Electric connection mechanism used for plug-in circuit breaker

Abstract

The invention relates to an electric connection mechanism which comprises at least one fixed terminal, at least two contact pieces and at least one slotting tool, wherein the fixed terminal is provided with a platy raised part extending forwards, the upper surface and lower surface of the free end of the fixed terminal are contact surfaces, and the free end thereof is provided with a hole or a groove at the left side and the right side respectively; a first contact surface is arranged at the rear end of each contact piece and provided with a hole or a groove, the shape of the first contact surface of each contact piece is matched with that of the contact surface of the fixed terminal, the other end of each contact piece is provided with a second contact surface vertical to the first contact surface, the first contact surfaces of the two contact pieces are pressed on the contact surface of the raised part respectively through elastic components, and the second contact surfaces of the two contact pieces are opposite to each other so as to form a plug-in clamping head; and the slotting tool is plugged in the plug-in clamping head, and the free end of the slotting tool is provided with a contact surface matched with the second contact surfaces of the contact pieces in shape. As for the electric connection mechanism, the contact pieces and the fixed terminal are well contacted all the time, the contact pieces and the slotting tool are maintained to be well contacted, and the error correction capacity is extremely good.

Description

technical field [0001] The invention relates to an electrical connection mechanism for a plug-in circuit breaker, which belongs to the field of electrical switches. Background technique [0002] The electrical connection between the main body and the drawer of the drawer type frame circuit breaker is realized by drawing and inserting the conductive structure. This conductive structure usually includes a fixed terminal, a blade, and a plug-in collet for connecting the fixed terminal and the blade. Among them, the inserting knife is installed on the body of the drawer circuit breaker, and is respectively connected with the dynamic and static contacts of the circuit breaker; the fixed terminal is installed in the drawer seat, and one end thereof is connected with the bus bar outside the circuit breaker; the plug-in clamp The head is used to form an electrical connection between the blade and the fixed terminal. [0003] As mentioned above, the inserting knife is used to conne...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is: the cylindrical contact arc surface of the fixed terminal is matched with the rear end of the plug-in clamp, and the plug-in clamp cannot be adjusted in an appropriate amount in the front and rear directions. Due to the existence of manufacturing or installation errors, the plug-in clamp There can be no surface contact fit between the collet and the inserting knife, only a very weak line fit, resulting in a weak link in the conduction between the plug-in collet and the inserting knife

According to this technical invention, if the dimensions of the inserting knife, the inserting chuck, and the mounting seat are sufficiently accurate, and the inserting knife enters the inserting chuck precisely according to the designed position and direction, then the distance between the inserting knife and the inserting chuck The space between the plug-in chuck and the mounting seat can maintain a good surface connection contact, but if there is even a slight offset or an error in the machining accuracy of the three, the inserting knife will "pry up" the contact piece, making it The contact piece and the blade, the contact piece and the fixed terminal are all in line contact, which makes the conductivity drop sharply

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