Overload protector with explosion-proof structure

Abstract

The invention discloses an overload protector having blast resistant construction. The overload protector comprises a main body portion equipped with a main body, an outer connecting terminal, a heating coil, a movable arm, a bimetal disc and a fixed contact frame; and a cover portion equipped with a cover and a pin connector. On a portion of the side wall of the overload protector, an opening isformed to be opposite to the outer end of the fixed contact frame of the main body portion or the outer end of the pin connector of the cover. The outer end of the pin connector is equipped with an electric arc holding portion for preventing the electric arc generated between the movable contact and the fixed contact leaking outside; the electric arc holding portion has a size larger than the size of the opening to cover the opening and bend downwards from the outside of the main body and the side wall of the cover.

Description

technical field [0001] The present invention relates to an overload protector with an explosion-proof structure, more particularly, to an overload protector with an explosion-proof structure that can prevent the surrounding combustible gas or steam from exploding, wherein the explosion is caused by arc leakage, and the arc leakage is Occurs when the contacts located inside the protector are switched on / off due to overload or abnormal operation of the compressor motor. Background technique [0002] Generally, as shown in FIGS. 1-5 , the overload protector 1 mainly includes a main body portion 10 and a cover portion 20 detachably coupled to the main body portion. [0003] The main body part 10 includes: a main body 11 having a plurality of recesses 11a and an opening (not shown); an external connection terminal 12 located on one side of the main body and electrically connected to an external power source; a heating coil 13 accommodated in the center of the main body 11 and ha...

AI Technical Summary

Problems solved by technology

Therefore, in the case where the overload protector 1 is mounted on a compressor (not shown), there is a great concern that the contact between the movable contact 14a and the fixed contact of the movable arm 14 will be damaged when the contacts 14a and 16a are turned on / off. The arc generated between the fixed contacts 16a of the bracket 16 leaks to the outside through the gap between the opening 1a of the main body 11 and the outer end 16b of the fixed contact bracket 16, causing the surrounding combustible gas or vapor to explode

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