The Siemens SENTRON 5SM3318-6KK is a 2-pole residual current operated circuit breaker (RCCB), Type A, rated for 100 A continuous load and 30 mA residual current sensitivity on a 230 V AC, 50 Hz supply. The 100 A rating sizes it for a main incoming supply or a high-load submain, not a branch circuit. The conditional breaking capacity per EN 60898 is listed at 1 kA when backed by an overcurrent protective device, which is the coordination value for standard domestic back-up fuses or MCBs. The 2-pole design switches both line and neutral. Mounting is on DIN rail (REG), width 2 modular units (36 mm). Depth is 70 mm, height 90 mm. The enclosure rating is IP20 only when installed in a distribution board with all conductors connected — the terminals are not touch-safe exposed. Silicon-free construction is a bonus for applications where silicone outgassing can contaminate contacts or optical surfaces, such as paint shops or clean-room adjacent panels.
The 70 mm installation depth matches the standard SENTRON distribution board depth — no need for a deeper enclosure. The instantaneous design trips on the first half-cycle of a residual fault.