The G12F3A16 is a Schneider Electric GoPact MCCB 125 — a 3-pole molded-case circuit breaker rated 16 A at 40 °C (the TM-D thermal-magnetic trip unit handles overloads thermally and shorts magnetically, LI protection). Rated operational voltage is 415 V AC 50/60 Hz per EN/IEC 60947-2, with insulation voltage 440 V AC. This is a Category A breaker (no intentional short-time delay), so it trips instantaneously on magnetic pickup — typical for distribution feeder protection, not selective coordination downstream.
Connection pitch is 25 mm. Dimensions are 75 mm wide × 130 mm high × 60 mm deep.
Operating ambient -20 to 55 °C, storage -35 to 85 °C. Altitude derating: full rating to 2000 m, derate above up to 5000 m. Electrical endurance is 8000 cycles at rated current and 415 V; mechanical endurance 30,000 cycles. Power dissipation is 18.7 W per pole — factor that into panel thermal calculations if the breaker is heavily loaded in a sealed enclosure.