JPH0113318Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an earth leakage or disconnection device that detects leakage current flowing in an electrical circuit and interrupts the electrical circuit. When power is connected to the output terminal, the contact of the switching mechanism is opened due to an earth leakage accident, and the power supply to the amplifier and electromagnet device is not cut off. The purpose of this invention is to reduce the damage caused by this, and to increase the opening/closing distance of the movable contact plate that cuts off the power supply, thereby improving contact reliability.

The present invention will be described below with reference to FIGS. 1 to 17, which are diagrams of an earth leakage circuit and disconnection circuit as an embodiment. In Figs. 1 to 6, reference numeral 1 denotes a device for leakage or disconnection, which is composed of a container stand 2 and a lid 3, both made of synthetic resin, which are fixed to each other with eyelets 4. . Reference numeral 5 denotes an input terminal device installed at the upper end of the device stand 2, which includes a box-shaped terminal fitting 7 provided with a tightening screw 6, a terminal plate 8 with one end inserted into the terminal fitting 7, and a terminal plate 8 having one end inserted into the terminal fitting 7. It consists of a pad 9 with a bent piece inserted between the terminal plate 8 and the terminal screw 6, and a fixed contact 10 is provided at the other end of the terminal plate 8, that is, at the lower end in FIGS. 3 and 5. . Then, the terminal device 5 is fitted into the recess 11 formed in the holder 2, and the terminal plate 8 is fixed to the holder 2 with the rivets 12. 13 is a movable contact that comes into contact with and separates from the fixed contact 10; 14 is a contact plate provided with the movable contact 13 at the free end located at the upper side in FIGS. 3 and 5; Edge 1
4a on the device stand 2 where the fixed contact 10 side is higher.
The movable contact 13 at the free end of the contact plate 14 has a required opening width between it and the fixed contact 10. Moreover, this contact plate 14 is constructed by arranging two plates in parallel to have sufficient elasticity. 1
Reference numeral 7 denotes a bimetal which is displaceable in response to overcurrent and is provided as an overcurrent detection element, and one end 17a on the proximal side thereof is fixed on the instrument base 2 together with the contact plate 14 with the fixing screw 16. The other end 17b, which is a free end and serves as an output section as the overcurrent detection element, extends perpendicularly to the table, that is, forward in FIG. 3 and rightward in FIG. 5. 1
Reference numeral 8 denotes an output terminal device installed at the lower end of the device stand 2, which has almost the same structure as the input terminal device, and is a box-shaped terminal fitting equipped with a tightening screw 6 as shown in Fig. 5. 7, a terminal plate 8 with one end inserted into the terminal fitting 7, and a stopper 9 with a bent piece inserted between the terminal plate 8 and the terminal screw 6.
It is bent into a letter shape, and the other end is directed perpendicularly to the container stand 2, that is, toward the front in FIG. 3 and toward the right in FIG. This terminal device 18 is fitted into a recess 19 provided in the container stand 2 and is prevented from coming off by the lid 3. A braided wire 20 has one end joined to the vicinity of the other end 17b of the bimetal 17, and the other end joined to the other end of the terminal plate 8 of the terminal device 18. Thus, the fixed contact 10, the movable contact 13, the contact plate 14, the bimetal 17, and the braided wire 20 are connected to the input terminal device 5.
The output terminal device 18 is electrically connected to the output terminal device 18 to form an electric path. Therefore, the above-described one is considered to be one pole, and the required number of poles are arranged at regular intervals on the table 2 in the horizontal direction as shown in FIG. 3, and the drawings of the embodiment represent a two-pole type. 21 is braided wire 2
It is a tube coated with 0 and is insulated from other poles. Between the input terminal device 5 and the output terminal device 18 of this device stand 2, there is an electromagnet device 22 on the upper side, that is, on the input terminal device 5 side, and an opening/closing mechanism section 2 in the center.
