The Siemens 5SU9304-7PK16 is a SENTRON RCBO (residual current operated circuit breaker with overcurrent protection) combining a Type A residual current device (30 mA) and a C-curve miniature circuit breaker (16 A) in a single 1P+N, 2-pole module. It is rated for 230/240 V AC at 50/60 Hz and delivers a 10 kA breaking capacity according to both EN 60898 and IEC 60947-2 — sufficient for most residential and light commercial distribution boards where fault levels stay under that threshold.
What the ratings mean for fit
The C-curve (tripping between 5× and 10× In) and 16 A rated current at 30 °C mean this RCBO is sized for general-purpose lighting, socket-outlet, and small-appliance circuits where inrush from motorized loads or capacitive switching is moderate. The 30 mA residual sensitivity (Type A) covers sinusoidal AC fault currents plus pulsating DC fault currents up to 6 mA — the standard for circuits supplying single-phase electronics, computers, or appliances with rectifiers. At 18 mm wide (1 modular unit) and 77 mm deep, it snaps onto a DIN rail and fits a standard 70 mm installation depth enclosure. The IP20 rating applies only when the distribution board is installed with conductors connected — meaning the front face is touch-safe, but the unit is not sealed against moisture ingress; it belongs inside a panel, not in a washdown zone. Supply can enter from either top or bottom, and the solid neutral (switched) is integral to the 1P+N design — no separate neutral bar needed downstream. The 1200 mm pigtail simplifies wiring in pre-fabricated distribution boards.