Line protection MCCB with ground-fault monitoring
The Siemens SENTRON 3VA2063-5JQ46-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current, designed for line protection in distribution panels. Its 121 kA breaking capacity at 415 V means it can safely interrupt high fault currents typical in industrial mains without upstream coordination issues — a key spec for panel builders sizing the main breaker on a 400 V bus. The part carries a communication function (likely via a plug-in module or bus interface) and integral ground-fault monitoring using summation current formation on L+N conductors, so it handles both overcurrent and ground-fault protection in one device, reducing panel wiring.
Breaking capacity across voltages
Rated breaking capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. The steep drop at 690 V reflects the arc extinction limits of the 63 A frame — this breaker is not intended for 690 V mains. At 400/415 V, the 121 kA rating covers most transformer-fed industrial services with high available fault current.
Thermal derating and ambient range
The breaker holds its full 63 A rating from 40 °C through 70 °C ambient — no derating needed in a warm enclosure. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 5.4 W, manageable for thermal budgeting in a crowded DIN-rail panel.
Dimensions and panel fit
Dimensions are 181 mm height, 140 mm width, 86 mm depth. The 86 mm depth fits shallow enclosures; the 140 mm width for a 4-pole MCCB is standard. Verify the mounting footprint against the existing backplate or DIN-rail adapter.