JPH0181844U

JPH0181844U -

Info

Publication number: JPH0181844U
Application number: JP1987177950U
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: JPH0728671Y2

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、１６は第２のピ
ン、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 one 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, 16 is a second pin, 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 holding the movable element is divided into a first contact arm and a second contact arm that are mutually rotatably supported, and an opening/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, wherein at least the pin sliding surface of the guide hole of the first contact arm and the first A circuit breaker characterized in that at least a pin sliding surface of the elongated hole of the second contact arm is subjected to surface hardening treatment so that the hardness of both pin sliding surfaces is higher than the hardness of the second pin. (2) The circuit breaker according to claim 1, wherein the surface hardening treatment is soft nitriding treatment. (3) The circuit breaker according to claim 1, wherein the surface hardening treatment is a carburizing treatment.