630 A MCCB with 242 kA interrupting capacity
The Siemens SENTRON 3VA2463-6KP32-0CL0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in main distribution panels. Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V — meaning it clears high-fault currents without cascading upstream, critical for transformer secondaries or large bus risers where available fault current is substantial. The breaker carries a communication function for integration into monitoring systems, plus an undervoltage release (UVR) and a configurable auxiliary switch set: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ.
Thermal derating and panel fit
The continuous current rating drops with ambient temperature: 630 A at 40 °C, 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 the panel ambient runs above 40 °C, size the breaker for the derated value — a common oversight in tightly packed enclosures. Physical footprint is 138 mm wide, 248 mm tall, 110 mm deep, fitting standard MCCB mounting patterns. Maximum power loss is 164.5 W, which factors into enclosure thermal calculations.
Breaking capacity across voltage levels
The interrupting capacity is voltage-dependent: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. At 690 V the 9 kA figure is relatively low — verify the available fault current at that voltage before specifying. The trip unit has a minimum setting of 945 A and a maximum of 5670 A, giving a wide adjustment range for coordinating with downstream breakers.