The Schneider Electric G12T4A16 is a GoPact MCCB 125 — a fixed-mount, 4-pole thermal-magnetic moulded-case circuit breaker rated 16 A at 40 °C. It's built for distribution duty in backplate-mounted panels, with front-front connection via screw terminals and a 25 mm pole pitch.
Key ratings — what they mean on the job
If your enclosure runs hotter, you'll need to derate — the spec doesn't give a curve here, but the IEC standard expects it. The 10 kA breaking capacity at 380/415 V AC (50/60 Hz) is the fault current it can safely interrupt; anything above that and the breaker may fail to clear the arc. Rated insulation voltage (Ui) is 440 V AC, and rated operational voltage (Ue) is 415 V AC — so it's a 400 V-class breaker. The 4D protected poles mean all four poles are protected (no solid-neutral variant), with neutral protection set at 1 x Ir. Power dissipation per pole is 18.7 W at rated current; four poles means roughly 75 W total heat to get rid of in the enclosure. Mechanical endurance is 30,000 cycles, electrical endurance 8,000 cycles at 415 V at In — that's a maintenance interval, not a design-life limit, but if you're switching the load on and off daily rather than leaving it closed, those cycles add up.
Standards, environment, and approvals
Built and tested to EN/IEC 60947-1 and EN/IEC 60947-2 (including Annex H for EMC). Overvoltage category III (equipment in fixed installations).