The Siemens 5SU1154-7KK16 is a SENTRON RCBO combining residual current and overcurrent protection in a 36 mm wide, 2-module package. It protects a 1P+N circuit at 16 A, C-curve, 230/240 V AC, 50 Hz.
The higher IEC figure applies when the device is installed as a distribution circuit breaker (higher prospective fault current); the EN figure governs for standard final-circuit coordination. Residual sensitivity: Type A, 10 mA. Type A detects AC sinusoidal and pulsating DC fault currents, which covers most modern electronic loads (switched-mode power supplies, LED drivers, variable-speed drives with single-phase front ends). The 10 mA threshold is for wet-location or high-sensitivity circuits (e.g., bathrooms, outdoor sockets). That's a wide operating window — suitable for unheated enclosures or outdoor-rated panels in cold climates. Humidity tolerance up to 95 % means condensation-prone environments are manageable. Mechanical service life: 10 000 operating cycles typical. For a residential or light commercial RCBO, that's standard — expect the residual-current test button to be exercised periodically per local code, but the main switch contacts are rated for the full 10k cycles under load.
Width is 2 modular units (36 mm), depth 77 mm, installation depth 70 mm. IP20 with connected conductors (typical for enclosed distribution boards).