JPH0181843U

JPH0181843U -

Info

Publication number: JPH0181843U
Application number: JP1987177949U
Authority: JP
Priority date: 1987-11-20
Filing date: 1987-11-20
Publication date: 1989-05-31
Anticipated expiration: 2002-11-20
Also published as: JP2545876Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す部分縦断拡
大図、第２図は従来のものを示す縦断側面図、第
３図はオン状態を示す第２図の要部拡大図、第４
図はオフ状態を示す第３図と同じ図、第５図はト
リツプ状態を示す第３図と同じ図、第６図は反発
状態を示す第３図と同じ図、第７図は第６図の部
分縦断拡大図である。図において、４は自動引きはずし装置、７は可
動子、１０はコンタクトアーム、１０Ａは第１の
コンタクトアーム、１０Ｂは第２のコンタクトア
ーム、１１は第１のピン、１２は支軸、１４はガ
イド孔、１４ａは端部、１４ｃはピン摺動面、１
５は長孔、１５ａはピン摺動面、１６Ａは第２の
ピン、１６ａは当接面、１７はばねである。なお
、各図中同一符号は同一または相当部分を示す。 Fig. 1 is a partially enlarged vertical sectional view showing an embodiment of this invention, Fig. 2 is a vertical sectional side view showing a conventional one, Fig. 3 is an enlarged view of the main part of Fig. 2 showing the on state, and Fig. 4
The figures are the same as Figure 3 showing the OFF state, Figure 5 is the same as Figure 3 showing the trip state, Figure 6 is the same as Figure 3 showing the repulsion state, and Figure 7 is the same as Figure 6. It is a partial vertical enlarged view of . In the figure, 4 is an automatic tripping device, 7 is a mover, 10 is a contact arm, 10A is a first contact arm, 10B is a second contact arm, 11 is a first pin, 12 is a support shaft, and 14 is a Guide hole, 14a is the end, 14c is the pin sliding surface, 1
5 is a long hole, 15a is a pin sliding surface, 16A is a second pin, 16a is a contact surface, and 17 is a spring. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Scope of Claim for Utility Model Registration] (1) A circuit breaker that performs current limiting by separating the mover by electromagnetic repulsion due to the application of a large current, regardless of the interrupting operation by an automatic tripping device. , the contact arm that holds the movable element is divided into a first contact arm and a second contact arm that are mutually rotatably supported, and an opening and closing mechanism is provided on the first contact arm that is linked. a guide hole extending in the opening/closing direction; a long hole provided in the second contact arm in which the mover is supported by the first pin and extending in a direction intersecting the guide hole; the long hole and the guide hole. In the circuit breaker, the circuit breaker has a second pin that straddles and engages the second pin, and a spring that biases the second pin, the first contact arm having at least the pin sliding surface of the guide hole and the first contact arm. forming a surface that prevents arc melt from adhering to at least the pin sliding surface of the elongated hole of the second contact arm and a contact surface that abuts at least both of the pin sliding surfaces of the second pin; A circuit breaker characterized in that surface treatment is performed to prevent deterioration of slippage of the sliding surfaces of both pins and the abutment surface. (2) The circuit breaker according to claim 1, wherein the surface treatment is metal plating with a melting point higher than that of copper. (3) The circuit breaker according to claim 1, wherein the surface treatment is nitriding treatment.