Surge protection device

A surge protection device, comprising:

• a power input port, connected to a voltage source;
• a power output port, connected to the load;
• a switching element, connected to the power output port;
• a voltage measurement circuit, connected to the power input port, and
• configured to generate a voltage measurement signal based on an input voltage signal of the voltage source;
• a processing circuit, connected to the voltage measurement circuit and the switching element, and configured to control the switching element to be turn on when the processing circuit determines that the input voltage signal is in a normal state based on the voltage measurement signal, to make the voltage source supply power to the load;
• and
• a switch control circuit, connected to the voltage measurement circuit and the switching element, the switch control circuit including a comparator circuit;
• the comparator circuit configured to compare the voltage measurement signal with a voltage threshold, to control the switching element to be turned off when it determines that the input voltage signal is in a surge state, so that the power output port is powered off.