The Siemens 5SU1354-1LV32 is a combined residual-current device and miniature circuit breaker (FI/LS protector) in a single 1+N-pole module. It combines 30 mA type AC earth-leakage protection with a C-curve 32 A overcurrent trip, rated for 10 kA breaking capacity per IEC 61009. The G-type designation means it's selective (time-delayed) against nuisance tripping from transient surges or inrush currents — useful on circuits feeding motor loads or capacitive supplies where a standard instantaneous RCD would drop out on start-up.
What the ratings mean for fit
The 30 mA residual sensitivity covers personnel protection (indirect contact) per IEC 60364, while the 10 kA breaking capacity handles fault currents up to that level without upstream cascading — verify the prospective short-circuit current at the installation point. The C-curve (32 A rated current) is sized for moderate inrush loads like small motors, pumps, or lighting banks; a B-curve would trip faster on lower surges, but the C-curve avoids nuisance trips on the expected load profile. The G-type (time-delayed) selectivity means this unit can be installed downstream of a time-delayed main RCD without losing coordination — the main RCD sees the fault first and clears it, leaving this device untripped.
Deployment context
The 1+N-pole format (switched phase + switched neutral) fits standard DIN-rail enclosures — common in residential and light commercial distribution boards where both poles need isolation. The 70 mm depth (D=70mm) is the standard module width for a 1+N RCBO, so it occupies one 18 mm slot plus the neutral pole width. No special panel cut-out or adapter needed; it snaps onto the DIN rail and buses into the neutral bar.