The ABB 2CSB803401R1000 is a DDA803 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 3-pole, rated 100 A, with a rated residual current of 30 mA. 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 30 mA it is rated for protection of people against electric shock, which is the sensitivity required for socket outlets and other circuits where direct contact is foreseeable. This is the APR high-immunity version, which trips with a 10 ms delay. The delay lets it ride through the brief leakage surges produced by switching, by long cable runs and by the input filters of electronic equipment, instead of nuisance-tripping on them. Rated voltage 400 V AC; 415 V AC; 690 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.