The ABB 2CSB802201R5000 is a DDA802 residual current device (RCD) block from the DDA800 range. It assembles on site onto an ABB S800 series miniature circuit breaker and adds residual-current protection to that breaker's overcurrent protection. Building a board this way means the earth-fault function can be added only to the ways that need it, instead of holding a separate RCBO in every rating. It is 2-pole, rated 100 A, with a rated residual current of 1 A. Type A means it responds to sinusoidal AC residual currents and to pulsating DC residual currents, which is what circuits feeding electronic loads require. At 1 A it is intended for protection against earth-fault fire and for equipment protection, not for protection against direct contact — that requires a 30 mA device. This is the selective (S-type) version. It trips with a deliberate time delay so that an instantaneous RCD downstream clears the fault first and only the affected circuit is lost — the reason a selective device belongs at the head of a board rather than on a final circuit. Rated voltage 230 V AC; 240 V AC; 400 V AC. It fits S800S, S800N, S800C and S800B miniature circuit breakers. Supplied by cBallast on quote-to-invoice terms; lead time and freight are quoted per RFQ against the destination Incoterm.