Shielding and insulating surge protection device

Abstract

The invention discloses a shielding insulation type surge protection device for surge protection, which includes an arc shielding mechanism composed of a retainer, a tripping swing arm and an elastic member, a thermal response switch assembly, a voltage sensitive assembly and a support Functional base. When the surge protection device operates quickly due to factors such as surges on the line, it can reliably block the short-circuit arc caused by the action of the thermal response switch and ensure that the protection device is completely separated from the line.

Description

technical field [0001] The invention relates to a surge protection device, in particular to a shielding insulation type surge protection device. Background technique [0002] Surge protection device is an electronic circuit protection device that suppresses surge overvoltage, and it is an effective surge protection method in power supply system and electronic equipment surge protection. [0003] Existing surge protection devices generally adopt the form of a square metal sheet perpendicular to the plane of the voltage sensitive element. For example, Chinese Patent No. 201210302174.4 discloses a secondary tripping surge protector and Chinese Patent No. 201420741083.5 discloses a surge protector. The design of the protector's thermal detachment device, this kind of electrode extension method has a large air contact area, which is easy to dissipate heat, and because there is no intermittent flow function, the detachment mechanism needs to move a long distance to cut off the pow...

AI Technical Summary

Problems solved by technology

[0003] Existing surge protection devices generally adopt the form of a square metal sheet perpendicular to the plane of the voltage sensitive element. For example, Chinese Patent No. 201210302174.4 discloses a secondary tripping surge protector and Chinese Patent No. 201420741083.5 discloses a surge protector. The design of the protector's thermal detachment device, this kind of electrode extension method has a large air contact area, which is easy to dissipate heat, and because there is no intermittent flow function, the detachment mechanism needs to move a long distance to cut off the power supply to ensure that the arc generated during its arcing action extinguished, resulting in a safety hazard of power supply and protection device failure

In practice, because the mechanical detachment stress acting on the square metal sheet is in the vertical direction of the welding surface of the metal sheet, the failure rate of this type of surge protection device is relatively high during operation, and it is easy to cause power supply and equipment accidents.

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