630 A MCCB with TM240 release and UVR — selectivity backbone for high-fault panels
The Siemens SENTRON 3VA1463-7EF32-0DJ0 is a 3-pole molded case circuit breaker rated 630 A at 40 °C, built around a TM240 thermal-magnetic overcurrent release. It carries a 440 kA breaking capacity at 240 V (Icu), dropping to 17 kA at 690 V — that SCCR headroom makes it a main or feeder breaker in high-fault installations like industrial switchboards and transformer secondaries. The undervoltage release (UVR) is factory-fitted, so the breaker trips on loss of control voltage without an external relay. Rated insulation voltage is 800 V, and the breaker delivers full 630 A through 50 °C ambient before derating begins — at 70 °C it still carries 583 A. That thermal margin suits it for enclosed or high-ambient panels where downstream breakers lose headroom faster. The auxiliary switch block carries 2 auxiliary switches plus 1 trip alarm switch (HP design), giving the PLC or BMS a positive confirmation of breaker state and fault tripping without a separate contactor stack.
Breaking capacity across voltages — coordination planning
The 3VA1463-7EF32-0DJ0's Icu is 440 kA at 240 V, 242 kA at 415 V and 440 V, 154 kA at 500 V, and 17 kA at 690 V. For a 480 V panel (common in North America), the 154 kA figure sits between the 415 V and 690 V values — confirm the available fault current at your service entrance before committing the BOM line. The TM240 release is a fixed thermal-magnetic unit, not electronic, so coordination curves are straightforward for selectivity studies.
Panel fit — dimensions and mounting
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. It mounts on a standard DIN rail or can be screw-fixed to a backplate. The 138 mm width is a 3-pole frame — verify the existing busbar or lug spacing matches before panel rework.