The Siemens 5SU1156-6KV13 is a combined residual current device and miniature circuit breaker (RCBO) — an FI/LS protector — in a single 1+N-pole module. It carries a Type A (PSE/SSF) residual current sensitivity of 10 mA and a B-curve overcurrent trip at 13 A, with a short-circuit breaking capacity of 6 kA. The 70 mm depth is standard for Siemens 5SU series RCBOs, fitting directly into the same DIN-rail distribution boards as the SENTRON family.
The 10 mA IΔN is the key spec for personnel protection in wet or medical locations — it's the threshold that catches leakage through the human body before fibrillation risk escalates. Type A detection means it responds to pulsating DC fault currents (rectified from AC waveforms), not just pure sinusoidal AC; that covers modern switched-mode power supplies, variable-speed drives, and LED drivers. The B-curve overcurrent trip at 13 A means the magnetic release operates at 3–5× In (39–65 A), sized for resistive and lightly inductive loads like lighting circuits or control transformers — not for motor starting inrush. In a panel with higher fault capacity upstream, the 5SU1156-6KV13 needs a back-up fuse or upstream MCB with a lower let-through to ensure coordination.
The 1+N-pole format occupies a single module width (18 mm per pole, so 36 mm total for the 1P+N unit). Neutral is switched and protected — the right-side terminal is the switched neutral. Wire size: 1–25 mm² for the line/load terminals, with a combined busbar fork compatible with the Siemens 5SU/5SL busbar system.