It packs Type A residual-current detection at 10 mA IΔn together with a C-curve 16 A thermal-magnetic overcurrent trip into a single 1+N-pole module. The 10 mA sensitivity catches leakage paths that a standard 30 mA device would miss, making it the right choice for circuits supplying wet locations or medical equipment where earth-leakage thresholds are tighter.
The 70 mm depth (D=70 mm) means it fits flush in most European enclosures without protruding past the cover. The 1+N-pole format switches and protects the phase conductor while the neutral bar passes through a solid link — no neutral protection, which is standard for TN-S and TN-C-S systems where the neutral is bonded at the source. The Type A residual-current characteristic handles pulsating DC fault currents from rectified loads (switched-mode supplies, LED drivers, single-phase VFDs) that a Type AC device would not detect.