The G12T4A100 is a 4-pole GoPact MCCB 125 moulded-case circuit breaker from Schneider Electric, rated 100 A at 40 °C with a 10 kA breaking capacity at 415 V AC (category A, per EN/IEC 60947-2). It uses a TM-D thermal-magnetic trip unit — thermal element for overload (L), magnetic for short-circuit (I). The 4D protected poles with neutral protection set to 1 x Ir mean it switches all four poles and the neutral sees the same overload threshold — common for three-phase plus neutral distribution.
Mounting and integration details
Fixed-mount on a backplate, screw terminals front-connected both top and bottom. The 25 mm connection pitch matches standard busbar spacing for a 4-pole breaker. It mounts horizontally or vertically flat on the back — no derating needed for orientation, but altitude derating kicks in above 2000 m. The IP20 finger-safe terminals are fine inside a closed panel; not for washdown areas.