The code IC65N 3P C4A (specifically Schneider Electric part number A9F18304) represents a highly specific industrial-grade Miniature Circuit Breaker (MCB) from the Acti9 iC65 series. It is designed to protect low-voltage electrical systems from overloads and short circuits.

Breakdown of the Description

1. iC65N: The series name from the Acti9 low-voltage range, where 'N' denotes a standard breaking capacity (typically 6kA).
2. 3P: Three poles, meaning it is designed to switch and protect three-phase electrical systems.
3. C: C-curve magnetic tripping characteristic, which trips at 5 to 10 times the rated current, making it ideal for loads with moderate inrush currents like motors and transformers.

4A: Rated operational current of 4 amperes at 400V AC.