3. Zero-phase current transformer 2 is installed at the bottom, that is, on the output terminal device 18 side.
4 and a detection block 26 of an amplifier 25 are arranged. First, the opening/closing mechanism section 23 located at the center of the container stand 2 will be explained with reference to the block perspective view shown in FIG. 14 and the exploded perspective view shown in FIG. 15. Reference numeral 27 is a foldable handle; The center is supported by a support shaft 28, one of which serves as a handle 27a and protrudes from the window hole 3a of the lid 3, and the other serves as a cam portion 27b. 29 is supported on a support shaft 28 by a return spring of the handle 27. 30 is handle 2
7. A frame body in which other opening/closing mechanism parts 23 are housed, and is composed of both side plates 31 and a bottom plate 32. A handle 27 is located between the both side plates 31, and a support shaft 28 is supported. In the case of the bipolar type of the embodiment, this frame body 30 is located between the two poles, and in the case of the three-polar type, it is located directly above the central pole. Reference numeral 33 denotes a fixing screw 3 that passes through the table 2 through a screw hole provided in the bottom plate 32.
4 are screwed together as shown in FIG. Reference numeral 35 denotes a partition wall located on both sides of the both side plates 31 of the frame body 30, which is formed integrally with the device stand 2 and is intended as a partition wall between both movable contact plates 14. 36 is the side plate 3 of the frame body 30
The elongated notch 37 provided in the handle 27 is a U-shaped link, and one end 37a is inserted into the cam portion 27b of the handle 27, and the other end 37b is inserted into the elongated notch 36. Therefore, when the handle 27 is reversed, the cam portion 27b is vertically reversed with respect to the support shaft 28, and the other end 37b of the U-shaped link 37 is aligned with the elongated notch 36.
It moves back and forth. The connecting portion 37c of this U-shaped link 37 is covered with an insulating tube 37d.One end 29a of the return spring 29 of the handle 27 is caught in a recess 38 provided in the handle 27, and the other end 29b is The handle 27 is always operated in the opening direction by being hooked onto a bent piece 39 formed on the side plate 31 of the frame 30. Reference numeral 40 denotes a swing plate located between the side plates 31, with the center connected to the U-shaped link 37.
The other end 37b is pivotally supported. Therefore, the rocking plate 4
0 is caused by the movement of the other end 37b of the link 37. 41 is a hole in the cam portion 27b of the handle 27 through which one end of the link 37 is inserted, and 42 is a hole in the rocking plate 40 through which the other end of the link 37 is inserted. Reference numeral 43 denotes a movable frame that extends between both contact plates 14 and presses both contact plates 14 at the same time, and is made of an insulating material.
It is located between the two and moves horizontally. This movable frame 43 slides in a horizontal groove 44 formed on the table 2,
Moreover, one end 43a is held down by the tip 40a of the swing plate 40. Reference numeral 45 denotes a tripping frame formed in a substantially Y-shape, and one end 45a is connected to both side plates 31 of the frame body 30.
The other end 45 is pivotally supported by a pin 46 supported by the
b extends over the bimetal 17 at both poles and is located below the other end 17b of these bimetal 17.
Reference numeral 47 denotes a screw threaded onto the other end 45b of the tripping frame 45, which adjusts the distance between the bimetal 17 and the other end 17b to change the interrupting operation characteristics of the opening/closing mechanism section 23.
48 is a screw hole into which the screw 47 is screwed; 49 is a receiving stage located approximately in the middle of the tripping frame 45;
When the rear end 40b of the handle 27 is turned to the on side, the latch is engaged. Reference numeral 50 denotes a stopper at the rear end 40b of the swing plate provided on the tripping frame 45. The rear end 40b is located between the stopper 50 and the receiving stage 49, and the rear end 40b is located between the stopper 50 and the receiving stage 49, and the opening/closing mechanism section 23 is changed from the closed pole to the open pole. This prevents the rear end 40b of the swing plate 40 from jumping up when the swing plate 40 is turned. Reference numeral 51 denotes a spring that always presses the tripping plate 45 in the counterclockwise direction in FIG.
is applied to the bottom plate 32 of the frame body 30, and the other end 51b is applied to the tripping frame 45. 52 is a recess formed in one end 45a of the tripping frame 45 into which the spring 51 is fitted; 53 is a recess formed in the center when the other end 45b of the tripping frame 45 is made into a U-shape; is frame body 30
The side plates 31 of the handle 27 are fitted into the handle 27, and the handle 27 moves therein. 54 is an insulating plate interposed between the partition wall 35 of the table 2 and the frame 30;
It has the same shape as the side plate 31 of No. 0. Thus, the contacts 10 and 13, the contact plate 14, and the handle 2
7, the link 37, the swing plate 40, the tripping frame 45, etc. constitute the opening/closing mechanism section 23.

