It adds earth-leakage protection to the circuit, rated at 25 A with 30 mA sensitivity, Type A-SI (Super Immunised) for instantaneous tripping on AC networks at 230/240 V, 50/60 Hz. The 2-pole unit occupies 3 x 9 mm pitches (63 mm wide) on a DIN rail, making it a straightforward fit into a standard distribution board or sub-panel.
The 30 mA sensitivity is the standard threshold for personal protection against indirect contact in residential and commercial final circuits — it catches leakage currents that could pass through a human body without nuisance-tripping on normal cable capacitance. Type A-SI (Super Immunised) means the device is designed to resist unwanted tripping from high-frequency leakage or transient surges common on electronic loads (switched-mode power supplies, variable-speed drives), while still detecting sinusoidal AC and pulsating DC residual currents. The instantaneous time delay (no intentional delay) ensures the RCD clears a fault within the IEC 61009-1 trip curve, which is the default for socket-outlet and general-purpose circuits where fast disconnection is required. Voltage-independent tripping technology means the RCD does not rely on the mains voltage to operate — it uses the fault current itself to mechanically trip the mechanism. This is a reliability advantage in circuits where the neutral or phase could be lost upstream, as the RCD still provides earth-leakage protection even if the supply voltage collapses. The 25 A rated current matches the upstream MCB rating in most final circuits serving socket outlets, lighting, or small appliances. If the circuit breaker is also 25 A, the RCD is thermally coordinated — no derating needed. The 6 kV impulse withstand voltage (Uimp) and pollution degree 3 rating confirm the device is suitable for installation in standard distribution boards where transient overvoltages and conductive pollution (dust, condensation) are expected.
Clip-on mounting to the DIN rail and screw connection to the iC60 MCB's double terminal means the RCD adds no extra busbar work — it simply latches onto the breaker's outgoing side. The tunnel-type terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible cable, with a tightening torque of 2 N.m and a strip length of 14 mm. The 74 mm depth and 91 mm height fit within the envelope of a standard modular enclosure; the IP20 rating on the body (IP40 in the modular enclosure) is adequate for dry indoor panels but not for washdown or outdoor locations.