Federal Pioneer DDT-USD Secondary Current Injection Relay Tester

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The Federal Pioneer DDT-USD Secondary Relay Tester is a legacy unit designed for secondary current injection testing of USR and USRC relay units. This unit can evaluate the entire tripping system, including the SSD device, current sensors, and the trip device solenoid. To further enhance testing abilities the DDT-USD is also capable of switching to both AC and DC modes. Designed with a digital readout and easy to use controls, this unit is a valuable tool for testing and diagnosing older SSD overcurrent trip devices.