Abstract: A modular surge protector includes a shell, a discharge tube unit, a first varistor unit and a second varistor unit, where the discharge tube unit, the first varistor unit and the second varistor unit are arranged in the shell. The first varistor unit and the second varistor unit are stacked, the discharge tube unit is provided at a same side of each of the first varistor unit and the second varistor unit, a first electrode is led out from the first varistor unit, a second electrode is led out from the second varistor unit, and a third electrode is led out from the discharge tube unit. Three frames are provided for the discharge tubes and the varistors to form the modular design. With the vertical discharge tubes and the horizontal varistors, the modular surge protector has a compact structure and meets the requirements of miniaturization applications.

Abstract: A modular surge protection device (SPD) is provided. The modular SPD includes an overvoltage protection component, and a trip mechanism for disconnecting the SPD, where the overvoltage protection component is provided with a pin electrode; the overvoltage protection component includes a voltage switching element; and the trip mechanism is provided on the voltage switching element. The SPD can ensure no action of the trip mechanism in response to a surge in a high-temperature environment, and does not affect the action time of the trip mechanism in response to an abnormal overcurrent.