Next, refer to the perspective view shown in FIG. 16 and the exploded perspective view shown in FIG. To explain, the braided wire 2 is inserted into the hole 55 formed in the center of the zero-phase current transformer 24.
0 is inserted through the braided wire 20, and when the current becomes unbalanced, that is, when a leakage current flows, a magnetic flux is generated in the annular core 56 of the zero-phase current transformer 24, and a magnetic flux is generated in the coil 57 wound around the annular core. A voltage is generated and a secondary output is induced. 58 is its secondary output lead wire, the terminal of which is connected to the amplifier 25. The zero-phase current transformer 24 and amplifier are connected to the opening/closing mechanism section 23.
It is housed in a box 59 made of synthetic resin with an open side, and is enclosed and fixed with a filler 60 such as epoxy to form one block, the opening/closing mechanism section 23 of the instrument stand 2.
The output terminal device 18 is fitted into a recess 61 formed between the output terminal device 18 and the output terminal device 18 . The specific shape of the parts installed in the box 59 will be explained below.The zero-phase current transformer 24 is placed in front of the box 59, that is, in FIGS. On the right, in FIGS. 16 and 17, the upper peripheral wall 6
2a, and the amplifier 25 is installed at the back of the box, that is, as shown in FIGS. In the figure, it is placed in parallel contact with the left side peripheral wall 62b, and in FIGS. 16 and 17, the lower peripheral wall 62b. In addition, a step 63 is provided on the front right side of the box 59, and a test current limiting resistor 64 is attached vertically to the step 63, and the upper terminal 64a of the resistor 64 is bent to face downward. They are arranged on the right side of the peripheral wall 62a. 65 is a holding piece formed integrally with the box 59 that holds the resistor 64, and the side surface 63 formed when the stepped portion 63 is formed.
The resistor 64 is held by the holding pieces 65 and a and 63b. Reference numeral 66 denotes a holding piece formed integrally with the box 59 at the upper and lower ends of the box 59, which has a hole 67 through which the upper terminal 64a of the resistor 64 is inserted. After inserting the holding piece 66 at the lower end, the terminal 64a of the resistor 64 is bent to prevent it from coming out, and the space between the holding pieces 66 of the terminal 64a becomes a fixed contact for the test switch. Further, the terminal 64a is plated with an environmentally resistant metal such as nickel to improve contact reliability. Reference numeral 68 denotes a movable contact plate for the test switch, and the contact portion 68a is inserted from the left into the hole 70 of the holding piece 69 formed at the left end of the peripheral wall 62a in front of the box 59.
At 8b, the holding piece 69 is fitted, and a cutout hooking piece 68c formed on the base 68b is hooked and fixed to the holding piece 69. Furthermore, one end of the lead wire 71 is connected to the connecting piece 68c provided on the base 68b, and the lead wire 71 is inserted through the hole 55 of the zero-phase current transformer 24, and the other end is connected to the printed wiring board 63 of the amplifier 25. Connecting.
Reference numeral 72 indicates a hole in the box 59 that communicates with the hole 55 of the zero-phase current transformer 24. Reference numeral 73 designates a test button provided on the lid body 3. The button portion 73a is housed in a concave portion 74 formed at the lower end of the window hole 3a for protruding the handle 27 of the lid body 3, with the button portion 73a protruding forward. A pair of legs 73b having a hook piece at the rear end are inserted into the formed hole 75, and by pressing the test button 73, the rear end of the legs 73b connects the contact portion 68a of the movable contact plate 68 to the resistor 64. The test switch approaches and contacts the upper terminal 64a, and the test switch is closed. or,
The test button 73 returns to its original state due to the restoring force of the movable contact plate 68. Reference numeral 76 denotes a surge absorber that absorbs shock voltage or surge voltage, and is located internally at the rear of a partition wall 77 that partitions off a predetermined space behind the stepped portion 63 of the box 59. The wire 78 and a power supply lead wire 79, one of which is drawn out from the printed wiring board 63 of the amplifier 25 and which is electrically connected to the lead wire 71 of the movable contact plate 68, are inserted into the space formed by the partition wall 77 and the box is opened. 59, the lead wires 78 of the surge absorber 76 are connected to the other ends of the terminal plate 8 of the output terminal device 18, and the lead wires 79 of the amplifier 25 are connected at one end to the lower terminal 64b of the resistor 64. , and insert the other wire, together with the braided wire 20 and the lead wire 71 of the movable contact plate 68, through the hole of the box 59 and the hole 55 of the zero-phase current transformer 25, and insert the drawer stand 2 above the box 59. Lead to the back. Reference numeral 80 denotes an insulating plate interposed between the contact plate 14, the opening/closing mechanism section 23, and the detection block 26. One plate is bent and stacked, and one side is brought into contact with the upper side wall of the recess 61 of the instrument stand 2. and the other side is in contact with the upper side surface of the detection block 26. Therefore, the zero-phase current transformer 24, the amplifier 25, and the box 5
9, a resistor 64, a movable contact plate 68, and the like constitute a detection block 26.

