KR20080029905A - Circuit breaker - Google Patents

Abstract

A circuit breaker is provided to reduce a size of a switching mechanism unit by integrally moving a latch mechanism of the switching mechanism unit and a contact operation member to reduce an installation space of the latch mechanism. A circuit breaker includes a switching contact unit(10), a contact operation member(21), an abnormality detection unit(41), and a switching mechanism unit(31). The switching contact unit switches an electric line between a power side terminal(2) and a load side terminal(3). The contact operation member moves between a closing position to close the switching contact unit and an opening position to open the switching contact unit. The abnormality detection unit detects abnormality of the electric line. The switching mechanism unit moves the contact operation member from the closing position to the opening position by separating a latch mechanism(32) when the abnormality detection unit is operated. The latch mechanism and the contact operation member are moved as one body.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to circuit breakers provided on the inside of distribution boards and the like, and more particularly, to circuit breakers in which the whole is made thin and compact.

Background Art Conventionally, circuit breakers are known in which a load side terminal is provided on the front side of a breaker case, and a power supply side terminal is provided on the back side of the breaker case, and the thickness of the breaker case is reduced in thickness. For example, Patent Document 1 describes a circuit breaker in which a plurality of power supply side terminals are arranged in an up and down direction of a breaker case using a plug-in terminal that connects a conductive bar to a power supply side terminal. Patent Literature 2 describes a circuit breaker in which both the power supply side terminal and the load side terminal are arranged in the vertical direction of the breaker case.

Further, conventionally, an opening / closing contact portion for opening and closing an electric line, a contact manipulation member for opening and closing an open / close contact portion, and an opening / closing mechanism portion for forcibly opening and operating a contact manipulation member when an abnormality occurs in an electric line. Installed circuit breakers are known. For example, Patent Literature 3 axially supports an 'T' shaped outer member on an 'L' shaped frame fixed inside the breaker case, and holds the outer member. The opening and closing mechanism connected to the operation handle is described.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-35341

Patent Document 2: Japanese Patent Application Laid-Open No. 2002-216610

Patent Document 3: Japanese Patent Application Laid-Open No. 2000-323005

In the conventional circuit breaker, the circuit breaker case can be made thin by arranging the power supply side terminal and the load side terminal in the vertical direction. However, since the opening / closing mechanism part occupies a large space inside the breaker case, there is a problem that the effect of miniaturization is limited.

An object of the present invention is to provide a circuit breaker capable of miniaturizing the opening and closing mechanism, and to configure the circuit breaker case thinner.

In order to solve the above object, the present invention provides a circuit breaker as follows.

(1) Detecting abnormality of the electric line and the contact control member movable between the opening and closing contact portion for opening and closing the electrical line between the power supply terminal and the load side terminal, the closed position for closing the open and close contact portion, and the open position for opening and closing the contact point. And an opening / closing mechanism for removing the latch mechanism and moving the contact manipulation member from the closed position to the open position when the abnormality detecting means is operated, wherein the latch mechanism is installed to be movable with the contact manipulation member. Circuit breaker.

(2) A plurality of power supply terminals are arranged on the back of the breaker case, and a plurality of load side terminals are arranged on the front of the breaker case in the up and down direction, and a contact operating member is installed in the breaker case so as to be movable in the up and down direction. The circuit breaker according to the above (1), wherein the circuit breaker is provided on the upper portion of the operation member so as to be movable.

(3) Arrange the operation handle on the upper surface of the breaker case, interpose the connection member between the operation handle and the contact operation member, axially support one end of the connection member to the operation handle, and connect the other end of the connection member to the contact operation member. In between the upper part and the latch mechanism, the operation handle moves the contact manipulation member from the open position to the closed position with the connecting member interposed therebetween, so that the latch mechanism cooperates with the connecting member to hold the contact manipulation member in the closed position. The circuit breaker as described in said (2) characterized by the above-mentioned.

(4) The circuit breaker according to the above (3), wherein the operation handle has a restricting protrusion for restricting the movement of the connecting member in the open position of the contact operating member. More preferably, the circuit breaker characterized in that the regulating projection sandwiches the connecting member with the latch mechanism.

