Type A residual detection catches pulsating DC fault currents (typical from rectified loads like switched-mode supplies, LED drivers, or VFD front-ends) that a plain AC-sensitive RCD would miss. The 1+N form factor — switching both line and neutral, with overcurrent protection on the line pole only — fits the common single-phase final-circuit layout in European-style distribution boards.
Panel integration
Snap-on DIN rail mount, 2-module width (36 mm). The Construction line uses the same busbar comb footprint as the standard 5SY MCBs and 5SM RCCBs, so it slots into an existing distribution board layout without re-drilling or re-bussing. Neutral bar connection on the right-side terminal; line in at top, load out at bottom — standard wiring order for a 1+N RCBO.