KR20090035902A - Circuit breaker - Google Patents

Abstract

A circuit breaker is provided to improve functionality of a load side terminal by arranging a terminal inlet of a load side terminal, a window for confirming a contact, and an insertion groove for checking measurement on a front of a breaker case into top and bottom. An control lever(3) is installed on a top surface of a breaker case(2) of a thin box type, and opens/closes an electric circuit. Three load side terminals(4) and three power side terminals(5) are arranged on a front and a rear of the breaker case. A terminal inlet(7) is installed on a front of the breaker case, and connects a wire(9) to an electrode of the load side terminal. The electrode is installed in an inner side of the terminal inlet. A wire of a load wiring is inserted in the terminal inlet, and connected to a grip part of the electrode. A confirming window(11) for confirming a connection state of the wire is formed on a top side of the terminal inlet. An insertion groove(12) is installed in a bottom side of the terminal inlet, and connects a measurement terminal of a meter to the electrode.

Description

Circuit Breaker

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker having a thin thickness for distribution boards and the like, and more particularly, to a configuration around a load side terminal.

Background Art Conventionally, circuit breakers have been proposed in which the width of the breaker case is made thin so as to be compactly installed in the distribution panel. For example, Patent Document 1 provides an operation lever for opening and closing an electric circuit on an upper surface of a breaker case, and a single-phase three-wire electric circuit in which a plurality of load side terminals and a power supply terminal are arranged in the vertical direction on the front and rear surfaces of the breaker case, respectively. A circuit breaker for the invention is described.

Moreover, the circuit breaker which employ | adopted the fast terminal which is easy to connect an electric wire to the load side terminal is also known conventionally. In Patent Document 2, in the vicinity of the terminal inlet of the load-side terminal, the display member long and vertically supported in the circuit breaker case can be rotated back and forth, and the rotational position of the display member determines whether or not the wire is correctly connected to the fast-terminal electrode. The technique to display is described.

Patent Document 3 describes a technique for conducting a conduction test or an insulation resistance measurement test by installing a fitting groove and a cover in a direction perpendicular to the terminal inlet at a terminal cover covering a load side terminal, and inserting a measuring terminal of the instrument into the fitting groove. Is disclosed. Patent document 4 describes a technique for switching the voltage flowing in the electric circuit on the load-side terminal side through a switch mechanism inside the case as a sliding knob provided on the side of the breaker case.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2007-12594

[Patent Document 2] Japanese Patent Laid-Open No. 2005-353380

[Patent Document 3] Japanese Patent Application Laid-Open No. 7-50127

[Patent Document 4] Japanese Patent Application Laid-Open No. 2004-87240

However, the circuit breaker of Patent Literature 2 displays the connection state of the wire to the fast-terminal electrode of the load-side terminal with a long vertical display member. Therefore, when a plurality of load-side terminals are arranged in the vertical direction of the breaker case, interference between the display members is prevented. In order to avoid the need for installing the display member side by side in the breaker case side by side has a problem that the breaker case is thick.

The circuit breaker of Patent Document 3 has a problem in that it is difficult to open or close a door or insert a measurement terminal when a circuit breaker is installed side by side in the distribution panel in a direction perpendicular to the terminal inlet. The circuit breaker of Patent Document 4 has a problem in that the thickness of the case becomes thicker because the switch mechanism for voltage switching is provided inside the breaker case.

An object of the present invention is to provide a circuit breaker that can increase the functionality of the load side terminal without thickening the breaker case.

The present invention for achieving the above object is a circuit breaker provided with an operation lever for opening and closing the electrical circuit on the upper surface of the circuit breaker case, a plurality of load-side terminals and power supply terminals arranged in the vertical direction on the front and back of the circuit breaker case, respectively It is characterized by employ | adopting the following structures.

(1) A terminal inlet for connecting the electric wire to the fastening terminal electrode of the load side terminal is provided on the front of the circuit breaker case, and a confirmation window for checking the connection status of the electric wire is formed on the upper side of the terminal inlet. A circuit breaker comprising a fitting groove for electrically connecting the measuring terminal of the instrument to the fast terminal electrode.

