ISA is a worldwide manufacturer and supplier of automatic protection relay test systems: the leading edge technology and reliability of ISA three phase relay test sets can fulfil all the customer testing needs. ISA protective relay test set are designed to accomplish measurement and test for transducers, energy meters and power quality meters. ISA range of products includes also relay test equipments with IEC 61850 Communication protocol interface and secondary injection test set endowed with different features: the wide choice granted to commissioning engineers and the extreme robustness of its testing devices confirm ISA as one of the biggest world leader in power system protection testing.