Next, the electromagnet device 22 disposed on the upper part of the instrument stand 2, that is, on the side of the input terminal device 5, will be explained with reference to the perspective view shown in FIG. 12 and the exploded perspective view shown in FIG. 82, 83, a front plate 84 connecting the front ends of the side plates 82, 83, a right side plate 85 hanging backward from the right end of this front plate 84, a bottom plate 86 bent from the rear end of this right side plate 85, and this bottom plate 86. Support plate 87 bent backward from the left end of
A fixing plate 88 bent from the rear end of the support plate 87
A screw hole 89 is provided in the fixing plate 88, and a fixing screw 90 passing through the instrument stand 2 is screwed together as shown in FIG. 6, and is fixed to a stepped portion 91 formed on the instrument stand 2.
This stepped portion 91 serves to isolate each pole of the contacts 10 and 13. 92 is a coil frame, upper and lower side plates 93,
94 and a cylinder 95 that connects the upper and lower side plates 93 and 94 at the center, and a coil 96 is wound around this cylinder 95 by being fitted into the upper and lower side plates 93 and 94. 97 is a lead wire connected to the terminal of this coil 96; 98 is the upper and lower side plates 93, 94 of the coil frame 92;
and a hole that communicates with the cylinder 95. This coil frame 92 is fitted and attached to the upper and lower side plates 82, 83, front plate 84, right side plate 85, and bottom plate 86 of the yoke 81. 99 is a fixed core fixed to the lower plate 83 of the yoke 81; 100 is a movable core corresponding to the fixed core 99; 101 is a return spring interposed between the fixed core 99 and the movable core 100; It is installed in the hole 98 of. Reference numeral 102 denotes an actuating plate, which is composed of a base 103, a shaft portion 104 extending upward from the rear end of this base 103, and an actuating portion 105 extending downward from the front end.
This shaft portion 104 is inserted into a hole 106 passing through the fixed core 99 and fixed to the movable core 100. This fixing method is based on the hole 107 formed in the movable core 100.
Insert the shaft portion 104 into the yoke 8 as shown in FIG.
1 through the hole 108 in the upper plate 82 of the movable iron core 10.
Perform welding and soldering on the upper side of 0. Of course, it may be fixed with screws or caulking. The return spring 101 applies a force to the movable core 100 in a direction away from the fixed core 9, and the movable core 100 is stopped with the base 103 of the operating portion 105 in contact with the lower plate 83 of the yoke 81. When current flows through the coil 96 in this state, magnetic flux is generated between the fixed core 99, the lower plate 83, the front plate 84, the upper plate 82, the movable core 100, and the space between the return spring 101, and the movable core 100 and the fixed core 99, a magnetic attraction force is generated between the movable iron core 1
00 moves toward the fixed iron core 99 against the spring force of the return spring 101, and the actuating plate 102 moves accordingly. Further, when the current in the coil 96 is cut off, the restoring force of the return spring 101 returns to the original state. Further, the actuating portion 105 of the actuating plate 102 is moved toward the other end 4 of the tripping plate 45 of the opening/closing mechanism portion 23 in this operating direction.
5b, and the other end 4 of the tripping frame 45 is moved by the movement of the actuating plate 102, that is, by pushing it downward.