(2) On the front of the breaker case, a terminal inlet for connecting the wire to the fast terminal electrode of the load-side terminal and a confirmation window for checking the connection status of the wire are formed, and the inside of the breaker case is slid by the end of the wire. A member, an elastic member for returning the sliding member, and a display member that pivots in conjunction with the sliding member, and a display surface facing the confirmation window is formed on the display member. A circuit breaker, part of which is exposed from the confirmation window.

(3) The display member is formed in the shape of a disk, and the circuit breaker case is provided with a circular accommodating portion for receiving the display member in a rotatable manner, and the sliding member is connected to the eccentric portion of the display member. Circuit breaker.

(4) The circuit breaker according to the above (2) or (3), wherein the display member is rotatable around an axis in the vertical direction with respect to the upper portion of the fast-terminal electrode.

(5) The front of the circuit breaker case has a terminal inlet for connecting the electric wire to the fast terminal electrode of the load terminal, a fitting groove for electrically connecting the measuring terminal of the instrument to the fast terminal electrode, and a cover for covering the fitting groove so as to be opened and closed. A circuit breaker, wherein a member is provided and the cover member is slidably mounted in the circuit breaker case.

(6) The terminal inlet and the fitting groove are installed side by side in the up and down direction, and both the terminal inlet and the fitting groove are formed in the cover member to form an opening of the length that can be exposed at the same time, and the cover member has both the terminal inlet and the fitting groove from the opening. A circuit breaker as described in (5) above, which slides from an open position exposing all and a closed position exposing only the terminal inlets from the opening.

(7) The circuit breaker according to the above (6), further comprising means for holding the cover member in an open position and a closed position.

(8) On the front of the circuit breaker case, a seal cover is provided to selectively cover the terminal inlet and the terminal inlet for connecting the electric wire to the fast terminal electrode of the load-side terminal, and the insertion part into which the seal cover is inserted into the terminal inlet and the front of the breaker case. And a joining portion for joining to the breaker case, the engaging portion for hanging the joining portion formed in the breaker case, and the insertion portion being fixed to the terminal inlet by the catching portion.

(9) The breaker case has a left and right pair of partitions to form a locking portion at the front edge of the partition, and the locking portion hangs the joint at the front of the breaker case in a state in which the left and right partitions are assembled. The circuit breaker of the above (8).

(10) Three load side terminals are arranged in the vertical direction, selectively covering the terminal inlet of one load side terminal with a sealing cover, and connecting the electric wire to the fastening terminal electrode through the terminal inlet of the other two load side terminals. The circuit breaker as described in said (8) or (9).

According to the circuit breaker of (1), the terminal inlet of the load-side terminal and the confirmation window for connection confirmation and the fitting groove for measurement test are arranged up and down on the front of the breaker case, so that the functionality of the load-side terminal is not thickened. There is an effect that can increase.

According to the circuit breakers of (2) to (4), the terminal inlet and the confirmation window are provided on the front of the breaker case, and the display member is rotated through the sliding member by the wire through the wire behind the confirmation window, so that the display of the terminal electrode on the load side is displayed. There is an effect that the breaker case can be made thinner by assembling the mechanism between the upper and lower terminal inlets.

According to the circuit breakers of (5) to (7), since the terminal inlet and the fitting groove for the measurement test are installed on the front of the circuit breaker case and the fitting groove is covered by the cover member so as to be opened and closed, the circuit breakers are installed side by side in the distribution panel. In this case, the measurement test can be easily performed from the front side of the breaker case, and there is an effect that it is possible to cover the fitting groove with a cover member to prevent incorrect connection of wires or inflow of dust.

