Frame rating and thermal derating — what the 630 A means in the panel
The SENTRON 3VA2463-6JQ32-0HA0 is a 3-pole molded case circuit breaker on a 630 A frame, designed for line protection. That 630 A full-scale value is the thermal-magnetic or electronic trip rating at 40 °C ambient; above that temperature the continuous current must be derated — 570 A at 50 °C, 510 A at 60 °C, and 450 A at 70 °C. If the panel ambient runs hot, size the load circuit against the derated value, not the nameplate frame rating. The interrupting capacity tracks the system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. At 690 V the available fault current must be verified against the 9 kA limit — common in 690 V mining or marine distribution where upstream transformers can deliver higher prospective fault levels.
Shunt trip and communication — what the order code suffix carries
This variant includes a shunt trip release (STL) for remote tripping via a control signal, and a communication function — the SENTRON 3VA communication module interface. Maximum power loss is 162 W at rated current — account for that heat in the enclosure ventilation calculation, especially when multiple breakers are ganged in a switchboard section.
Panel fit — dimensions and mounting
Dimensions: 248 mm height, 138 mm width, 110 mm depth. The 138 mm width is the standard 3-pole MCCB footprint for this frame size.