It is a Type A, instantaneous design — no intentional delay, so it clears ground faults as fast as the waveform allows. Two poles, 50 Hz only, DIN rail mount, 2 MW wide (36 mm).
Above that, the part derates linearly: 38.1 A at 45 °C, 35.59 A at 50 °C, down to 17.6 A at 70 °C. If your panel runs hot, check the thermal curve — at 60 °C you only get 28.19 A continuous. The 300 mA sensitivity is standard for general-purpose socket circuits and lighting in commercial or industrial distribution boards; it avoids nuisance tripping from normal leakage in long cable runs. Short-circuit current rating is 10 kA per IEC 61008-1 and 0.5 kA per EN 60898 — the lower EN value governs when the RCCB is used as a standalone device without upstream overcurrent protection coordination. Surge current resistance is 1 kA (8/20 µs), letting it withstand lightning-induced transients without false tripping. Type A detection covers sinusoidal AC residual currents and pulsating DC residual currents.
Mounting and installation
Snaps onto DIN rail (REG). Mounting position any. Feed from top or bottom. Depth 70 mm, height 90 mm.