Siemens SENTRON 3VA2463-6JQ32-0AB0 — 630 A MCCB for Line Protection
The Siemens SENTRON 3VA2463-6JQ32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a full-scale current of 630 A. It is designed for main or feeder protection in distribution panels where high fault current capacity is required. The interrupting ratings are substantial: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. These figures mean the breaker can safely clear very high fault currents without catastrophic failure, making it suitable for installations with high available fault current — typically large industrial switchboards or transformer secondaries. Thermal derating is explicit across the operating range: the breaker carries its full 630 A at 40 °C, but this drops to 600 A at 45 °C, 570 A at 50 °C, and continues down to 450 A at 70 °C. When sizing for a warm panel or high-ambient environment, use the derated value — not the 630 A nameplate — to avoid nuisance tripping.
Trip Unit and Adjustability
The electronic trip unit is adjustable between a minimum of 945 A and a maximum of 5 670 A, with an initial setting of 126 A. This wide range allows coordination with downstream breakers and load characteristics. Note that the trip indicator is not fitted on this variant, so a separate indication method is needed for fault diagnosis. The breaker includes a communication function for integration into a monitoring or energy management system, and is equipped with two auxiliary switches (HP design) for remote status feedback. No undervoltage release or auxiliary release is fitted as standard.
Physical Fit and Panel Integration
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — a standard MCCB footprint for this current class. The 110 mm depth is a key check for shallow enclosures or when mounting behind a gland plate. Panel builders should verify the depth clearance against the enclosure door and any busbar or cable ducting behind the breaker. Maximum power loss is 162 W at rated current. This heat must be dissipated within the enclosure; factor it into the thermal design of the panel, especially if multiple breakers are ganged or the enclosure is sealed.