(5) The opening and closing mechanism includes an outer member for removing the latch mechanism in response to the operation of the abnormality detecting means, wherein the latch mechanism is engaged with the first cam member engaged with the outer member and the other end of the connecting member. The circuit breaker as described in said (3) or (4) characterized by including the 2nd cam member and the spring member which presses a 1st and 2nd cam member in the direction which meshes with each other.

(6) The circuit breaker according to the above (5), wherein the first and second cam members are rotatably supported around the axis line in the left and right directions on the upper portion of the contact manipulation member.

(7) A plurality of fixed contact points of which the opening and closing contact portions are fixed to the breaker case and a plurality of movable point points provided inside the contact operating member, and the movable contact and the fixed contact are connected to the contact operating member as the contact operating member moves. The circuit breaker as described in any one of said (1)-(6) which opens and closes inside.

(8) Switching contact points for arranging a plurality of power supply terminals on the back of the breaker case, a plurality of load side terminals on the front of the breaker case in the vertical direction, and opening and closing an electric line between the power supply terminal and the load side terminals inside the breaker case. The printed circuit board is provided with a contact manipulation member which is movable in the vertical direction between the closed position for closing the open / close contact portion and the open position for opening the open / close contact portion, an abnormality detection circuit for detecting an abnormality in the electric line, and an abnormality detection circuit. At this time, the latch mechanism is detached to move the contact manipulation member from the closed position to the open position. The latch mechanism is provided to be integrally movable on the upper portion of the contact manipulation member so that the printed circuit board is located behind the latch mechanism. Circuit breaker, characterized in that installed in parallel with the side of the.

(9) The circuit according to the above (8), wherein the front face of the breaker case is formed in an inclined shape in which the upper side retreats, and the contact manipulation member is movable so as to be movable in the vertical direction inclined in parallel with the front face of the breaker case. breaker.

(10) When the contact manipulation member is raised to the open position, the contact manipulation member and the printed circuit board are disposed close to each other so that at least a part of the latch mechanism overlaps with the print substrate when viewed from the side. Circuit breaker.

(11) The opening and closing mechanism includes an outer member for removing the latch mechanism in response to the operation of the abnormality detection circuit, and the outer member is installed to be movable in the vertical direction between the contact manipulation member and the printed board, and the latch is provided. The mechanism is provided so that the cam member engaged with the outer member is projected on the rear side of the contact manipulation member, and when the contact manipulation member is raised to the open position, the protrusion of the cam member overlaps with the printed board when viewed from the side. The circuit breaker as described in said (9) or (10) characterized by the above-mentioned.

According to the circuit breaker of the present invention, since the latch mechanism of the opening and closing mechanism moves integrally with the contact operating member, the effect of reducing the installation space for the latch mechanism, making the opening and closing mechanism smaller, and making the circuit breaker case thinner. have. In addition, by providing the latch mechanism on the upper portion of the contact manipulation member, there is an effect that it is possible to operate the contact manipulation member and the operation handle in a simple and compact configuration.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment which actualized the circuit breaker of this invention is described based on drawing. 1 shows an appearance of a circuit breaker, and FIG. 2 shows a front surface of the circuit breaker. 3 and 4 show the circuit breaker internal mechanism when the electric line is closed, and Figs. 5 and 6 show the circuit breaker internal mechanism when the electric line is opened. 7 shows a combined structure of the opening and closing contact portion and the separator. In addition, in the following description, the front surface of a circuit breaker is made into the left side of FIG. 1, the back surface of a circuit breaker is made into the right side of FIG. 1, and the upper surface of a circuit breaker is made into the upper side of FIG.

