The T500 series single phase relay test kits are designed for easy and safe test of different type of relays. The powerful 250A/2000VA current source can be used to test all kinds of current relays, including high burden relay and CT. The AC/DC current and/or voltage sources allow phase angle and frequency to be adjusted smoothly. This makes it possible to precisely test directional and frequency relay. T200A is integrated with two current sources and thus can test differential relays easily. The kit uses advanced switching power amplifier to replace the traditional transformer, thus avoiding the dangerous high voltage across the current output.