What it is and what it does
The Siemens 5SU1656-7KK10 is a SENTRON RCBO — a combined residual-current circuit breaker with overcurrent protection — in a 1P+N configuration, meaning it switches the live conductor and monitors the neutral, but does not switch the neutral. It carries a 10 A rated current at 30 °C with a C tripping characteristic (magnetic release at 5–10× In), and a 300 mA Type A residual-current trip that catches sinusoidal AC and pulsating DC fault currents. The breaking capacity is 6 kA per EN 60898, which covers most residential and light commercial distribution boards where the prospective short-circuit current stays under that level.
Temperature derating and real-world current
The 10 A rating holds at 30 °C ambient. At 40 °C it derates to 9.5 A, at 50 °C to 9 A, and at 70 °C to 8 A. If the distribution board runs warm — say 50 °C inside the enclosure — the continuous load should be capped at 9 A to avoid nuisance tripping. The device is rated for any mounting position, which simplifies panel layout, and the supply can enter from top or bottom.
Physical fit and panel integration
This RCBO occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 77 mm and an installation depth of 70 mm. The IP20 rating applies once the distribution board is installed with connected conductors — standard for enclosed panels. It is halogen-free and silicon-free, which matters in clean-room or sensitive electronic environments where outgassing can cause contact corrosion.