The G12F4F20 is a GoPact MCCB 125, a 4-pole (4P) molded-case circuit breaker from Schneider Electric's distribution-grade GoPact range. Its 20 A trip unit rating at 40 °C and 30 kA breaking capacity at 415 V AC mean it handles branch-circuit fault levels typical of light industrial and commercial distribution boards — not main-service incoming, but downstream sub-feeders where fault current stays under 30 kA. The thermal-magnetic TM-D trip unit provides LI protection: thermal for overload (L), magnetic for short-circuit (I). That's the standard two-curve protection for cable and busbar protection in a distribution panel. Rated operational voltage is 415 V AC at 50/60 Hz, with an insulation voltage of 440 V AC — the breaker is built for 400 V class three-phase systems common across Europe and Asia. Mounting is fixed to a backplate, not DIN rail — plan for screw-terminal lugs on a panel-mount bracket. Connection pitch is 25 mm, and both line and load connections are front-accessible via screw terminals. Neutral is on the left, which matters when you're wiring a 4-pole board and the busbar order is fixed.
Integration and compliance notes
Electrical durability is 8000 cycles at rated current at 415 V; mechanical durability is 30,000 cycles. For a distribution breaker that sees infrequent switching, that's well within typical panel life. Power dissipation is 18.7 W per pole — at 20 A load, four poles dissipate roughly 75 W total. Factor that into enclosure thermal rise if the board is densely populated. IP20 finger-safe terminals are standard for enclosed panels; no washdown rating here. Standards compliance covers EN/IEC 60947-1, EN/IEC 60947-2, and Annex H for selective coordination. Utilisation category A means it's not intended for motor-starting duty — use it for cable, busbar, and transformer protection in distribution. Operating altitude is 0–2000 m without derating, 2000–5000 m with derating.