63 A MCCB with flat thermal curve and high interrupting capacity
The Siemens SENTRON 3VA2063-5JQ32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a full-scale current of 63 A and an initial trip setting of 16 A. What sets this breaker apart is its interrupting capacity: 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 — figures that give the panel designer real selectivity headroom at common distribution voltages. The thermal curve is flat across the full ambient range: 63 A at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C, meaning no derating is required up to 70 °C operating ambient. That is unusual for a 63 A frame and simplifies panel thermal calculations.
Physical fit and panel integration
Dimensions are 181 mm height, 105 mm width, and 86 mm depth. The 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame, so it occupies the same DIN-rail or mounting-plate space as other 3VA2 breakers. Maximum power loss is 5.4 W, which keeps heat rise manageable in a crowded enclosure. Storage temperature range is -40 °C to 80 °C; operating range is -25 °C to 70 °C.
Auxiliary release and communication
This variant includes a shunt trip (STL) auxiliary release, designated as design of the auxiliary release. It also carries a communication function, which enables remote monitoring or control integration — useful for a line-protection MCCB in a managed distribution panel. The basic switch supplied is order code 3VA20635JQ320AA0.