip mechanism if control voltage falls below threshold, a common requirement for emergency-stop circuits and safety disconnects.
Panel fit and auxiliary wiring
At 70 mm deep × 76.2 mm wide × 130 mm tall, this MCCB fits standard SENTRON 3VA panel footprints and mounts on a DIN rail or direct screw-fix. The factory-fitted 2 auxiliary switches HQ provide status feedback to a PLC or remote I/O without extra wiring — useful for confirming the breaker state in a safety circuit or asset-monitoring scheme.
Breaking capacity across voltages
Breaking capacity is voltage-dependent: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. The 415 V figure is the one that matters for most European 400 V distribution panels — verify your available fault current against this curve before specifying.