It's a 3-pole unit rated 25 A continuous with a 30 mA trip sensitivity, Type A-SI (Super Immunised), meaning it handles pulsed DC fault currents and resists nuisance tripping from high-frequency harmonics or transient surges common on modern electronic loads. Rated operational voltage is 400 V AC at 50/60 Hz, with an insulation voltage of 500 V AC and impulse withstand of 6 kV per IEC 60947-2.
Clip-on mounting to DIN rail, 6 module pitches wide (54 mm). The add-on block screws directly to the side of an iC60 MCB — the electrical connection is by screws, bottom terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible cable. IP20 finger-safe, IP40 inside a modular enclosure.
The 30 mA sensitivity is the standard for personnel protection (shock hazard) per IEC 61009-1. Type A-SI (Super Immunised) means it's designed to stay put on circuits with variable-speed drives, UPS systems, or LED lighting — loads that generate smooth DC fault currents or high-frequency leakage that would trip a standard Type A or AC RCD. The voltage-independent tripping technology means the RCD operates even if the line voltage drops or is lost, which is critical for safety in fault conditions. Instantaneous trip time (no intentional delay) means it clears fast on a ground fault, but selectivity with downstream RCDs may require coordination — not a problem for a single outgoer circuit.