Patent ID: 6545479
Filing Date: 2003-04-08
Classification: G01R

Abstract:
A circuit breaker tester for testing a current transformer of a circuit breaker, the current transformer having a first terminal on a first end of the transformer and a second terminal on a second end of the transformer, comprising:a housing configured to be held in a hand; a test port coupled to the housing and configured to be coupled to the first and second terminals; a test circuit coupled to the test port and configured to provide a test current through the test port to the first terminal, to monitor the second terminal through the test port, and to provide an output signal to an indicia based on whether the test current is received at the second terminal, and further comprising: a second current transformer of a three-phase circuit breaker, the second current transformer having a third terminal on a first end of the second current transformer and the second terminal on a second end of the second current transformer, wherein the test port is further configured to be coupled to the third terminal, and the test circuit is further configured to provide the test current through the test port to the third terminal, to monitor the second terminal through the test port, and to provide an output signal to the indicia based on whether the test current is received at the second terminal in response to providing the test current at the third terminal.