The circuit breaker 1 of this embodiment is used for a single phase three-wire electric line. The circuit breaker case 4 is formed by pairing the left and right pairs of case members made of synthetic resin to form a thin box shape having a width of, for example, about 10 mm (see FIGS. 1 and 2). The back side of the breaker case 4 is provided with the power supply side terminal 2, and the load side terminal 3 is provided in the front of the breaker case 4. As shown in FIG. Inside the breaker case 4 (see FIG. 3), the closing position for closing the opening and closing contact portion 10 and the opening and closing contact portion 10 for opening and closing the electric line between the power supply side terminal 2 and the load side terminal 3 and A printed circuit board equipped with a separator (contact operation member) 21 that is movable between the open position of the contact portion 10 and an earth leakage detection circuit or a test circuit for detecting an abnormality in an electric line (an abnormality detection circuit). 20, a zero phase current transformer (abnormal detecting means) 41 for detecting a short circuit, and an opening / closing mechanism 31 for moving the separator 21 from a closed position to an open position when a short circuit occurs. It is.

The power supply side terminal 2 is provided with three terminals P1, P2, and P3 on the rear of the circuit breaker case 4 in a vertical line (refer to FIG. 1). The upper terminal P1 is used as the neutral terminal, and the central terminal P2 and the lower terminal P3 are used as the voltage terminal. Each terminal P1-P3 is equipped with the horizontal U-shaped terminal electrode 13 (refer FIG. 3), and the terminal electrode 13 is easy only by inserting the conductor bar (not shown) wired in the distribution board. A plug-in terminal that can be connected easily is used. Near the terminals P1 to P3, the trip coil 8 which cuts off when a short circuit occurs, the plurality of bimetal pieces 42 which cut off when an overcurrent occurs, and the plurality of movable electromagnetic pieces cut off when a short circuit current occurs. ) Is installed.

The front of the circuit breaker case 4 is formed in an inclined shape in which the upper side retreats, and three terminals L1, L2 and L3, which are the load side terminals 3, are installed side by side in a line up and down, and each terminal L1. Load wiring (not shown) is inserted into and connected to L2 and L3. The terminals L1 to L3 are installed at substantially the same height as the terminals P1 to P3 of the power supply side terminal 2, the center terminal L2 is used as the neutral pole terminal, and the upper terminal L1 and the lower terminal L3. Is used as the voltage terminal. In the illustrated example, the terminal hole 12 of the unused terminal L2 is closed by a slide terminal cover 16 and closed.

Each terminal L1 to L3 includes a locking electrode 15 (see FIG. 3B) for fastening the wire portion of the load wiring, a holder 14 (see FIG. 3A) for holding the locking electrode 15, and a holder ( A fixed electrode 11 protruding from the 14 toward the separator 21 is provided, and a fixed contact 11a constituting the open / close contact portion 10 is fixedly coupled to the rear end of the fixed electrode 11. In addition, the terminals L1 to L3 are constituted by fast-connect terminals that can be connected only by inserting the load wiring into the terminal holes 12. When removing the load wiring, the locking electrode 15 is opened by the release lever 17 provided at the upper end of the breaker case 4.

On the upper surface of the breaker case 4, an operation handle 5 for moving the separator 21 from the open position to the closed position is rotatably provided in the front-rear direction. As shown in FIG. 5, FIG. 6, when the separator 21 raises to an open position and the electric line is cut off, the operation handle 5 stands up from the upper surface of the breaker case 4. As shown in FIG. As shown in FIG. 3, FIG. 4, when the separator 21 descend | falls and the electric line is energized, the operation handle 5 falls in parallel with the upper surface of the breaker case 4. As shown in FIG. On the upper part of the breaker case 4, a pair of left and right protection walls 7 which accommodate the fallen operation handle 5 are protruded (see Figs. 1 and 2).

The printed circuit board 20 is disposed in parallel with the side of the case at the upper inner side of the breaker case 4 at a position approaching the rear side of the separator 21. The protruding contact 19 is provided on the printed circuit board 20, and the free end 51a of the transverse U-shaped test switch 51 is arranged in contact with the upper side of the protruding contact 19. The base end of the test switch 51 and the protruding contact 19 are electrically connected to a test circuit on the printed board 20. Near the front side of the operation handle 5, a test button 6 for operating the test switch 51 ON / OFF is provided so as to be exposed to the upper surface of the breaker case 4.

