400 A MCCB with a 4800 A frame — what that means on the line
The Siemens SENTRON 3VA2440-6HN32-0JC0 is a molded case circuit breaker rated for 400 A continuous current, built on a 4800 A frame. That frame rating means the internal bus and arc chambers are sized for fault currents up to 4800 A, so the breaker handles high-fault-duty panels without the contacts welding shut. It carries 242 kA interrupting capacity at 240 V and 187 kA at 415 V — enough for most industrial service-entrance or feeder positions where the available fault current is high. The 400 A rating holds flat from 40 °C through 70 °C ambient — no derating curve to chase in a warm enclosure. That's a practical advantage: if the panel sits next to a furnace line or in a non-air-conditioned electrical room, the breaker still carries its full 400 A without nuisance tripping.
Fit and panel integration — 138 mm wide, 3-pole
At 138 mm wide, 248 mm tall, and 110 mm deep, this 3-pole MCCB fits standard Siemens SENTRON mounting bases and busbar systems. The 110 mm depth means it clears most 200 mm deep enclosures with room for rear-exit cables. Panel builders: the 63.5 W maximum power loss at full load should be factored into the enclosure thermal budget — that's heat that needs to escape through the gland plate or ventilation. It ships with a shunt trip (STL) for remote emergency-off circuits and two HQ auxiliary switches for status feedback to a PLC or indicator lamp. The basic switch variant is 3VA2440-6HN32-0AA0 — the -0JC0 suffix adds the shunt trip and aux switches pre-installed. No field retrofit required.