The FI block (RCU) is designed for customer-side installation with high-performance automatic circuit breakers from the S800 series. The resulting FI/LS combinations (RCBOs) offer property protection as well as protection against electrically ignited fires. They guarantee protection of 2P, 3P or 4P circuits against overload and short-circuit currents, protection against sinusoidal alternating currents and pulsating currents with a smooth DC residual current component of up to 6 mA against earth. As well as fault protection (protection against indirect contact), additional protection (with I¿n = 30 mA) and fire protection (with I¿n = 300 mA). They meet the product standard IEC/EN 60947-2. Areas of application are industrial applications. The extensive range of accessories offers you everything you need for your installation tasks.