The Schneider Electric G12F4A80 is a GoPact MCCB 125 molded-case circuit breaker rated 80 A at 40 °C with a thermal-magnetic TM-D trip unit providing LI protection — thermal for overload (L) and magnetic for short-circuit (I). The 4P configuration with 4D neutral protection (1 x Ir) gives full overcurrent protection on all poles including the neutral — not just a switched neutral — which matters for TN or TT systems where the neutral must be protected. Rated operational voltage is 415 V AC 50/60 Hz per EN/IEC 60947-2, and the breaker is certified for isolation (suitability for isolation: Yes per the same standard), so it can serve as a visible disconnect point in the panel. The IP20 finger-safe enclosure (IEC 60529) means it is protected against solid objects larger than 12.5 mm — enough for panel-internal installation where the breaker is behind a locked door, but not rated for washdown or outdoor exposure.
Dimensions are 100 mm wide, 130 mm high, 60 mm deep — a compact 4P footprint for a 125 A frame. Connection pitch is 25 mm, which matches standard busbar systems and terminal blocks on a DIN-rail backplate. Screw terminals front-connect both line and load, so the breaker can be wired without reaching behind the panel. The toggle control and grey RAL 7035 housing are standard for European industrial panels. Mechanical durability is 30,000 cycles; electrical durability is 8,000 cycles at 415 V at rated current. For a distribution breaker that sees infrequent switching (typically a few operations per year), this is well beyond the service life of the panel. Power dissipation per pole is 18.7 W — at 80 A load, expect about 75 W total heat to vent from the enclosure.