According to the circuit breakers of (8) to (10), the terminal inlet is closed with a seal cover to fix the insertion part of the seal cover to the breaker case, so that the voltage switching mechanism can be concentrated on the front side of the breaker case so that the terminal is not used. There is an effect that the inlet can be securely closed with a sealing cover.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which actualized this invention to the circuit breaker for single-phase three-wire electric circuits is demonstrated based on drawing. 1-12 show the circuit breaker of Example 1, and FIGS. 13-16 show the circuit breaker of Example 2. FIG.

Example 1

As shown in FIG. 1, FIG. 2, the circuit breaker 1 of Example 1 is equipped with the circuit breaker case 2 made of synthetic resin. The circuit breaker case 2 is formed in the rectangular box shape combining the left and right part divisions 2a and 2b. On the upper surface of the circuit breaker case 2, the operation lever 3 which opens and closes an electric circuit is provided so that rotation is possible in the front-back direction. Three load side terminals 4 and a power supply side terminal 5 are arranged in a line in the vertical direction on the front and back of the circuit breaker case 2, respectively. Inside the breaker case 2, an overcurrent detecting mechanism and a breaking mechanism are provided (not shown), and when the overcurrent is detected, the electric circuit between the power supply terminal 5 and the load side terminal 4 is cut off.

3 to 5, the power supply side terminal 5 is a plug-in terminal, and the terminal electrode 6 is provided inside the rear cutout of the circuit breaker case 2, so that the conductor bar or the branch bar in the distribution panel ( (Not shown) with one touch. The front face of the circuit breaker case 2 is formed in the inclined shape which retracts to the upper side, and three load side terminals 4 are arrange | positioned at this inclined surface. Each load side terminal 4 is provided with a terminal inlet 7 on the front of the circuit breaker case 2 and a fastening terminal electrode 8 is provided inside the terminal inlet 7. Then, the electric wire 9 of the load wiring is inserted into the terminal inlet 7 and connected to the gripping portion 10 of the fast terminal electrode 8.

A confirmation window 11 for checking the connection state of the wire 9 to the fast-terminal electrode 8 is formed above the terminal inlet 7. In the lower part of the terminal inlet 7, the fitting groove 12 for inserting the measurement terminal (not shown) of various instruments is formed in the case of a conduction test, an insulation resistance measurement test, etc. A bent portion 13 is provided at the front end of the fastening terminal electrode 8 so as to face the fitting groove 12. The measuring terminal is inserted into the fitting groove 12 and electrically connected to the gripping portion 10 of the fastening terminal electrode 8 through contact with the bent portion 13. 3, the terminal cover 17 and the cover member (from the front of the breaker case 2, unlike FIG. 1, in order to clearly show the terminal inlet 7, the confirmation window 11 and the fitting groove 12). 18) is omitted.

In the partitions 2 a and 2 b of the breaker case 2, two mounting grooves 15 and 16 (refer to FIG. 5) before and after are formed on the inner surface of the front edge 14 so as to extend in the up and down direction. have. The front mounting groove 15 is slidably mounted with a terminal cover 17 for selectively opening and closing the inlet 7 which is the terminal of the load-side terminal 4. The cover member 18 for opening and closing the fitting groove 12 of the load side terminal 4 is slidably mounted in the mounting groove 16 at the rear side. The terminal cover 17 is joined to the front surface of the cover member 18, and a covering piece 19 covering a part of the terminal cover 17 is rolled up in the middle portion of the breaker case 2 in the vertical direction (Fig. 4). Reference).

As shown in Figs. 6, 8, and 9, the cover member 18 is formed of a thin board made of synthetic resin, which is formed up and down in length so that the lower open position (see Fig. 8) and the upper closed position (see Fig. 9). Slide between). In the cover member 18, the openings 20 of the same quantity as the load side terminals 4 are formed long vertically. The length of the opening part 20 is set to the length which the terminal inlet 7 and the fitting groove 12 can expose simultaneously. For this reason, the cover member 18 can be slid up and down in the state which connected the electric wire 9 to the load side terminal 4. As shown in FIG.

