630 A MCCB for main feeder and high-fault panels
The Siemens SENTRON 3VA2463-7HN32-0JC0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with interrupting capacity reaching 330 kA at 240 V and 242 kA at 415 V. That interrupting rating places it squarely in high-fault main-breaker duty — think transformer secondaries, large motor control centers, or service-entrance panels where available fault current exceeds what a standard 65 kA or 100 kA breaker can handle. The 630 A frame carries a continuous current derating curve from 630 A at 40 °C down to 520 A at 70 °C, so panel ambient temperature directly affects the usable ampacity.
Line protection with integrated shunt trip
This variant is configured for line protection (cable/feeder protection, not motor or generator duty) and ships with a factory-installed shunt trip release (STL) and two HQ auxiliary switches. The shunt trip allows remote tripping via a control voltage signal — useful for emergency-stop circuits or supervisory shutdown sequences. The auxiliary switches provide status feedback (open/closed) to a PLC or SCADA input module. The basic switch platform is order code 3VA2463-7HN32-0AA0, so the -0JC0 suffix adds the shunt trip and aux switches as a pre-assembled option rather than field-installed accessories.
Physical fit and panel integration
Dimensions are 110 mm deep, 138 mm wide, and 248 mm tall. The 138 mm width (5.43 in) is a 3-pole frame size that occupies three adjacent 45 mm module positions on a DIN rail or panel-mount busbar system. Maximum power loss is 162 W at rated current, so ventilation or derating within the enclosure must account for that heat dissipation — particularly in sealed, high-ambient cabinets. Storage temperature range is -40 °C to 80 °C; operating ambient is -25 °C to 70 °C.
Interrupting capacity across voltage levels
The breaker's interrupting capacity varies significantly with system voltage: 330 kA at 240 V AC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V. The steep drop at 690 V (9 kA) is a key constraint — if the application is a 690 V distribution system, this breaker is not suitable for high-fault locations at that voltage level. For 400 V class systems (common in European and Asian industrial plants), the 242 kA rating provides generous headroom for most main-breaker positions.