The Siemens 5SU1354-7KV16 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS-protector Type A with a 30 mA trip sensitivity and a 10 kA short-circuit breaking capacity, in a 1+N-pole C 16 A thermal-magnetic curve. The Type A designation means it detects sinusoidal AC and pulsating DC residual currents, which covers most single-phase loads with electronic rectifiers. The 30 mA IΔn is the standard threshold for personal protection against indirect contact in final circuits per IEC 60364.
The C 16 A curve trips between 5× and 10× rated current (80–160 A magnetic release), so it is sized for resistive and moderate inductive loads like lighting, socket outlets, and small motor circuits where inrush is not extreme. The 1+N-pole configuration switches the line conductor and provides residual-current detection on both line and neutral, but the neutral pole is not switched — it is a solid neutral bar. The 70 mm width (4 module spaces) is standard for DIN-rail mounting in a consumer unit or sub-distribution board.