630 A SENTRON MCCB — line protection with ground-fault monitoring
The Siemens SENTRON 3VA2463-6HM42-0AA0 is a 4-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in distribution panels. Its 242 kA breaking capacity at 240 V and 187 kA at 415 V give it the headroom to clear high-fault scenarios without cascading upstream — a key consideration when coordinating selectivity in a main or tie breaker position. Rated insulation voltage is 800 V, and the breaker includes summation-current ground-fault monitoring on the L+N conductors. The unit draws a maximum power loss of 162 W, which factors into enclosure ventilation planning.
Breaking capacity across voltage levels
Breaking capacity drops with system voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The steep fall at 690 V means this breaker is not suited for 690 V main service where fault current exceeds 9 kA — a coordination study should confirm the available fault current at that voltage.
Thermal derating and ambient limits
Continuous current is rated 630 A at 40 °C, derating linearly to 520 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If the breaker sits in a non-climate-controlled enclosure, the 70 °C upper operating limit is the binding constraint — not the storage figure.
Physical footprint and panel fit
Dimensions are 248 mm high, 184 mm wide, 110 mm deep. The 184 mm width for a 4-pole frame is standard for this class; verify gland-plate cutout and phase barrier clearance before committing the back panel layout.