Arc-fault detection unit block for SENTRON MCBs and RCBOs
The Siemens 5SM6024-2 is a SENTRON arc-fault detection device (AFDD) block designed to snap onto 1P+N miniature circuit breakers (5SY, 5SL4 series) and RCBOs (5SU1 series), converting them into combined arc-fault/overcurrent protective devices. It occupies 1 modular width unit (18 mm) on a DIN rail and is rated for 1–40 A at 230 V AC, 50 Hz.
What the ratings mean for fit
The 1–40 A current range covers the majority of final-circuit branch ratings in residential and light commercial panels. Because the AFDD block is designed specifically for 1P+N SENTRON breakers (5SY, 5SL4, 5SU1), it shares their 2-pole (1P+N) form factor and 2-module-width (36 mm) footprint when mated — the block itself is 1 MW wide. The 230 V AC, 50 Hz supply voltage matches standard single-phase mains in European and many Asian markets. Overvoltage category III and pollution degree 2 confirm suitability for fixed-installation distribution boards.
DIN-rail integration and panel fit
Mounts on a standard DIN rail (REG) in any position. Depth of 68.5 mm (with 70 mm installation depth) and 54 mm width per block. IP20 with the protective device and conductors connected — typical for enclosed distribution boards. Halogen-free and silicon-free construction, important for panels in environments sensitive to outgassing (e.g., data centers, clean rooms).
Environmental and compliance notes
Rated for ambient temperatures from -40 °C to 75 °C, with a derated maximum of 55 °C at 95% relative humidity. Mechanical service life of 10 000 operating cycles typical. The block is halogen-free and silicon-free per the spec. Overvoltage category III and pollution degree 2 match standard distribution-board conditions.