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.
What the ratings mean for fit
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 10 kA breaking capacity at 230/400 V is sufficient for most residential and light-commercial distribution boards where the prospective short-circuit current stays under that threshold. 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.