When the cover member 18 is slid to the open position, both the terminal inlet 7 and the fitting groove 12 are exposed from the opening 20 to the front of the breaker case 2 (see Fig. 8). When the cover member 18 is slid to the closed position, the fitting groove 12 is closed so that both of the terminal inlet 7 and the confirmation window 11 are exposed from the opening 20 to the front of the breaker case 2. (See Figure 9). Convex portions 21 are formed at right and left edges of the cover member 18 to fit into recesses (not shown) of the mounting groove 16 (see FIG. 6), and the cover members 18 are formed by the convex portions 21. Means are configured to hold the open position and the closed position.

7, 8, and 9, the terminal cover 17 is made of a thin board made of synthetic resin and formed shorter than the cover member 18. As shown in FIG. In the center portion of the terminal cover 17, a finger holder 22 for hanging a finger tip is formed when the terminal cover 17 is slid. An elastic locking piece 24 is formed at a side edge of one of the left and right sides of the terminal cover 17 by a deep cut notch 23 so that the recess of the mounting groove 15 is disposed at the lower end of the elastic locking piece 24. The projection 25 to be fitted) is formed. In the terminal cover 17, one of the three terminal inlets 7 is selectively closed to maintain the closed position by the projection 25.

The surface of the terminal cover 17 is provided with a display 26 of "100V" at the upper end and a display 27 of "200V" at the lower end. In the load terminal 4, the center terminal is used as the neutral terminal, and the upper and lower terminals are used as the voltage terminal. In order to obtain a voltage of 100 V, the electric wire 9 is inserted into the upper or lower terminal inlet 7 and the center terminal inlet 7, and the unused terminal inlet 7 is closed by the terminal cover 17. The display 27 of "200V" is hidden by the covering piece 19 (refer FIG. 8). When a voltage of 200 V is obtained, the electric wire 9 is connected to the upper and lower terminal inlets 7, the unused center terminal inlet 7 is closed by the terminal cover 17, and the display 26 of "100V" is obtained. Is hidden by the coating piece 19 (refer FIG. 9).

As shown in FIGS. 10-12, the mechanism which displays the connection state of the electric wire 9 with respect to the fast-terminal electrode 8 in the circuit breaker case 2 above the three load side terminals 4 is shown. ; 31) is installed. The display mechanism 31 includes a sliding member 32 which is moved by the end of the electric wire 8, a spring 33 (see FIG. 11) as an elastic member which returns the sliding member 32, and the sliding member 32. ) Is composed of a display member 34 which rotates in conjunction with

The sliding member 32 is formed in the side L shape, and is provided in the upper surface of the fastening terminal electrode 8 so that sliding is possible in the insertion direction (tilt front-back direction) of the wire 9. At the rear end of the sliding member 32, a contact piece 35 is formed at which the end of the electric wire 9 abuts, and the support shaft 36 protrudes at the front end of the sliding member 32. The recessed part 37 which accommodates the spring 33 is formed between the support shaft 36 and the contact piece 35. The rear end of the spring 33 hangs on the projection 38 of the breaker case 2 and the front end hangs on the projection 39 of the recess 37 so that the sliding member 32 moves forward by the elastic force of the spring 33. It is taxed.

The display member 34 is formed in a circular shape with a part cut out and is rotatably housed in the circular housing portion 40 of the circuit breaker case 2. In the eccentric portion of the display member 34, a connection hole 41 is formed to be connected to the support shaft 36 of the sliding member 32, so that the display member 34 is accommodated by the movement of the sliding member 32. Is rotated around an axis extending in the vertical direction. A display surface 42 (cylindrical surface) facing the confirmation window 11 of the circuit breaker case 2 is formed on the circumferential surface of the display member 34 so that a part of the display surface 42 is colored in a predetermined color. . As the display member 34 rotates, part of the display surface 42 is exposed from the confirmation window 11 to display the connection state of the electric wire 9 to the outside.

According to the circuit breaker 1 comprised as mentioned above, the following effect can be acquired.

