Contact mechanism and switching device

Abstract

The invention relates to a contact mechanism and a switching device. The contact mechanism comprises a Y-shaped moving contact and a static contact composed of a first static contact and a second static contact. The moving contact comprises two moving contact contact arms and a moving contact connecting arm, and the first static contact is of a U-shaped structure capable of reversing current and comprises a first static contact plate used for being matched with the moving contact and a first static connecting plate connected with the first static contact plate; the two moving contact contact arms are respectively matched with the first static contact plate of the first static contact and the second static contact, so that the direction of the current flowing through the first static contact plate is opposite to the direction of the current flowing through one moving contact contact arm matched with the first static contact plate when the moving contact is closed; and the direction of the current flowing through the second static contact is opposite to the direction of the current flowing through the contact arm of the other moving contact matched with the second static contact, the double-breakpoint structure improves the breaking capacity, the breaking speed is increased by means of the mutual exclusion force between the moving contact and the static contact, and the switching device comprises the contact mechanism.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a switch electrical appliance. Background technique [0002] A DC circuit breaker is a switching device that can carry and break current under normal circuit conditions, and can also carry and break current under abnormal circuit conditions within a specified time. The function of breaking the overload or short-circuit current of the circuit breaker is mainly realized in the arc extinguishing chamber of the circuit breaker. When a fault current occurs in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism operates to quickly disconnect the moving and static contacts of the circuit breaker. At this time, the voltage formed between the moving and static contacts will cause the air medium to discharge, thereby generating a high-temperature arc. During the burning process of the arc, the temperature of th...

AI Technical Summary

Problems solved by technology

[0003] However, these current arc extinguishing methods can only solve the arc generated by low voltage. For the arc generated by high voltage, the arc extinguishing ability of single pole and single chamber is slightly insufficient.

[0004] In addition, the traditional unipolar single-break contact mechanism can only meet the breaking requirements under a certain working voltage. When the working voltage is high, the traditional unipolar single-break contact mechanism cannot meet the breaking requirements.

Images