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  • Testers designed to assess the electrical characteristics of circuit breakers, usually by means of current injection. These testers typically consist of a high-output current source, a high-accuracy ammeter, a multirange timer, overload protectors, a display, and controls; some testers include additional measuring capabilities (e.g., time delay, trip current) to test devices such as overload relays and/or ground-fault interrupters.
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