The Schneider Electric G12T4F50 is a GoPact MCCB 125 molded case circuit breaker rated 50 A at 40 °C with a TM-D thermal-magnetic trip unit. Its 10 kA breaking capacity at 415 V AC (performance level T) suits it for distribution panels where fault levels stay under that threshold — common in commercial and light industrial installations. The 4-pole configuration with neutral protection set at 1 x Ir (4D) covers all live conductors, including the neutral as a protected pole.
Ratings and what they mean for your panel
The 50 A continuous rating at 40 °C is the current the breaker carries without tripping under normal conditions. If your panel ambient runs hotter, expect derating — the trip unit is calibrated to this baseline. The 10 kA breaking capacity at 415 V AC means it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream; verify your available fault current at the panelboard stays under this value during coordination study. The TM-D trip unit provides LI protection: thermal (L) for overload with a time-delay characteristic, and magnetic (I) for short-circuit with instantaneous response. This is the standard protection profile for distribution feeders and branch circuits where motor inrush is not a concern — the magnetic pickup is fixed and not adjustable, so confirm it coordinates with downstream devices. Rated insulation voltage (Ui) is 440 V AC, and operational voltage (Ue) is 415 V AC, 50/60 Hz. The breaker is suitable for isolation per EN/IEC 60947-2, meaning you can use it as a visible-break disconnect for safe maintenance — provided the toggle position is verified.
Mounting and integration
Mounts fixed to a backplate — not DIN-rail — via screw terminals with a 25 mm connection pitch. Accepts horizontal or vertical orientation, flat on the back. The IP20 finger-safe enclosure protects against accidental contact but is not rated for washdown or outdoor exposure; install inside a panel rated for the environment. Front-facing connections on both line and load sides simplify bus-bar and cable routing in a standard distribution panel. The grey (RAL 7035) housing blends with common enclosure interiors. Pollution degree 3 per IEC 60664-1 and overvoltage category III mean it is designed for fixed installations where transient overvoltages are controlled — typical in building distribution boards, not exposed substations.