The Siemens 5SU1653-7KV13 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS-protector Type A per the description, with a 300 mA rated residual operating current (IΔn) and a 4.5 kA short-circuit breaking capacity. The 1+N-POL configuration switches the line and neutral, with a C-trip characteristic at 13 A, so it handles motor-starting inrush and moderate inductive loads without nuisance tripping on a standard 230/400 V supply. Type A detection means it catches pulsating DC fault currents on top of AC sinusoidal residuals — common on single-phase rectifier loads like switched-mode power supplies, VFDs, or LED drivers. The 300 mA threshold is above the 30 mA required for personal protection, so this unit is sized for equipment and fire protection rather than direct touch protection.
The 70 mm depth (D=70mm) fits standard consumer-unit enclosures and sub-distribution boards. The 1+N-POL format occupies a single module width, so it replaces a separate RCD + MCB pair in the same slot count.