The 100 mA sensitivity makes it suitable for circuits where a higher trip threshold is needed to avoid nuisance tripping from leakage currents — think longer cable runs or equipment with inherent leakage, while still providing personnel protection against direct contact. The short-time delayed design (type S or selective) coordinates with downstream RCCBs, letting the closer device trip first on a fault and keeping this unit as backup — essential for selectivity in multi-level distribution.
Snaps onto standard DIN rail (REG), occupies 4 width units (about 72 mm). Installation depth is 70 mm. Terminals accept solid or stranded conductors from 1.5 to 25 mm²; tighten to 2.5–3 N·m. Rated IP20 with the distribution board installed and conductors connected — it's a panel-internal device, not for wet or outdoor locations.
The built-in thermal overload protection adds a layer of backup for sustained overcurrents, though this is an RCCB, not an MCB — it's not rated for short-circuit interruption (0 kA SCCR). Upstream overcurrent protection is required.