Rated at 100 A (at 30 °C ambient) with a 300 mA residual fault current threshold, it provides both earth leakage and short-circuit/overload protection in a single modular device — a space-saving choice for distribution boards where separate RCCB and MCB would consume more width.
Type B residual current and D-curve overcurrent — what they mean for the installation
Type B residual current detection covers smooth DC, pulsating DC, and AC residual currents — essential where variable-frequency drives, UPS systems, or rectifier loads are downstream, since those can generate DC fault currents that Type A or AC devices cannot detect. Temperature derating is published: 100 A at 30 °C, 92.5 A at 40 °C, 89 A at 45 °C, 85 A at 50 °C, 81 A at 55 °C, and 77 A at 60 °C — the panel designer must apply these when the RCBO is enclosed or in a warm environment.
Width is 198 mm (11 modular width units), depth 77 mm, height 90 mm, with an installation depth of 70 mm — it occupies a standard DIN-rail footprint but at 11 MW is wider than a typical 4-pole MCB (usually 4 MW), so verify available rail space before panel layout. Mounting position is any; supply can enter from top or bottom, which simplifies busbar and cable routing in crowded enclosures. IP20 rating applies when installed in a distribution board with connected conductors — the RCBO itself is not sealed for wet or dusty environments; it belongs inside a panel.