Trip mechanism for surge protectors and surge protectors

Abstract

Provided are a tripping mechanism for use in a surge protector and the surge protector comprising the tripping mechanism. The tripping mechanism (100) comprises a frame bracket (110) for use in holding at least one metal oxide rheostat (200), a tripping rod (120) pivotably arranged on the frame bracket and connected to one electrode (210) of the metal oxide rheostat via a low-temperature solder, and a slidable block (120) slidably arranged on the bracket frame between a first position and a second position and biasly pressed towards a tripping position. In a normal working state, the slidable block is maintained at the first position by the tripping rod countering the biasing pressure. In a tripped state, the slidable block slides towards the second position under the effete of the biasing pressure, causing the tripping rod to pivot along the direction away from the electrode of the metal oxide rheostat. Because the tripping mechanism pivots away from the electrode of the metal oxide rheostat when in the tripped state, the electrical o distance between the tripping rod and the electrode is thus increased, and the reliability of electrical insulation between both is thus improved.

Description

technical field [0001] The present invention relates to a surge protector, and more particularly to a tripping mechanism for the surge protector. Background technique [0002] Surge protectors are widely used in electrical lines in homes, offices, and industrial places to prevent damage to electrical equipment caused by instantaneous overvoltage in the line. When the electrical circuit or communication line suddenly generates peak current or voltage due to external interference, the surge protector can conduct the shunt in a very short time, so as to avoid the damage of the surge to other equipment in the circuit. [0003] In the most commonly used surge protectors, a component called a metal oxide varistor (MOV) is included to divert excess voltage. The metal oxide varistor has a very large resistance under normal operating conditions, thus, it is basically in an open circuit state, and when the voltage in the circuit exceeds a predetermined value, for example, in the even...

AI Technical Summary

Problems solved by technology

[0009] However, this conventional surge protector tripping mechanism has the following problem: the tripping bar 1 basically moves in a plane parallel to the side of the MOV 5, and therefore, even when the tripping bar 1 trips, the tripping The electrical distance between rod 1 and the electrodes of MOV5 is very short, which is not conducive to the electrical isolation between the two in the case of tripping

However, when the temperature rises, since the two trip levers 1 work independently, it is difficult for the tripping mechanism of the above-mentioned prior art to satisfy the synchronous tripping requirements of the two MOVs.

If the two MOVs cannot be guaranteed to trip at the same time, for example, one does not trip and the other trips in the above example, that is, a 20kA standard single-chip MOV may cause a MOV explosion in a 35kA surge environment.

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