Technical specifications of components such as varistors, capacitors, resistors, circuit breakers, connectors, insulation, protection relays, etc. are defined in the data sheets of the manufacturers. Tests and measurement must be carried out to verify the technical data of components guaranteed in the data sheets. Depending on the component type the test must be carried out during the manufacturing process or as a type test in an accredited test house. A set of components with the same rating must be tested. The test time increases with the number of components. Therefore the test equipment is very often customised with automatic handling, testing and passed/failed decisions.