Overvoltage protection device and overvoltage protection system

The invention relates to an overvoltage protection device and an overvoltage protection system, the device comprises a protection circuit connected in parallel with a protected device and a circuit breaker device, and the circuit breaker device is arranged in a common loop of the protection circuit and the protected device; the protection circuit comprises a circuit breaker driving circuit and a trigger circuit, the trigger circuit is connected with the control end of the circuit breaker driving circuit, and the trigger circuit is used for providing trigger voltage for the control end when the voltage at the two ends of the protection circuit is larger than a preset threshold value so as to trigger the circuit breaker driving circuit to be switched on. And the circuit breaker driving circuit is used for reducing the voltage at the two ends of the protection circuit after conduction and driving the circuit breaker to disconnect the common loop. According to the device, the threshold voltage can be flexibly set