Then, the test switch 51 is brought into contact with the protruding contact point 19 by the test button 6, a pseudo leakage current flows through the test circuit, and an operation test of the leakage detection circuit or the trip coil 8 is performed. have. On the right side of the upper end part of the separator 21, the protrusion 52 which engages from the lower part in the upper half part of the test switch 51 is provided. When the separator 21 ascends to the open position, the projection 52 forcibly removes the free end 51a from the projection-shaped contact point 19, and the operation of the test circuit is turned on in the disconnection state of the electric line. Prohibit.

Next, the structure of the separator 21 and the opening / closing mechanism part 31 is demonstrated. The separator 21 is formed in a tubular shape or a columnar shape by a synthetic resin material, and is installed to be movable in the vertical direction, inclined in parallel with the front surface of the breaker case 4 at the rear side of the load-side terminal 3. An insertion hole 22 having three upper and lower ends is formed on the front surface of the separator 21 (see FIG. 3A), and the fixing contact 11a on the fixed electrode 11 is inserted into the separator 21 through the insertion hole 22. It is inserted inward. The insertion hole 22 is opened to a predetermined length in the vertical direction so that the separator 21 can slide up and down in a state where the fixed electrode 11 is inserted.

On the rear surface of the separator 21, the upper and lower mounting holes 24 are formed to communicate with the insertion holes 22 (see Fig. 7), and the movable electrodes 23 are provided in the respective mounting holes 24. The movable electrode 23 is formed by bending a metal plate in a side L-shape, and the movable contact 23a of the open / close contact portion 10 is positioned above the fixed contact 11a at a horizontal portion inserted into the separator 21. It is fixedly coupled so as to face from. The vertical portion of the movable electrode 23 is wider than the mounting hole 24, and functions as a stopper for restricting the movement of the movable contact 23a in front. A pair of concave grooves 25 are formed on the inner wall surface of the separator 21 so as to face each other, and a convex portion 27 fitted to the concave groove 25 is formed in the horizontal portion of the movable electrode 23. .

An end portion (not shown) in which the convex portion 27 continues to be dropped is formed in the front-rear middle portion of the concave groove 25 so that the movable electrode 23 moves the separator 21 in a range corresponding to the height of the end portion. It is installed so that it can be raised and lowered. A press spring 28 (see FIGS. 4A and 6A) is interposed between the separator 21 and the movable electrode 23 so that the movable contact 23a is fixed by the negative contact force of the press spring 28. At the same time, the convex portion 27 is firmly hung on the end of the concave groove 25. A stone piece 30 is formed on the rear surface of the separator 21, and a blocking spring 26 for biasing the separator 21 upward between the stone piece 30 and the spring receiver 29 of the breaker case 4 is provided. Intervened. As the separator 21 moves, the movable contact 23a and the fixed contact 11a open and close inside the separator 21.

As shown in FIG. 4, FIG. 6, the opening-closing mechanism part 31 is comprised from the latch mechanism 32, the outer member 35, and the link member 37. As shown in FIG. The latch mechanism 32 is provided so that the latch mechanism 32 can be integrally moved inside the upper part of the separator 21. The outer member 35 is disposed so as to be movable in the vertical direction between the upper portion of the separator 21 and the printed circuit board 20. The link member 37 is interposed between the operation handle 5 and the upper part of the separator 21. When the abnormality occurs in the electric line, the opening and closing mechanism 31 detaches the link member 37 by removing the latch mechanism 32 with the outer member 35, and the separator 21. Is moved from the closed position to the open position.

The latch mechanism 32 is composed of a first cam member 33, a second cam member 34, and a torsion spring 36. The first cam member 33 includes a contact portion 33a, a locking portion 33b, a locking projection 33c, and a shaft portion 33d, and an axis line in the left and right directions on the upper portion of the separator 21 at the shaft portion 33d. It is supported rotatably around. The second cam member 34 includes a pressing portion 34a, a locking end portion 34b, a locking wall 34c, and a shaft portion 34d. The second cam member 34 has a left and right direction at the top of the separator 21 at the shaft portion 34d. It is rotatably supported around the axis. The torsion spring 36 is mounted on the shaft portion 34d of the second cam member 34, and the two cam members (1) are fixed to the locking wall (34c) and the other end is fixed to the locking projection (33c). 33,34) in the direction of engaging with each other.

