Thin circuit protection device

Abstract

The invention relates to a thin circuit protection device which comprises a hollow cavity formed by an upper shell and a lower shell, a breakable circuit consisting of a movable electrode, a movable contact, a fixed contact and a fixed electrode which are connected in series with one another, a macromolecular PTC (positive temperature coefficient) element and a bimetallic strip, wherein the upper shell consists of an upper metal insert and an upper plastic piece; reinforcement ribs are arranged on the upper metal insert, and reinforcement ribs matched with the upper plastic piece are also arranged on the upper plastic piece; the lower shell consists of a lower metal insert with a lead-out end and a fixed contact and a lower plastic piece; two clamping slots are formed in the ends, which are close to the outer wall, of two sides of the lower plastic piece; three embedding hooks are respectively arranged on a frame defined by three adjacent side edges, which are connected with the lower plastic piece, of the lower metal insert; the lower metal insert is embedded into the lower plastic piece through the embedding hooks; two bent parts are arranged at the middle section of the movable electrode along the direction perpendicular to the plane of the movable electrode; during mounting, the bent parts extend into the clamping slots of the lower plastic piece to press against the outer wall. The structural intensity of the thin circuit protection device disclosed by the invention is enhanced, and the reliability of the use of a product is improved.

Description

technical field [0001] The invention relates to a circuit protection device, in particular to a thin circuit protection device involving both a bimetal sheet and a PTC element. Background technique [0002] A protection device including a bimetal strip and a PTC element has been applied to electronic circuit protection. The protective device in the prior art usually includes a plastic shell, and components such as bimetallic strips, PTC elements, contacts and the like assembled in the plastic shell. Due to the trend of miniaturization and thinning in the electronics industry, circuit protection devices are also facing the same requirements. Therefore, the external dimensions and structural design of each component included in the circuit protection device are limited. For example, due to the limitation of the total thickness of the device, the thickness of the plastic injection molding layer and the thickness of the metal insert are all limited. Therefore, one of the resul...

AI Technical Summary

Problems solved by technology

[0006] In addition, the lead-out end of the movable electrode is connected to the external circuit, which is easy to be pulled out during use, resulting in poor contact coordination and reduced working reliability

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