The Siemens 3VA1063-2ED36-0CC0 is a SENTRON molded case circuit breaker designed for line protection in industrial distribution panels. It carries a 63 A continuous rating at 40 °C and holds that rating steady through 50 °C, only tapering to 58 A at 70 °C — so it's not a part that forces a derating derate early in the cabinet thermal budget.
Breaking capacity — what the system can handle
This 3-pole MCCB delivers 52.5 kA at 240 V, 32 kA at 415 V, and 13.6 kA at 440 V. At 500 V and 690 V it still clears 7.5 kA. That means on a 415 V distribution board with a high-fault transformer, it handles the worst-case bolted fault without the breaker welding open — the interrupting rating is the number that keeps the arc flash boundary in check, not the continuous amps.
Integrated undervoltage release
The breaker ships with an undervoltage release (UVR) built in and two auxiliary switches HQ. That UVR means if the control voltage dips below the dropout threshold, the breaker trips — a common requirement on conveyor systems or pump stations where a lost phase or sagging supply needs to drop the load before the motor contactor tries to reaccelerate into a stalled rotor. No separate shunt-trip module to buy and wire; it's inside the breaker.
Panel fit and thermal management
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this breaker fits a standard 3-pole MCCB footprint on a DIN rail or mounting plate. The maximum power loss is 19.8 W — that's the heat it dumps into the enclosure at full rated load. In a sealed stainless panel with no fan, that 20 W per breaker adds up fast; plan the thermal rise against the 70 °C max operating ambient and the 80 °C storage limit.