(A) Since the confirmation window 11 and the fitting groove 12 are arranged vertically in front of the breaker case 2 with the terminal inlet 7 of the load-side terminal 4, the circuit breaker 1 is thinned. The display function and the measurement test function can be added to the load side terminal 4.

(B) The terminal inlet 7 and the confirmation window 11 are arranged side by side up and down so that the sliding member 32 is moved back and forth by the electric wire 9 behind the confirmation window 11 by the sliding member 32. Since the display member 34 is rotated, the breaker case 2 can be formed thinner by assembling the display mechanism 31 between the upper and lower terminal inlets 7.

(C) A support shaft 36 in which a disc-shaped display member 34 is accommodated in a circular accommodating portion 40, and a connection hole 41 formed in an eccentric portion of the display member 34 is integrated with the sliding member 32. ), The display mechanism 31 can be easily constituted by a few parts and can be reliably operated.

(D) Since the display member 34 is rotated around the axis in the up and down direction, the arrangement interval of the load side terminals 4 can be shortened and the overall height of the breaker case 2 can be kept low.

(E) Since the terminal inlet 7 and the fitting groove 12 are arranged side by side on the front of the circuit breaker case 2 so as to cover the fitting groove 12 so as to be opened and closed by the cover member 18, a plurality of circuit breakers ( When 1) is installed side by side in the distribution panel, the measurement test can be easily performed from the front side of the breaker case 2, and the fitting groove 12 is blocked by the cover member 18 in the case where the test is not normally performed. Incorrect connection of the electric wire 9 and entry of dust can be prevented.

(F) Since both of the terminal inlet 7 and the fitting groove 12 are formed in the cover member 18 with an opening 20 having a length that can be exposed, the terminal inlet 7 and the terminal inlet 7 can be opened at the open position of the cover member 18. The measurement test can be easily performed by exposing both of the fitting grooves 12, and exposing only the terminal inlet 7 at the closed position of the cover member 18 to the fitting grooves 12 of the electric wire 9. Connection can be prevented.

(G) The cover member 18 can be reliably held in the open position and the closed position by the convex portion 21.

Example 2

Next, Example 2 of the circuit breaker by this invention is demonstrated based on FIG. The circuit breaker 51 of the second embodiment is different from the circuit breaker 1 of the first embodiment with respect to the configuration of the member covering the inlet 7 which is the terminal of the load-side terminal 4. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the drawings, and description thereof will be omitted.

As shown in FIG. 13, the cover member 18 and the terminal inlet 7 which open and close the fitting groove 12 of the load side terminal 4 between the front ends of the dividers 2a and 2b of the breaker case 2. An optional cover cover 52 is mounted. The seal cover 52 has an insertion portion 53 inserted to be pulled out of the selected terminal 7 which is a selected terminal, and a joining portion 54 joined to the front surface of the breaker case 4, both of which are made of a synthetic resin material. It is molded integrally with each other (see Fig. 16).

The insertion part 53 is formed in a cylindrical shape and functions as a plug which closes the inlet 7 which is a terminal. The junction part 54 is narrower than the front width of the circuit breaker case 2, and is formed in the shape of a long rectangular plate of the length which can block the terminal inlet 7, the confirmation window 11, and the fitting groove 12. As shown in FIG. And in the state joined to the front surface of the circuit breaker case 2, the junction part 54 functions as a stopper which keeps the edge part of the insertion part 53 in the position which does not contact the fast-terminal electrode 8.

