The Siemens 5SU1654-7KV13 is an FI/LS protector (combined RCD/MCB) in a 1+N-pole form factor, Type A sensitivity per PSE/SSF requirements. The 70 mm module width fits standard DIN-rail distribution boards.
Type A detection means the device trips on sinusoidal AC residual currents and on pulsed DC residual currents up to 6 mA — the minimum needed for single-phase rectifier loads like switched-mode power supplies, LED drivers, and variable-speed drives on the line side. The 300 mA IΔn is a fire-protection threshold, not a personnel-protection threshold (30 mA is the touch-safe level); this unit is sized for circuits where the primary concern is cable insulation degradation or slow-developing earth faults, not direct human contact.
Deployment context
Snap-on DIN-rail mounting for 70 mm of panel width. The 1+N-pole arrangement switches the line conductor only; the neutral is switched internally for disconnection but not overcurrent-protected. Intended for single-phase final subcircuits in commercial or industrial distribution boards where Type A residual-current protection is specified by local wiring rules (PSE/SSF).