The G12F4A100 is a 4-pole GoPact MCCB 125 with a TM-D thermal-magnetic trip unit, rated 100 A at 40 °C. The magnetic (instantaneous) element handles short-circuit protection (I), while the thermal (L) covers overloads. Breaking capacity is 30 kA at 380/415 V AC (performance level F), which means it can safely interrupt a fault current up to 30,000 A without welding contacts or rupturing the case — critical for upstream coordination in a distribution panel. Rated operational voltage is 415 V AC 50/60 Hz, with an insulation voltage of 440 V AC, both per EN/IEC 60947-2. That standard covers the MCCB's ability to make, carry, and break currents under normal and abnormal conditions — it's the core certification for molded-case breakers in industrial distribution. Overvoltage category III suits fixed-installation distribution boards.
Dimensions are 100 mm wide, 130 mm high, 60 mm deep — it occupies a compact footprint for a 4-pole 100 A breaker. Mounting position can be horizontal, vertical, or flat on the back; no derating required for orientation. Power dissipation per pole is 18.7 W, so at full load the breaker sheds about 75 W total. That heat has to leave the enclosure — factor it into your panel thermal calculation, especially if the MCCB is grouped with other heat sources. The toggle control type gives a clear visual indication of trip status; the grey RAL 7035 housing is the standard industrial enclosure colour.
Mechanical durability is rated at 30,000 cycles, electrical durability at 8,000 cycles at 415 V at full rated current (In). That 8,000-cycle figure is the number of load-break operations before contact wear becomes significant — fine for distribution duty where the breaker operates infrequently, but not for frequent switching applications (use a contactor for that).
Operating altitude is 0–2000 m without derating, 2000–5000 m with derating. The manufacturer provides a declaration of conformity covering these standards; RoHS and REACH compliance documentation is available on request.