630 A MCCB with 242 kA interrupting capacity at 240 V
The Siemens SENTRON 3VA2463-6JP32-0BH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in industrial power distribution. Its interrupting capacity reaches 242 kA at 240 V AC and 187 kA at 415/440 V AC, dropping to 121 kA at 500 V and 9 kA at 690 V — a curve that tells you this breaker is built for low-voltage main feeders where fault currents run high, not for 690 V branch circuits. The adjustable thermal-magnetic trip unit covers a range from 945 A minimum to 5 670 A maximum, giving the specifying engineer selectivity headroom downstream. It ships with an undervoltage release (UVR) and a complement of two auxiliary switches plus one trip alarm switch HQ, so the panel builder gets both status feedback and a shunt-trip-ready coil without a separate order line. Communication function is built in, which means this breaker can report status and trip events to a higher-level control system — useful for a plant-wide power monitoring scheme where you want to know which feeder cleared before the maintenance crew walks the line.
Thermal derating and power dissipation
The 630 A rating holds at 40 °C ambient. Above that, the breaker derates linearly: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your panel internal ambient runs 50 °C — common in a packed switchboard — you lose 60 A of headroom. Maximum power loss is 164.5 W, so ventilation or forced cooling may be needed in a sealed enclosure.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint for this class — it occupies three 45 mm module spaces on a DIN rail or direct-mount plate. Depth of 110 mm means it clears a 120 mm deep enclosure without a gland-plate conflict, but verify the handle-operating mechanism clearance if you are using a rotary handle through the door.