630 A MCCB for line protection with communication and UVR
The Siemens SENTRON 3VA2463-5KP32-0BH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in industrial distribution panels. Its 187 kA breaking capacity at 240 V handles high-fault scenarios without cascading upstream — critical for selectivity studies on large switchboards. The breaker includes an undervoltage release (UVR) and a communication function, making it suitable for monitored power distribution where remote trip indication or load shedding is required.
Breaking capacity across voltage levels
Rated short-circuit breaking capacity varies by system voltage: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. This voltage-dependent curve means the breaker's interrupting rating is not a single number — verify the available fault current at your specific line-to-line voltage. At 690 V the 9 kA figure limits application to lower-fault industrial networks or transformer-secondary positions.
Thermal derating and ambient temperature
Continuous current rating derates with rising ambient temperature inside the enclosure: 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 — the 630 A frame may need a lower trip unit setting to avoid nuisance tripping in a hot switchroom. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Auxiliary switches and release configuration
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops below a threshold — used for emergency stop circuits or undervoltage protection on motor feeders. The trip indicator confirms the breaker opened on fault vs. manual switching. No ground-fault monitoring version is included on this variant.
Physical dimensions and panel fit
Dimensions: 248 mm height, 138 mm width, 110 mm depth. The 3-pole frame fits standard MCCB mounting patterns in distribution panels. Depth of 110 mm is moderate — verify clearance for rear-connected busbars or cable terminations, especially in shallow enclosures.