The G12T4F100 is a 4-pole GoPact MCCB 125 with a TM-D thermal-magnetic trip unit rated 100 A at 40 °C. The 4D protected poles mean all four poles are monitored for overload and short-circuit (L and I protection), with neutral protection set at 1 x Ir. It's a Category A breaker — no intentional short-time delay, so it trips fast on a fault, which is fine for feeder duty where selectivity is handled by a larger upstream device. Mounting is fixed to a backplate via screw terminals, with front-facing connections top and bottom — that's a standard footprint for panel builders wiring distribution boards. The 25 mm connection pitch matches common busbar and terminal block spacing.
The grey RAL 7035 colour is the standard industrial enclosure shade. For procurement documentation, the manufacturer provides a declaration of conformity covering the applicable IEC standards; RoHS and REACH compliance is standard for the GoPact range but verify on the specific batch certificate if your QA requires it.