GoPact MCCB 125 — 63 A, 3-Pole, Thermal-Magnetic
The Schneider Electric G12E3A63 is a GoPact MCCB 125-series moulded-case circuit breaker, 3-pole fixed mount, rated 63 A at 40 °C with a TM-D thermal-magnetic trip unit. The TM-D trip provides LI protection: thermal for overload (L), magnetic for short-circuit (I). That is the standard two-step curve for general distribution — no ground-fault or electronic adjustment on this unit.
Above that, the thermal element derates — if your enclosure runs hotter, you need to downrate or ventilate. For a 415 V panel with a prospective short-circuit current under 15 kA, this breaker clears the fault without upstream damage. Overvoltage category III confirms it is rated for fixed-installation distribution boards, not just downstream equipment. The 440 V insulation voltage (Ui) sets the maximum voltage the internal insulation withstands continuously.
No minimum-buy constraints typical of last-time-buy or phase-out parts apply here.
Mounts fixed to a backplate — not DIN-rail snap-on. Both line and load connections are front-accessed screw terminals with a 25 mm pole pitch, so busbar and cable landing are straightforward. IP20 finger protection on the front (IEC 60529) — safe for open panel mounting but not for washdown zones. Ambient operating range -20 to 55 °C, storage -35 to 85 °C.