The Schneider Electric A9Z65491 is an Acti9 iID 4-pole residual current circuit breaker (RCCB) rated for 100 A continuous current with a 300 mA earth-leakage sensitivity. This makes it a fit for photovoltaic arrays, lift drives, and variable-speed drive circuits where standard Type A or AC RCCBs would false-trip.
The 100 A rated current (In) sets the continuous load this RCCB can carry without derating — sized for a main incomer or a heavy outgoer group in a distribution board. The 300 mA sensitivity is a selective (time-delayed) threshold, typical for upstream protection where downstream 30 mA RCDs handle personal shock protection; this avoids cascade tripping. Type B-SI per IEC 61008-2-1 and IEC/EN 62423 covers all fault current waveforms including smooth DC from rectified supplies, which is why the application list includes photovoltaic and speed-drive circuits. Rated insulation voltage (Ui) is 500 V, and the overvoltage category is IV — the highest category for mains-level distribution, meaning it withstands transient overvoltages at the service entrance. The 8/20 µs impulse withstand of 5 kA per EN/IEC 61008-1 confirms it survives surge events without damage. The toggle control with ON/OFF and trip-indicator LED gives local status at a glance.
Clip-on mounting to DIN rail, 8 x 9 mm pitch (72 mm wide). Neutral position is left. Wire stripping length is 14 mm, tightening torque 3.5 N·m. Padlocking provision allows lockout/tagout for safe maintenance.