The link member 37 is a connecting member for linking and operating the operation handle 5 and the separator 21, and is formed in a substantially C shape when viewed from the back side of the breaker case 4 (see FIG. 3B). The base end 37a of the link member 37 is axially supported by the operation handle 5, and the free end 37b of the link member 37 is connected to the upper stepped surface 38 of the separator 21. I'm in contact. Then, when the operation handle 5 is rotated from the standing position to the horizontal position, as shown in Fig. 4A, the operation handle 5 pushes the separator 21 down with the link member 37 interposed therebetween. The separator 21 descends from the open position to the closed position while countering the negative force of the interruption spring 26.

In the state where the separator 21 is lowered to the open position, as shown in Fig. 4B, the pressing portion 34a of the second cam member 34 is rearward of the free end 37b of the link member 37. Engaged with the link member 37 to restrict rotation of the link member 37, and the latch mechanism 32 cooperates with the link member 37 to hold the separator 21 in the open position. On the base of the operation handle 5, a regulating projection 39 (see Fig. 5B) that can be engaged with the link member 37 is formed, and the regulating projection when the separator 21 is raised to the open position. (39) sandwiches the link member 37 between the pressing section 34a (see FIG. 6B) to restrict the rotation of the link member 37 and to maintain the free end 37b above the separator 21. It is.

The contact portion 33a, which is a protruding portion of the first cam member 33, projects from the upper portion of the separator 21 toward the printed circuit board 20 so as to be engaged with the outer member 35 from above. (See FIG. 7). The outer member 35 instantly moves upward when the plunger 8a (see FIG. 4A) of the trip coil 8 performs a pulling operation, and the contact portion 33a. The first cam member 33 is rotated with the gap between them, and the catching portion 33b is removed from the catching end 34b against the biasing force of the torsion spring 36. Then, the second cam member 34 rotates with the force of the torsion spring 36 to separate the pressing section 34a from the free end 37b to free the link member 37.

As a result, the latch mechanism 32 is released, and the separator 21 is raised to the open position by the negative force of the interruption spring 26 to open the open / close contact portion 10. When the separator 21 rises to the open position, the contact portion 33a of the first cam member 33 is disposed at a position overlapping the printed board 20 when viewed from the side (see FIG. 6B). On the other hand, the bimetallic piece 42 and the movable electromagnetic piece 43 also operate like the trip coil 8, and drive the outer member 35 when detecting an abnormality in the electric line. It is comprised so that the latch mechanism 32 may be released.

Next, the operation of the circuit breaker 1 will be described. In the circuit breaker 1 of this embodiment, the circuit breaker case 4 is accommodated in the distribution panel, and the conductor bar is electrically connected to the movable contact 23a with the power supply side terminal electrode 13 and the internal wiring interposed therebetween, and the load wiring. The fixed electrode 11 is sandwiched between and electrically connected to the fixed contact 11a. When the electric line is in the energized state, as shown in FIG. 4, in the opening and closing mechanism part 31, the second cam member 34 of the latch mechanism 32 opens the free end 37b of the link member 37. The separator 21 is held in the lowered position against the negative force of the blocking spring 26 by pressing on the step surface 38 of the separator 21, and the movable contact 23a is in contact with the fixed contact 11a, whereby the electric wire The furnace remains energized.

When an abnormality such as a short circuit, overcurrent or short circuit occurs in the electric line, the trip coil 8, the bimetal piece 42 or the movable electromagnetic piece 43 pushes the outer member 35 up to The outer member 35 grasps the first cam member 33 from the second cam member 34, and the latch mechanism 32 frees the link member 37. Thereby, as shown in FIG. 6, the separator 21 raises by the negative force of the interruption spring 26, and removes the movable contact 23a from the fixed contact 11a, and interrupts an electric line. At the same time, the operation lever 5 stands up with the link member 37 interposed by the separator 21. When the separator 21 reaches the ascending position, the second cam member 34 is rotated in reverse by the separator 21, and the first cam member 33 is rotated by the secondary force of the torsion spring 36 to form the second cam member ( 34), the latch mechanism 32 keeps the electric line in the blocked state.

