What this MCCB delivers
The Siemens 3VA2463-6HN32-0JC0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for line protection, meaning it sits at the main feeder or large branch to protect cables and busbars against overload and short-circuit. Its 630 A continuous current at 40 °C and 242 kA interrupting capacity at 240 V mean it can handle high-fault utility feeds without cascading failure upstream — a key spec for main switchboard coordination studies. The electronic trip unit is an ETU350, a programmable LSIG (long-time, short-time, instantaneous, ground-fault) platform. The unit supports voltage triggering for remote trip via a shunt trip (STL) release, and carries two auxiliary switches HQ for status feedback to a PLC or building management system. Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3VA2 frame size that fits Siemens switchboard cubicles and most retrofit panels with existing busbar drilling patterns.
Interrupting capacity across voltage levels
The interrupting ratings span the common industrial voltages: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. The 187 kA figure at 415 V is the one most panel builders will use for IEC 61439-1 short-circuit withstand verification on a 400 V distribution board.
Thermal derating — real-world continuous current
The 630 A rating holds at 40 °C. Above that, derate linearly: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If the panel ambient hits 50 °C, the breaker is good for 593 A continuous — a 6% reduction that must be factored into the load schedule.
Environmental and endurance limits
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss at rated current is 162 W — relevant for panel thermal calculations. Mechanical endurance is 15,000 operations, typical for a fixed-mount MCCB in main distribution.