As shown in FIG. 15, a mounting groove 16 for mounting a cover member 18 and a mounting groove 15 for mounting a seal cover 52 are provided on the inner surface of the front end edge 14 of the divided bodies 2a and 2b. And a locking portion 55 for fitting the joining portion 54 of the seal cover 52. The locking portion 55 is formed at a right angle at the front end edge 14 so as to cover the entire surface of the bonding portion 54. Then, the left and right locking portions 55 engage the left and right edges of the joining portion 54 in front of the breaker case 2 in the state of assembling the divided bodies 2a and 2b, and insert the insertion portion 53 into the terminal inlet 7 Is fixed to the

In the circuit breaker 51 of the second embodiment, when a voltage of 100 V is obtained, as shown in FIGS. 14A and 14B, the load-side terminal 4 of the lower side or the upper side is sealed with a sealing cover 52. The wire 9 is connected to the fast-terminal electrode 8 through the terminal inlet 7 of the remaining two load side terminals 4, covering the terminal inlet 7. In the case of obtaining a voltage of 200 V, as shown in Fig. 14 (c), the sealing cover 52 covers the terminal inlet 7 of the center load side terminal 4 and the terminal inlet 7 of the two upper and lower load side terminals 4 is covered. The wire 9 is connected to the fast-terminal electrode 8 through).

According to the circuit breaker 51 configured as described above, the following effects can be obtained.

(H) The voltage switching mechanisms of the three load side terminals 4 are integrated on the front side of the breaker case 2 so that the circuit breaker 51 can be formed in a small and thin shape.

(I) The terminal 7 inlet 7 of the load-side terminal 4 which is not used can be closed by the sealing cover 52 to prevent the erroneous connection of the electric wire 9.

(J) Since the sealing cover 52 is attached to the front of the breaker case 2, the voltage switching operation can be easily performed without removing the circuit breaker 51 from the distribution panel.

(K) Since the junction 54 of the seal cover 52 was hooked in front of the breaker case 2 by the catching portion 55, the seal cover 52 was irrespective of the installation angle of the distribution panel or the circuit breaker 51. Can be prevented from falling off.

This invention is not limited to the said embodiment, It is also possible to change suitably and implement the structure of each part in the range which does not deviate from the meaning of invention as illustrated below.

(1) In the circuit breaker 1 shown in FIG. 1, the load side terminal 4 above or below the front of the breaker case 2 is used as a neutral electrode.

(2) In the circuit breaker 1 shown in FIG. 3, the load-side terminal 4 is composed of two terminals, and the two terminal inlets 7, the confirmation window 11, and the fitting groove 12 are respectively placed up and down. Arranged by incense.

(3) In the circuit breaker 1 shown in FIG. 5, the front face of the breaker case 2 is formed vertically, and the load side terminal 4 is provided horizontally.

(4) In the terminal cover 17 shown in FIG. 7, the display 26 of "100V" and the display 27 of "200V" are colored with a different color, respectively.

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

2 is a front view of the circuit breaker.

3 is a perspective view showing a load side terminal structure of the circuit breaker.

4 is a perspective view showing the internal structure of the circuit breaker.

Fig. 5 is a side view showing the internal structure of the circuit breaker.

6 is a perspective view illustrating a cover member of the circuit breaker.

7 is a perspective view illustrating the terminal cover of the circuit breaker.

8 is a perspective view of a circuit breaker at the time of 100 V output.

9 is a perspective view of the circuit breaker at the time of 200V output.

FIG. 10 is an enlarged view of a portion A of FIG. 5.

FIG. 11 is a cross-sectional view taken along the line BB of FIG. 5. FIG.

12 is an exploded perspective view showing a display mechanism of a load side terminal.

Fig. 13 is an exploded perspective view of a circuit breaker showing Embodiment 2 of the present invention.

14 is a front view of a circuit breaker showing a voltage switching method by a seal cover.

15 is a cross-sectional view taken along the line CC of FIG. 14.

16 is a perspective view of the seal cover.

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

1-- circuit breaker (Example 1), 2-breaker case,

3-control lever, 4-load-side terminals,

5-terminal on the power supply side, 7-terminal inlet on the terminal on the load side,

8-fastener electrode, 9-wire,

11-confirmation window, 12-fitting groove,

17-terminal cover, 18-cover member,

20-openings, 31-marking mechanism,

32-sliding member, 33-spring,

34-indicator, 40-receptacle,

42-display surface, 51-circuit breaker (Example 2),

52-seal cover, 53-insert,

54-splice, 55-catch.