5b. 109 is yoke 81
The lead wire 9 of the coil 96 formed on the support plate 87 of
The hole 7 is inserted through, and the hole 110 is the lower plate 8 of the yoke 81.
3, which is a restraining piece cut and raised from opening/closing mechanism part 2.
This stops the forward movement of the tip 40a of the swing plate 40 of No. 3. Therefore, the lead wire 97 of the coil 96
is inserted through the instrument stand 2 and guided to the back surface, and one end is connected to the other of the power supply lead wires 79 of the amplifier 25. 111 is a tube that insulates this connection. Furthermore, the other side is a contact plate 14 as shown in FIG.
Fixed contact piece 1 located at the rear of the device and fixed to the device stand 2
Connect to 12. This fixed contact piece 112 corresponds to a movable contact plate 113 to which the movable contact 13 side is fixed at the same time as the movable contact 13 is fixed to the contact plate 14, and when the contacts 10 and 13 are closed, this movable contact plate 113 comes into fixed contact. It contacts the piece 112 and closes the contact 10,
13, the movable contact plate 113 connects to the fixed contact piece 1.
Separate from 12. Therefore, the yoke 81 and the coil 9
6, coil frame 92, fixed core 99, movable core 10
0, a return spring 101, an actuating plate 102, etc. constitute an electromagnet device 22. Reference numeral 114 denotes a lead wire whose one end is connected to the lower terminal 64b of the resistor 64 of the detection block 26, and whose other end is connected to the output terminal of a pole different from the pole on which the fixed contact piece 112 and the movable contact plate 113 are arranged. Connect to the other end of the terminal plate 8 of the terminal device 18. 115 is a back cover that covers the recess 116 of the table 2;
Reference numeral 17 denotes a mounting hole for an earth leakage or disconnection switch formed in the table 2.

Next, the operation of the above earth leakage breaker will be explained. Figures 5 and 6 show contact 1 in an open state.
0 and 13 are open. Further, the swing plate 40 is located along with the link 37 on the handle 27 side, that is, on the right side in the figure. To close the pole from the above state, as shown in FIGS. 7 and 8, the handle 27a of the handle 27 is reversed upward in the figure and the handle 27 is rotated counterclockwise in the figure. Cam part 27
b is reversed and this is accompanied by link 37, and this link 3
The other end 37b of 7 moves in the elongated notch 36 in the direction of the table 2. Therefore, the swinging plate 40 pivotally attached to the other end 37b attempts to move in the direction of the contact plate 14 as a whole, but the rear end 40b first hits the receiving stage 49 of the tripping frame 45, causing the latch to close. Therefore, the subsequent movement of the rocking plate 40 is caused by the tip 40
The movable frame 43 is pushed toward the device stand 2 by the tip 40a, and the contact plate 14 is similarly pushed down toward the device stand 2. For this reason, the contact plate 14
With this movement, the contacts 10 and 13 are brought into contact, and this state is maintained by positioning one end 37a of the link 37 beyond the handle shaft 28 at the lower side in the figure. Of course, when opening the pole, the handle 27a of the handle 27 is flipped downward as shown in FIGS. 5 and 6, and one end 37a of the link 37 is aligned with the handle shaft
The link 37 is moved so that the contact plate 14 is returned to its restoring force by its own restoring force, and the contacts 10 and 13 are opened. Therefore, contact 1
When 0 and 13 are joined, the movable contact plate 113 is joined to the fixed contact piece 112, and one lead wire 97 of the coil 96 of the electromagnet device 22, the coil 96 of the electromagnet device 22, and the other lead wire 9 of this coil 96 are connected.
7. A voltage is applied to the amplifier 25 via the other lead wire 79 of the amplifier 25, one lead wire 79 of the amplifier 25, and the lead wire 114.
Subsequently, when a leakage occurs in the closed state shown in FIGS. 7 and 8 above, the zero-phase current transformer 24 detects the unbalanced current, and this secondary output is amplified by the amplifier 25. The lead wires 79 of the amplifier 25 are short-circuited, and a current is passed through the coil 96 of the electromagnet device 22.
The actuating portion 105 of the actuating plate 102 is shown by the chain line in the figure.
