What it is and what it does
The Siemens 5SU1354-6KV10 is a combined residual-current device and miniature circuit breaker — an FI/LS protector — in a single 1+N-pole module. It integrates Type A earth-leakage detection at 30 mA with a B-curve overcurrent trip rated at 10 A, all in a 70 mm-wide housing. The 10 kA breaking capacity covers the majority of domestic and light commercial distribution boards where the prospective short-circuit current stays under that threshold.
What the ratings mean for fit
The Type A classification means this device detects AC pulsating DC earth faults and smooth DC residual currents up to 6 mA — required on circuits feeding single-phase rectified loads like washing machines, LED drivers, or IT equipment. The 30 mA rated residual operating current (IΔn) is the standard for personal protection against direct contact in most IEC 60364 installations. The B-curve overcurrent characteristic (10 A rated current) trips between 3 and 5 times In, sized for resistive and moderate inductive loads such as lighting circuits, socket outlets, and small appliances. The 10 kA rated short-circuit capacity (Icn) matches the typical domestic utility-side fault level; verify the prospective short-circuit current at the installation point does not exceed this value.
Panel integration
The 70 mm module width (4 module spaces on a standard 18 mm DIN rail) fits standard distribution boards and consumer units. The 1+N-pole configuration switches the line conductor only; the neutral is switched internally for isolation but is not overcurrent-protected. Wire terminations accept solid or stranded copper conductors typical of final subcircuits. No auxiliary contact or shunt-trip accessory is integrated — external add-on modules from the Siemens 5SM series can be fitted for remote signaling or undervoltage release.