RCDs are available from 25A to 100A in two and four pole versions with fixed sensitives ranging from 30mA to 500mA. Time delayed RCDs are also available to protect certain minor installations. MCBs are available in single, double and triple pole versions ranging from 6A to 100A. The Type B standard in generally used for final circuit protection and to protect the cable supplying a holiday home. Type D MCBs are generally used for motor control where a pump is being supplied. Switch disconnectors are available in double, triple and four pole versions and are used as single isolation points typically in distribution units. Current ratings of 100A, 125A, 160A or 200A are available and all units are din rail mounted to compliment the protective devices they accompany.