A self-locking power-off delay protector

Abstract

The invention discloses a self-locking power-off time delay protector in the field of electric components. The self-locking power-off time delay protector comprises a shell with an opening in one end, wherein an overcurrent and overheat protection assembly is arranged in the shell; the end part of the overcurrent and overheat protection assembly is connected with two paths of wires which extend out from the opening; the opening of the shell is sealed through a sealant; the overcurrent and overheat protection assembly comprises a static wafer, a movable wafer and a thermal bimetallic strip arranged in an insulating support seat; a groove is formed in the insulating support seat; a PTC ceramic heating block connected with the static wafer is arranged in the groove; a U-shaped groove is formed in the middle of the thermal bimetallic strip, and a pressing sheet is formed in the middle of the thermal bimetallic strip; two ends of the thermal bimetallic strip are turned over upwards to deform after the thermal bimetallic strip is heated, and a movable contact is separated from a fixed contact; and meanwhile, the pressing sheet moves downwards and is propped against the PTC ceramic heating block. The PTC ceramic heating block arranged in the shell is matched with the pressing sheet in the middle of the thermal bimetallic strip, so that the reliability of the power-off time delay protector when working is improved and the power-off time delay protector can be applied to motors and electric appliances.

Description

technical field [0001] The invention relates to an overheat protector, in particular to a bimetal overheat protector. Background technique [0002] In the prior art, the overheating protector adopts a bimetal overcurrent design. When the temperature of the thermal bimetal exceeds the trigger temperature, the thermal bimetal will be deformed, thereby disconnecting the circuit and completing the protection. The disadvantage is that due to Power failure will cause the ambient temperature of the thermal bimetal to drop, so that when the temperature drops to the reset temperature, the thermal bimetal will continue to connect the circuit, which will cause a certain safety hazard in the circuit and cause a waste of electric energy. Contents of the invention [0003] The purpose of the present invention is to provide a self-locking power-off delay protector, which ensures its power-off protection effect and improves its safety in use. [0004] The object of the present invention ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the overheating protector adopts a bimetal overcurrent design. When the temperature of the thermal bimetal exceeds the trigger temperature, the thermal bimetal will be deformed, thereby disconnecting the circuit and completing the protection. The disadvantage is that due to Power failure will cause the ambient temperature of the thermal bimetal to drop, so that when the temperature drops to the reset temperature, the thermal bimetal will continue to connect the circuit, which will cause a certain safety hazard in the circuit and cause a waste of electric energy

Images