What this RCBO carries
Type A detection means it trips on sinusoidal AC and pulsating DC residual currents — the minimum for circuits feeding single-phase electronics, switch-mode supplies, or variable-speed drives where pure AC-only (Type AC) protection would miss a fault. The C20 curve (C characteristic, 20 A rated current) handles moderate inrush from motorized loads or capacitive banks without nuisance tripping, while the 30 mA residual threshold provides personal protection against direct-contact faults.
Snap-on DIN rail mounting, 2-module width. Verify busbar compatibility (Crabtree Polestar range uses a specific busbar pitch and fork profile) before ordering for a retrofit.