What this MCCB carries and where it fits
The SENTRON 3VA2463-5HN32-0KA0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with a maximum breaking capacity of 187 kA at 240 V and 121 kA at 415 V. It is designed for line protection — meaning the primary role is protecting feeders and distribution buswork, not motor loads. The built-in shunt trip (STL) release allows remote tripping from a pushbutton or safety relay, which is the main differentiator from the base version (3VA2463-5HN32-0AA0) that carries no auxiliary release. At 110 mm deep, 138 mm wide, and 248 mm tall, this breaker fits standard SENTRON mounting footprints. The 162 W maximum power loss at full load means the panel designer needs to account for heat dissipation — not a concern in a ventilated enclosure, but worth checking if the breaker sits in a sealed, densely packed cabinet.
Breaking capacity across voltage levels
The interrupting rating drops as system voltage rises: 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. For a 480 V distribution panel (common in North American industrial plants), the relevant figure is the 500 V rating — 75.6 kA — which is well above what most secondary substations deliver. At 690 V the 9 kA rating still covers most motor control center bus faults, but verify against the available fault current at the point of installation.
Thermal derating — the real continuous current
The 630 A rating holds at 40 °C ambient. Above that, the breaker derates linearly: 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If the panel ambient runs at 50 °C — common in a packed MCC room with no air conditioning — the usable current drops to 593 A. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C.