It is rated at 25 A with a 300 mA residual tripping current, Type B, meaning it detects AC, pulsating DC, and smooth DC fault currents — essential for circuits with variable-speed drives, UPS systems, or PV inverters that can generate DC leakage. The short-time delayed characteristic (marked as short-time delayed / K-type in some references) provides selectivity against nuisance tripping from transient surges or inrush currents, making it suitable for sub-distribution boards where coordination with downstream RCCBs is needed.
The 70 mm installation depth matches the common 70 mm depth of distribution boards and enclosures — no extra clearance needed behind the rail. The housing is finger and back-of-hand safe per the protection against electrical shock rating.
The 300 mA residual rating is not for personnel protection (that requires 30 mA or less) — it is sized for equipment protection and fire prevention in circuits where a 30 mA device would nuisance-trip due to natural leakage from filters, drives, or long cable runs. The short-time delayed design (3 kA surge current resistance) lets it ride through lightning-induced surges or capacitor-switching transients without tripping, while still clearing a genuine earth fault. Silicon-free construction (product feature / silicon-free: Yes) matters for automotive paint-shop or semiconductor fab installations where silicone outgassing can cause adhesion or contamination issues. Mechanical service life of 10 000 switching cycles is typical for a protective device — not a contactor, so it is not intended for frequent operational switching.