Protective devices such as over current relay, short circuit relay, circuit breakers and CTs etc must be checked and calibrated regularly to ensure that they are always ready to operate correctly. Current injection testing sets will help detecting faulty or incorrectly adjusted protection circuit / device and thereby avoid damage to the system. With the help of current injection test sets the correct functioning of protective device / circuit is ensured. The units are available in single phase version for small capacity and single or two phase version for higher capacities.