Patent ID: 9140756
Filing Date: 2015-09-22
Classification: G01R

Abstract:
1. A measuring device for checking an electrical circuit breaker, the measuring device comprising: a current generating unit configured to generate a measurement current for a continuity measurement of a switching contact of the circuit breaker, a measuring unit coupled to the circuit breaker and configured to detect a measurement signal at the circuit breaker, an energy supply unit configured to supply a control drive with electrical energy for the purpose of opening or closing the circuit breaker, a control output coupled to the control drive of the circuit breaker and which is configured to output signals to open and/or close the circuit breaker, and a control unit, which has a timer and which is configured to output, via the control output, a signal to open or close the circuit breaker, and to determine a time-based switching behaviour of the circuit breaker in dependence on the measurement signal and, in the case of the circuit breaker being closed, to determine the resistance of the switching contact in dependence on the measurement current and the measurement signal.