Claims (10)

In the circuit breaker in which the operation lever which opens and closes an electric circuit on the upper surface of a circuit breaker case is arranged, and the load side terminal and the power supply terminal were arranged in the up-down direction, respectively in the front and back of a circuit breaker case, A terminal inlet is provided on the front of the breaker case for connecting the electric wire to the fast terminal electrode of the load side terminal, and a confirmation window for checking the connection status of the wire is formed above the terminal inlet, and the instrument is measured under the terminal inlet. A circuit breaker comprising a fitting groove for electrically connecting a terminal to a fast terminal electrode. In the circuit breaker in which the operation lever which opens and closes an electric circuit on the upper surface of a circuit breaker case is arranged, and the load side terminal and the power supply terminal were arranged in the up-down direction, respectively in the front and back of a circuit breaker case, On the front of the breaker case, a terminal inlet for connecting the wire to the fast terminal electrode of the load side terminal and a confirmation window for checking the connection state of the wire are formed.In the inside of the breaker case, a sliding member and a sliding member moved by the end of the wire are moved. An elastic member for returning the member and a display member which rotates in association with the sliding member, and a display surface opposed to the confirmation window is formed on the display member so that a part of the display surface is exposed from the confirmation window as the display member is rotated. Circuit breaker characterized by. 3. The circuit according to claim 2, wherein the display member is formed in a disc shape, a circular accommodating portion is formed in the circuit breaker case to receive the display member in a rotatable manner, and a sliding member is connected to an eccentric portion of the display member. breaker. 4. The circuit breaker according to claim 2 or 3, wherein the display member is rotatably provided about an axis in the vertical direction with respect to the upper portion of the fast terminal electrode. An operation lever for opening and closing an electrical circuit is provided on the upper surface of the circuit breaker case, and a circuit breaker in which a plurality of load side terminals and a power supply terminal are arranged in the vertical direction on the front and rear surfaces of the circuit breaker case, respectively. The cover member can be slid from the breaker case by installing a terminal inlet for connecting the quick terminal electrode of the terminal, a fitting groove for electrically connecting the measuring terminal of the instrument to the quick terminal electrode, and a cover member for covering the fitting groove so as to be opened and closed. Circuit breaker, characterized in that the mounting. 6. The terminal of claim 5, wherein the terminal inlet and the fitting groove are installed side by side in an up and down direction, and both the terminal inlet and the fitting groove are formed in the cover member to form an opening having a length that can be simultaneously exposed, and the cover member is formed from the opening and the terminal inlet. And a slide between the open position exposing both of the fitting grooves and the closed position exposing only the terminal inlet from the opening. The circuit breaker according to claim 6, further comprising means for maintaining the shock cover member in an open position and a closed position. An operation lever for opening and closing an electrical circuit is provided on the upper surface of the circuit breaker case, and a circuit breaker in which a plurality of load side terminals and a power supply terminal are arranged in the vertical direction on the front and rear surfaces of the circuit breaker case, respectively. A terminal inlet for connecting to the fast-terminal electrode of the terminal and a seal cover for selectively covering the terminal inlet, and an insertion part for inserting the seal cover into the terminal inlet and a junction part for joining the front of the breaker case to the junction part in the breaker case. And a hanging portion formed, and the insertion portion is fixed to the terminal inlet by the locking portion. The breaker case according to claim 8, wherein the breaker case has a left and right pair of partitions, forms a locking portion at the front edge of the partition, and in a state in which the left and right partitions are assembled, the locking portion hangs the joint at the front of the breaker case. Circuit breaker, characterized in that. 10. The fastening terminal according to claim 8 or 9, wherein three load side terminals are arranged in an up and down direction, selectively covering the terminal inlet of one load side terminal with a sealing cover, and fastening the electric wire through the terminal inlet of the other two load side terminals. A circuit breaker characterized in that connected to the electrode.

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