The Schneider Electric A9F05104 is a 1-pole Acti9 iC60 miniature circuit breaker rated 4 A with a D tripping curve. It sits on a DIN rail, occupies 2 x 9 mm pitches (18 mm wide), and is designed for distribution circuits where high inrush currents — motor starts, transformer energisation, capacitive loads — demand a magnetic trip threshold of 12 x In (±20 %).
Rated Icu of 50 kA at 240 V AC (50/60 Hz) per EN/IEC 60947-2, and an Icn of 6 kA at 230 V AC per EN/IEC 60898-1. That dual-rating means it qualifies for both industrial panel coordination (60947-2 Category A) and residential / commercial final circuits (60898-1). The DC side holds 15 kA at 12–60 V DC and 10 kA at 60–72 V DC — useful for control-power or battery-backed sub-circuits.
Snaps onto standard DIN rail. The double terminal accepts 1–25 mm² rigid or 1–16 mm² flexible at each pole, with a tightening torque of 2 N·m.
Rated insulation voltage 500 V AC, overvoltage category IV. Thermal-magnetic trip unit with D curve — magnetic trip at 12 x In (48 A typical). Electrical endurance 10,000 cycles, mechanical 20,000 cycles.