The MGP6304XFO is a PowerPacT 4 basic frame rated 630 A continuous, 4 poles, with a 50 kA Icu and Ics at 415 V AC 50/60 Hz — that breaking capacity means it can safely clear a fault up to 50 kA without the arc flashing over, which is the standard interrupt rating for heavy distribution panelboards in commercial and light industrial mains. It's a Category A breaker (no intentional short-time delay), so it's sized for instantaneous trip coordination downstream of a larger main. This is a basic frame — no trip unit included, no earth-leakage module. The buyer sources the trip unit separately (typically a Micrologic or standard thermal-magnetic plug-in) to set the protection curve. The contact position indicator and isolation suitability per BS EN 60947-2 mean it doubles as a visible-break disconnect for lockout/tagout when the trip unit is fitted.
Panel-mounted via backplate support, 6-module wide at 35 mm per module (185 mm total width), 255 mm tall, 110 mm deep. Mounts horizontally or vertically. IP40 front face keeps out tools and fingers; IK07 impact rating means it survives a 2 J hammer blow without cracking the case. Pollution degree 3 per EN/IEC 60664-1 — rated for conductive pollution in industrial enclosures, so no additional conformal coating needed in a typical panel environment. Altitude derating applies above 2000 m.
Mechanical endurance rated at 15,000 cycles. Electrical endurance at 440 V In/2: 8000 cycles, dropping to 4000 cycles at full rated current In. That's typical for a molded-case frame of this class — the contacts are sized for the 630 A continuous rating, not for frequent switching. This is a distribution breaker, not a motor-switching device. The toggle control and contact position indicator give visual confirmation of state.