The Siemens 5SU1353-7KV13 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS-protector in Siemens' 5SU1 series. It packs Type A earth-leakage detection (30 mA sensitivity) and a C-curve overcurrent trip (13 A) into a single 1+N-pole module, rated to break 4.5 kA at the short-circuit level. That 70 mm width (roughly 4 standard DIN modules) means it fits a standard distribution board slot, but plan your enclosure fill — it's wider than a single-pole MCB.
What the ratings mean for fit
The 30 mA IΔn is the standard threshold for personal protection against direct contact in residential and commercial final circuits (EN 60364-4-41). Type A detection handles pulsating DC residual currents from rectifiers or power supplies — common with modern electronics, washing machines, LED drivers. The C-curve (13 A) means the magnetic trip activates at 5–10× rated current, suited for loads with moderate inrush like small motors, pumps, or fluorescent lighting banks. The 4.5 kA breaking capacity (Icn) is the standard domestic/commercial short-circuit rating per EN 61009-1; it's adequate for most sub-distribution boards but undersized for industrial main panels where 10 kA or higher is typical.