The Schneider Electric G12F4F63 is a GoPact MCCB 125 molded case circuit breaker in a 4-pole configuration, rated 63 A at 40 °C with a TM-D thermal-magnetic trip unit. It's suitable for isolation per EN/IEC 60947-2, so you can use it as a disconnecting means in the panel.
If your panel runs hotter, you'll need to derate — the trip unit is calibrated for that 40 °C reference. The 4-pole version with neutral protection (4D) means the neutral pole is switched and protected at the same ratio as the phases — 1 x Ir — so it clears phase-to-neutral faults as well as phase-to-phase. That covers standard three-phase 400 V systems across Europe and much of Asia. Mechanical durability is 30,000 cycles, electrical durability 8,000 cycles at rated current at 415 V. That's a reasonable service life for a distribution breaker — not intended for frequent switching like a contactor, but fine for occasional isolation and fault clearing. Power dissipation per pole is 18.7 W, so the 4-pole unit dissipates about 75 W total. Factor that into your panel thermal calculation to avoid hot spots.
Mounting and connections
Fixed mounting on a backplate — no DIN rail on this one. The 25 mm connection pitch matches standard busbar systems. Both line and load connections are front-facing screw terminals, which makes wiring straightforward in a panel layout. The neutral is on the left side. Mounting position is flexible: horizontal, vertical, or flat on the back. That's another SKU I don't need to worry about orientation for.