Heat protection pressure sensitive resistor module

Abstract

The invention provides a thermal protection voltage-sensitive resistor module used for surge protection, which consists essentially of a metal oxide voltage-sensitive resistor, a thermal response switch, a set of thruster with a compression spring and a wedge-shaped quencher and a case. Thermal coupling exists between the thermal response switch and the metal oxide voltage-sensitive resistor. When the metal oxide voltage-sensitive resistor is overstressed, the resistor emits heat, the thermal response switch can immediately sense the heat and soften the welding point of solder with low melting point, then the welding point is forced to be quickly disconnected and part of the wedge-shaped quencher is inserted into the clearance at the breakage place of the welding point under the joint effect of the thruster with the spring and the wedge-shaped quencher and the resilient conductive connection arm, thus the quenching effect is enhanced.

Description

technical field [0001] The present invention relates to a thermal protection varistor module, in particular to a surge protection device or a transient voltage surge protection device used in a power supply system with a compression spring and a wedge-shaped arc extinguisher. varistor module for thermal protection of the tor. Background technique [0002] Currently, metal oxide varistors (hereinafter referred to as MOVs) are widely used in surge suppression devices. Usually the MOV is electrically connected directly between the phase line and the ground or neutral line to dissipate the voltage surge energy that appears on the line. However, during the working process of the MOV, it may be subjected to various external stresses, such as temperature stress, surge energy stress or temporary overvoltage stress, etc. When the MOV is subjected to overstress, that is, when the rated value of the MOV is exceeded, the characteristics of the MOV may degrade, resulting in increased l...

AI Technical Summary

Problems solved by technology

Although the use of this MOV in the surge protector circuit can separate the failed MOV from the power supply circuit, and to a certain extent, can prevent the fire of the surge protector, but its disadvantage is that , Sometimes, when the thermal protection contact is disconnected, an arc is generated between the gaps formed after the disconnection. If the arc is not extinguished, the large accident current from the power supply may continue to be maintained, and the surge protector is still on fire. possibility of

Images