According to the circuit breaker 1 of this embodiment, since the separator 21 is provided to be movable in the up-down direction like the arrangement direction of the power supply side terminal 2 and the load side terminal 3, the breaker case 4 is made into a thin box. It can be formed into a mold. Since the movable contact 23a and the fixed contact 11a are accommodated inside the separator 21, the open / close contact portion 10 can be opened and closed using the space in the breaker case 4 efficiently. Since the movable contact 23a is provided in the separator 21, even when contact welding occurs, both the contacts 11a and 23a can be forcibly removed by the movement of the separator 21. As shown in FIG. In addition, the press spring 28 stabilizes the contact state between the contacts within the separator 21 and prevents contact failure.

In the opening / closing mechanism part 31, since the latch mechanism 32 moves integrally with the separator 21, the space for exclusive use of the latch mechanism 32 can be omitted, and the opening / closing mechanism part 31 can be miniaturized. Therefore, the width | variety of the circuit breaker case 4 can be reduced to about 10 mm, and the circuit breaker 1 can be comprised thinner than before. In addition, by easily configuring the latch mechanism 32 with a small number of small parts 33, 34, 36, the opening / closing mechanism 31 can be downsized as compared with the conventional employing the T-shaped holding member. Since the cam members 33 and 34 are rotatably supported around the axis in the left and right directions, the thickness of the separator 21 can be reduced and the thickness of the breaker case 4 can be promoted. In addition, the latch mechanism 32 is provided above the separator 21, so that the front-rear length of the breaker case 4 can also be shortened. Since the contact portion 33a of the first cam member 33 overlaps the printed circuit board 20 at the elevated position of the separator 21, the separator 21 can be tilted up and down in a limited internal space of the breaker case 4. In addition, the printed circuit board 20 can be compactly installed behind the separator 21. The outer member 35 can be operated using a gap between the printed circuit board 20 and the separator 21.

The circuit breaker of this invention is not limited to the said embodiment, As shown below, it is also possible to change the structure and shape of each part suitably, and to implement in the range which does not deviate from the meaning of invention.

(1) The present invention is applied to a circuit breaker for use in single-phase two-wire or three-phase electric lines.

(2) The separator 21 is installed in the circuit breaker case 4 so as to be movable in the vertical direction, with the front face of the circuit breaker case 4 as a vertical plane parallel to the rear surface.

(3) A structure in which the movable contact 23a is separated from the fixed contact 11a by the lowering of the separator 21.

(4) Either one or both of the bimetal piece 42 for overcurrent interruption and the movable electromagnetic piece 43 for short circuit interruption are abbreviate | omitted and implemented.

(5) The movable electrode 23 is provided to be movable with respect to the separator 21 as an installation component separate from the separator 21.

(6) The latch mechanism 32 of the opening / closing mechanism part 31 protrudes behind the separator 21 so as to overlap with the printed circuit board 20.

1 is an external perspective view of a circuit breaker showing an embodiment of the present invention.

2 is a front view of a circuit breaker.

3 is a perspective view showing a circuit breaker internal mechanism when the electric line is closed.

4 is a side view showing the internal circuit breaker of the circuit breaker when the electric line is closed.

5 is a perspective view showing the internal circuit of the circuit breaker when the electric line is opened.

Fig. 6 is a side view showing the circuit breaker internal mechanism when the electric line is opened.

7 is a perspective view of the separator.

