Rated 40 A with 30 mA earth-leakage sensitivity, it trips instantaneously and carries Type A-SI (Super Immunised) classification, meaning it handles pulsed DC fault currents and resists nuisance tripping from high-frequency harmonics or transient surges common on modern electronic loads.
The 40 A [In] rating matches the upstream MCB's thermal-magnetic curve — this RCD does not provide overcurrent protection itself; it monitors leakage only. The 30 mA sensitivity is the standard threshold for personnel protection (shock risk) per IEC 60364, while the instantaneous trip (no intentional delay) ensures fast disconnection on earth faults. Type A-SI (Super Immunised) is the deciding factor for installations with variable-speed drives, UPS systems, or LED lighting — loads that generate smooth DC fault currents or high-frequency leakage that would desensitise or falsely trip a standard Type A or AC device. The 8/20 µs impulse withstand rating of 3000 A confirms it survives surge events without welding the sensing coil. The insulation voltage is 500 V AC, and impulse withstand is 6 kV — figures that align with IEC 60947-2 for coordination in standard distribution panels.
Clip-on mounting to DIN rail, 36 mm width (2 modules at 9 mm pitch each), 73.5 mm depth. Plugs directly into the right-side busbar of an iC60 MCB via the tunnel-type terminals — no additional wiring needed for the phase connection. Bottom terminals accept 1 to 35 mm² rigid or 1 to 25 mm² flexible cable; tighten to 3.5 N·m. Strip length 14 mm. The trip indicator gives local visual confirmation of a residual-current trip, aiding fault diagnosis without unclipping the module.