The Schneider Electric A9F08303 is an Acti9 iC60H miniature circuit breaker (MCB) rated for 3 A with a D tripping curve, configured as a 3-pole unit. Breaking capacity reaches 70 kA Icu at 380…415 V AC and 50 kA Icu at 440 V AC per EN/IEC 60947-2, with an Icn of 10 kA at 400 V AC per EN/IEC 60898-1. This dual-rated MCB satisfies both the performance (60947-2) and residential/commercial (60898-1) standards, giving the specifier flexibility in panel design.
Mounts on standard DIN rail. The 3-pole body occupies 6 x 9 mm pitches (54 mm width). Depth of 78.5 mm and height of 91 mm fit within typical distribution board envelopes. Terminals accept 1…25 mm² rigid or 1…16 mm² flexible conductors; tightening torque is 2 N.m. IP20 finger protection is standard for the enclosure.
The thermal-magnetic trip unit provides a magnetic threshold of 12 x In (±20 %). For a 3 A MCB, this means magnetic pickup occurs between approximately 28.8 A and 43.2 A. The D curve is selected where load inrush exceeds the C-curve range — for example, small motors, solenoid banks, or power supplies with high capacitive start-up.
Compliance documentation traceability
It is suitable for isolation per both standards. Pollution degree 3 (industrial environment) and overvoltage category IV support installation at the service entrance or main distribution board.