The Siemens 5SU1656-7KK16 is a SENTRON RCBO — a combined residual-current device and miniature circuit breaker in a 1P+N, 2-pole package. Rated 16 A at 30 °C with a C tripping curve, it handles overcurrents and earth faults in a single 36 mm wide module. The interrupting capacity is 6 kA per EN 60898 and 15 kA per IEC 60947-2, giving it a solid safety margin for residential and light commercial distribution boards.
The 16 A rating holds at 30 °C ambient; above that, the current must be derated stepwise: 15.2 A at 40 °C, 14.4 A at 50 °C, 13.6 A at 60 °C, and 12.32 A at 70 °C. The device is 36 mm wide (2 modular width units), 77 mm deep, with an installation depth of 70 mm, and can be mounted in any position.
Halogen-free and silicon-free construction, which reduces toxic gas emission in a fire and avoids silicone contamination in sensitive environments like clean rooms or coating lines. The insulation voltage is rated 264 V, surge voltage resistance 4 000 V.