Abstract: A portable switching device to remotely operate a high voltage circuit breaker, the portable switching device is locally temporarily electrically connected to the controlling circuit of the high voltage circuit breaker and comprises: a voltage input (206); a voltage output (208, 210) for connecting to the external circuit; a ground input (212); an overvoltage protection circuit (201) connected between the voltage input (206) and the ground input (212); and a switching unit (203, 205) comprising a first switching circuit having an input connected to the voltage input and an output connected to the voltage output, the first switching circuit comprising a relay (2032), a relay contact protection circuit (2034), and an overload protection circuit (2036); wherein the first switching circuit is remotely controllable to switch the external circuit from a first operating state to a second operating state.

Abstract: A portable switching device to remotely operate a high voltage circuit breaker, the portable switching device is locally temporarily electrically connected to the controlling circuit of the high voltage circuit breaker and comprises: a voltage input (206); a voltage output (208, 210) for connecting to the external circuit; a ground input (212); an overvoltage protection circuit (201) connected between the voltage input (206) and the ground input (212); and a switching unit (203, 205) comprising a first switching circuit having an input connected to the voltage input and an output connected to the voltage output, the first switching circuit comprising a relay (2032), a relay contact protection circuit (2034), and an overload protection circuit (2036); wherein the first switching circuit is remotely controllable to switch the external circuit from a first operating state to a second operating state.