Thermal overload relay with current transformers

Abstract

Thermal overload relay with current transformer, its overall double-layer shell is composed of horizontally stretched partition seat and longitudinally stretched barrel-shaped upper and lower shell walls, the thermal release is installed in the upper cavity, and the three current transformers are installed in the In the lower cavity, the two secondary lead wires of each current transformer enter the upper cavity from the lower cavity through the through hole provided at the joint intersection of the partition seat and the upper and lower cavity. The relay also includes L and T-side wiring devices arranged in the upper cavity, the L-side lead wire of each electric heating device is connected to the first lead wire of the corresponding current transformer through the L-side wiring assembly, and the T-side lead wire is connected to the corresponding current transformer through the T-side wiring assembly. The other lead of the current transformer is connected. The relay panel is fixedly connected to the barrel-shaped upper shell wall, and all devices and their leads are enclosed in the upper cavity, only the terminals protrude out of the upper cavity through the window on the panel, and the bottom plate is used to seal all the current transformer components in the double In the lower cavity of the layer shell.

Description

technical field [0001] The invention relates to a thermal overload relay, in particular to a thermal double gold overload relay with a current transformer. Background technique [0002] Thermal overload relay, referred to as thermal relay or thermal tripper, is a low-voltage electrical appliance widely used in overload protection of electric loads or AC motors, and can also be combined with a contactor to form an electromagnetic starter. Thermal bimetallic overload relay is the most commonly used thermal relay. It uses a bimetal sheet with delay characteristics as a thermal element. It not only has the function of overload protection, but also has the function of phase failure protection. The gold piece is connected in series to the line on the input side of the load such as the motor. When the motor is overloaded or a phase failure occurs in the three-phase line, the current of at least one phase line will increase, so that the double gold piece connected to the phase line ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a thermal overload relay with a current transformer that overcomes the above defects. By integrating the thermal release and the current transformer into a thermal overload relay with a current transformer, it not only solves the above three problems. There are many hidden dangers, and it has the comprehensive advantages of more compact and reasonable structure, easy installation and debugging, easy operation and use, and reduced product volume.

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