It protects a single-phase final subcircuit against both overload/short-circuit (C-curve, 20 A rated) and earth leakage (30 mA, Type A). The C-curve tripping characteristic means it holds up to 5–10× In for short-duration inrush, making it the standard choice for mixed resistive and lightly inductive loads like socket circuits, lighting, and small appliances in commercial and residential distribution boards.
Rated breaking capacity is 4.5 kA according to EN 60898 and 5 kA according to IEC 60947-2. Either way, this RCBO is not intended for high-fault industrial mains — it belongs in a sub-distribution board downstream of a larger upstream protective device.
Width is 18 mm (1 modular unit), depth 77 mm, installation depth 70 mm. Mounting position is any — no restriction on upright, sideways, or inverted. The IP20 rating applies only once the distribution board is installed and conductors are connected; plan for the enclosure to provide the environmental seal.
Temperature derating — the real-world current
At 40 °C it derates to 19 A; at 45 °C to 18.4 A; at 50 °C to 18 A; at 55 °C to 17.4 A. If the distribution board runs warm — and most do, especially with high-density RCBOs packed side by side — the actual continuous current the device can carry without nuisance tripping is lower than the label. For a 20 A circuit loaded near its limit, keep the ambient inside the enclosure below 40 °C, or step up to a 25 A RCBO and protect with the same 20 A load.
Lifecycle status is current production. This is a standard catalogue part from the SENTRON family — no phase-out notice, no last-time-buy deadline.