Contact system capable of automatically change-over switching electric appliance

Abstract

The utility model relates to a contact system of an electrical appliance with an automatic shift switch, which consists of a shell, a moving contact component, a static contact component and an interrupter. A side of the shell is sunken and forms a setting hole with a moving contact component and a component setting hole with a static contact; the two ends of the moving contact component form the moving contact with a finger-shaped assembling type and the static contact with a knife-shaped plug-type; the static contact component consists of two finger-shaped assembling type static contacts and two static contacts with knife-shaped plug-type; the interrupter is arranged between two static contacts with finger-shaped assembling type and the moving contact with finger-shaped assembling type. The invention provides the contact system of automatic switch electrical appliance which integrates the traditional finger-shaped assembling type contact with knife-shaped plug-type contact together. The invention uses the integration of the finger-shaped assembling type contact and the interrupter to reach a higher requirement of connecting capacity and breaking capacity. Besides, the invention can use a mutual compensation of the repulsion force of the crunode of the finger-shaped assembling type contact and the electrical suction of the crunode of the knife-shaped plug-type contact, so as to improve the short circuit resistance capacity of the switch electrical appliance.

Description

technical field [0001] The invention relates to an automatic transfer switch electric appliance, in particular to a contact system of the automatic transfer switch electric appliance. Background technique [0002] The function of the automatic transfer switch is to monitor the power supply circuit, and can automatically switch one or several load circuits from one power supply to another power supply. It is usually equipped with a motor or electromagnet and a contact system as a power source. And the product standard requires that the switching electrical products should have high making and breaking capacity and short-term withstand capacity. At present, the commonly used contacts on automatic transfer switch appliances are mainly divided into finger-type clap-type contacts that are mostly used in low-voltage circuit breakers and knife-type plug-in contacts that are mostly used in low-voltage isolating switches. Among them, the contacts welded on the finger-type snap-fit ​...

AI Technical Summary

Problems solved by technology

Among them, the contacts welded on the finger-type snap-fit ​​contacts are made of silver-based alloy materials, so they can resist burning under the arc action when closing or breaking the circuit, so they have high connection and breaking capabilities. However, due to the repulsive force of the contact's node electromotive force, limited by this factor, the dynamic and thermal stability of the contact is poor, so the contact will repel under the action of a relatively high short-term withstand current, so it is difficult Reach the requirements of the short-term tolerance specified in the standard

Because the electric power of the knife-type plug-in contact is suction type, its dynamic and thermal stability is high, so it can achieve a high short-term tolerance index, but because the contact adopts a non-contact design, it is closed or When the circuit is disconnected, the contact cannot resist arc burning, so it is difficult to meet the requirements of high making and breaking capacity

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