The Siemens 5SU1656-6KK13 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) rated 13 A at AC, with a Type A residual current sensitivity and a B-curve instantaneous trip characteristic. It occupies 2 modular width units (36 mm) on a DIN rail and is rated for 6 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2, giving it a solid fault-clearing margin for most residential and light commercial panelboards.
Mounts in any position on a DIN rail with an installation depth of 70 mm and a total depth of 77 mm. The 1P+N configuration (switched phase, solid neutral) fits standard single-phase final circuits. Supply can enter from either top or bottom, which simplifies panel wiring when busbar routing is tight. IP20 rating applies when installed in a distribution board with connected conductors — standard for enclosed panel use, not for wet or outdoor locations without an additional enclosure.
Temperature derating is published for this unit: at 40 °C ambient the rated current drops to 12.48 A, at 50 °C to 11.96 A, and at 70 °C to 10.01 A. If the panel runs hot — near a transformer or in a non-ventilated enclosure — size the circuit load against the derated figure, not the 13 A nameplate.
Halogen-free and silicon-free construction matters for environments sensitive to outgassing — clean rooms, food processing, or areas with sensitive contacts. The part carries pollution degree 2 and overvoltage category III ratings, suitable for fixed-installation final circuits.