Electric conduction system of switch device, low-voltage plastic-shell circuit breaker and thermal overload relay

Abstract

The invention discloses an electric conduction system of a switch device, a low-voltage plastic-shell circuit breaker and a thermal overload relay. The electric conduction system of the switch device comprises a shell, at least one fixed contact, a moving contact and an arc extinguishing system wherein the fixed contact, the moving contact and the arc extinguishing system are all arranged on the shell. The electric conduction system is characterized in that the fixed contact comprises a rotatable contact support which is arranged on the shell in a pivoting manner, and the contact support is provided with a guide slot for accommodating electric arc ions on the surface rotating around a rotation shaft of the contact support. By means of arranging the guide slot on the surface of the contact support to accommodate the diffusing electric arc ions, the problem that sold metal formed after the electric arc ions are coagulated blocks the rotation of the contact support is avoided, the influence of the electric arc ions to the disjunction of the contacts is eliminated, the reliability, disjunction number of times and service life of a product are increased.

Description

technical field [0001] The invention relates to the technical field of low-voltage switches, and more specifically, relates to a conductive system of low-voltage switch devices, a low-voltage molded case circuit breaker and a thermal overload relay. Background technique [0002] Arcing is a physical phenomenon often encountered in the operation of switching appliances. When the voltage between the contacts reaches the arcing voltage, the current also reaches the arcing current, and the gap between the contacts will generate an arc. Low-voltage switching devices such as circuit breakers and relays, when the contacts are separated under the condition of short-circuit current, the current is densely concentrated in the corresponding gradually smaller contact area, so that the temperature of the contact point and surface rises rapidly, and a melting bridge appears at the moment of separation. When flowing in the form of a conductive plasma column, under the action of electromoti...

AI Technical Summary

Problems solved by technology

If this part of the solid metal is not handled in time, the friction between the contact support and the housing will increase during the subsequent rotation of the shaft, causing the shaft to become stuck, thereby increasing the time for the mechanism to operate and increasing the contact force. The loss and burning of the arc extinguishing chamber will have a serious impact on the next contact breaking, and eventually lead to breaking failure

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