Type of residual current BType B residual current circuit-breakers are AC-DC sensitive.Type of residual current BType B residual current circuit-breakers are AC-DC sensitive. Categories Downloads Manual Manual RCDs Type B - [ 2900 KB ] Basic design Standard RCCBs are designed for circuits with 230/400 V at 50 Hz. special voltages / frequencies Devices in these special versions are designed for monitoring electric… Technical informationsType B residual current circuit-breakers are AC-DC sensitive.