The Type A-SI (Super Immunised) designation means the residual-current detection is filtered to ignore high-frequency leakage currents that would nuisance-trip a standard Type A device. This matters on circuits feeding variable-speed drives, UPS systems, or switch-mode power supplies where normal operating leakage contains harmonics and high-frequency components.
Integration notes
Terminals accept up to 10 mm² flexible or 16 mm² rigid cable — tunnel-type, so strip length and ferrule selection follow standard practice for RCBOs. The toggle control provides local ON/OFF indication and a contact position indicator for visual confirmation of state. Rated for 20000 electrical cycles and 20000 mechanical cycles per IEC 61009, which covers the duty cycle of a distribution outgoer in a typical panel. Environmental limits: storage from -40 to 60 °C, operating altitude up to 2000 m, and 95 % relative humidity at 55 °C. Tropicalisation class 2 per EN 61009 and pollution degree 3 mean it is rated for environments with conductive pollution or occasional condensation — typical of industrial enclosures not fully climate-controlled.