Grid-connected and off-grid switching energy storage system circuit breaking device

The invention relates to a grid-connected and off-grid switching energy storage system circuit breaking device, which is provided with a circuit breaker and a no-voltage release, and is also provided with a grid-connected and off-grid mode change-over switch which is arranged in a grid-connected mode when the grid-connected and off-grid mode change-over switch is respectively and independently connected with different lines and normally supplies power in a grid; when a power grid loses power, the grid-connected and off-grid mode change-over switch is in an off-grid mode, so that the circuit breaker can be normally switched on to run in an on-load off-grid mode; the no-voltage tripping detection point is used for detecting the voltage of the upper port of the no-voltage tripper when the power grid normally supplies power; when the power grid loses power, the voltage detection circuit is used for detecting the voltage of the lower port of the no-voltage release. According to the energy storage system circuit br