<Description of the symbols for the main parts of the drawings>

1: circuit breaker 2: power supply terminal

3: load side terminal 4: breaker case

5: operation handle 10: opening and closing contact

11a: fixed contact 20: printed circuit board

21: separator 23a: movable contact

31: opening and closing mechanism 32: latch mechanism

33: first cam member 34: second cam member

35: outer member 36: torsion spring

37: link member 39: regulation protrusion

41: current transformer 42: bimetal edition

43: Movable Electronics

Claims (11)

An abnormality detection for detecting an abnormality in the electrical line between the power contact terminal and the load side terminal, the opening and closing contact portion for opening and closing the electrical line, the closing position for closing the opening and closing contact portion, and the open position for opening and closing the contact portion, and the abnormality detection for detecting an abnormality in the electrical line. Means, and an opening and closing mechanism for removing the latch mechanism and moving the contact manipulation member from the closed position to the open position when the abnormality detecting means is operated, wherein the latch mechanism is movably installed integrally with the contact manipulation member. Circuit breaker. The circuit according to claim 1, wherein a plurality of load side terminals are arranged in a vertical direction on the rear surface of the breaker case and the front side of the breaker case, and a contact manipulation member is disposed in the breaker case so as to be movable in the vertical direction. And the latch mechanism is integrally movable on the upper portion of the contact manipulation member. The method of claim 2, wherein the operation handle is disposed on the upper surface of the breaker case, the connection member is interposed between the operation handle and the contact operation member, and one end of the connection member is axially supported by the operation handle, and the other end of the connection member Is engaged between the upper portion of the contact manipulation member and the latch mechanism, and the operation handle moves the contact manipulation member from the open position to the closed position with the connection member interposed, so that the latch mechanism cooperates with the connecting member to close the contact manipulation member. Circuit breaker, characterized in that it is held in position. 4. The circuit breaker according to claim 3, wherein the operation handle has a restricting protrusion for restricting movement of the connecting member in the open position of the contact operating member. 5. The method of claim 3 or 4, wherein the opening and closing mechanism includes an outer member for removing the latch mechanism in response to the operation of the abnormality detecting means, the latch mechanism comprising: a first cam member engaged with the outer member; And a second cam member engaged with the other end of the connecting member, and a spring member for biasing the first and second cam members in a direction to engage with each other. 6. The circuit breaker according to claim 5, wherein the first and second cam members are rotatably supported around the axis in the left and right directions on the upper portion of the contact manipulation member. The contact opening member according to any one of claims 1 to 6, wherein the opening and closing contact portion includes a plurality of fixed contacts fixed to the breaker case, and a plurality of movable point points provided inside the contact manipulation member. The circuit breaker characterized in that the movable contact and the fixed contact is opened and closed on the inside of the contact operating member in accordance with the movement. Switching contact points for arranging a plurality of power supply terminals on the back of the circuit breaker case, a plurality of load side terminals on the front of the circuit breaker case in the vertical direction, and opening and closing an electric line between the power supply terminal and the load side terminals inside the circuit breaker case. A latching mechanism when the abnormality detection circuit is operated, a printed circuit board having a contact operation member movable up and down between the closing position of the part and the opening position of the opening / closing contact portion, an abnormality detection circuit for detecting an abnormality in the electric line, and an abnormality detection circuit. And an opening and closing mechanism for moving the contact manipulation member from the closed position to the open position. The latch mechanism is integrally movable on the upper portion of the contact manipulation member, and the printed circuit board is located behind the latch mechanism. Circuit breaker, characterized in that installed in parallel with the side of the. The circuit breaker according to claim 8, wherein the front face of the breaker case is formed in an inclined shape with the upper side retracted, and the contact manipulation member is movably installed in a vertical direction inclined parallel to the front face of the breaker case. 10. The circuit breaker according to claim 9, wherein when the contact manipulation member is raised to an open position, the contact manipulation member and the printed circuit board are disposed close to each other so that at least a part of the latch mechanism overlaps with the print substrate when viewed from the side. . 11. The method of claim 9 or 10, wherein the opening and closing mechanism is provided with an outer member for removing the latch mechanism in response to the operation of the abnormality detection circuit, the outer member is in the vertical direction between the contact operation member and the printed board. The cam member is provided so as to be movable so as to protrude from the rear side of the contact manipulation member, and the latch mechanism is engaged with the outer member at an upper side. Circuit breaker, characterized in that overlap with the printed circuit board.

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