The other end 45b of the tripping frame 45 is struck and pushed. As a result, the tripping frame 45 is reversed downward from the state shown in FIGS. 7 and 8, and the rear end 40b of the rocking plate 40 is released by the relief of the receiving stage 49, and the latch is released, and the rear end 40b is the device stand 2 at once
Since the tip 40a moves to the side, the tip 40a moves to the handle 27 side, that is, to the right in the figure, releasing the pressure on the movable frame 43, and the contact plate 14 returns by its own restoring force, and the contact plate 10,
13 to open the polarity. At this time, the movable contact plate 113 separates from the fixed contact piece 112, and the power supply to the coil 96, amplifier 25, etc. of the electromagnet device 22 is stopped. Therefore, when implementing the overcurrent prevention type earth leakage breaker configured as described above, even if a load is connected to the input terminal and a power source is connected to the output terminal due to incorrect wiring, the opening/closing mechanism 23 may open due to an earth leakage accident. However, the power supply to the amplifier 25 etc. will not be cut off, and the parts of the amplifier etc. will not be destroyed due to insufficient withstand voltage. Of course, when the button part 73a of the test button 73 is pressed to the left in the closed state shown in FIGS. 7 and 8, the movable contact plate 68 contacts the upper terminal 64 of the resistor 64.
a, the lead wire 114, the resistor 64, the movable contact plate 68, the lead wire 71 of the movable contact plate 68, the other lead wire 79 of the amplifier 25, the other lead wire 97 of the coil 96 of the electromagnet device 22, This coil 9
6. A current flows through the other lead wire 97 of this coil 96, the fixed contact piece 112, and the movable contact plate 113 to generate an unbalanced current in the zero-phase current transformer 24 to perform an operation test of the earth leakage breaker. Also, an overcurrent flows in the closed state shown in Figs. 7 and 8, causing the bimetal 17 to
When the bimetal 17 responds to self-heating due to self-heating, the overcurrent here causes the bimetal 17 to displace downward in the figure, as shown in FIGS. The rotation is reversed clockwise, the swing plate 40 moves, and the contacts 10 and 13 are opened. After the contacts 10 and 13 are opened, the handle 2
7 is reversed by the spring force of the return spring 29, and the other end 37b of the link 37 moves within the elongated notch 36 in the direction of the handle 27 along with the cam portion 27b. Therefore, the rocking plate 40 pivotally attached to the other end 37b tries to move in the direction of the handle 27 as a whole, but its tip 40a hits the restraining piece 110 formed on the yoke 81 of the electromagnet device 22. Therefore, the subsequent movement of the rocking plate 40 is only the rear end 40b, which moves toward the handle 27 and stops at a position between the stopper 50 of the tripping frame 45 and the receiving stage 49, and the fifth The state becomes open as shown in FIG. 6 and FIG.

As described above, the present invention provides contact points 10 and 1 provided in the electric circuit.
A contact plate 14 on the movable side of 3 has one end 14a as a fixed end and the other end as a free end to which a movable contact 13 is fixed, and the intermediate part acts to open and close the contacts 10 and 13.
The movable contact 13 is fixed to the closed pole side surface of the contact plate 14 so that one end is fixed, and the free end is fixed to the closed side surface of the contact plate 14.
4, the fixed end 14a of the contact plate 14 is
A movable contact plate 113 located on the side is arranged in parallel, and a fixed contact piece 112 is provided which separates from the free end of this movable contact plate 113. Since power is supplied to the electromagnet device 22, the power is supplied and cut off in response to the opening and closing operations of the contacts 10 and 13, so even in the case of so-called reverse connection, where a load is connected to the input terminal and a power supply is connected to the output terminal, there is no leakage. In the event of an accident, the opening/closing mechanism section 23 will not supply power to the amplifier 25 and electromagnet device 22 while opening the contacts 10 and 13, thereby reducing burnout due to continued energization of the amplifier 25 and electromagnet device 22. Further, the movable contact plate 113 has one end fixed to the movable contact 13 side across the opening/closing point of the contact plate 14, and the other end is a free end that separates from the fixed contact piece 112, so that in the process of closing the contact plate 14. When the movable contact 13 comes into contact with the fixed contact 10 and the contact plate 14 is further closed to ensure this contact pressure, the contact plate 14 is bent to the opposite side. The contact plate 113 becomes more movable under the influence of the curvature of the point of action of the contact plate 14 around the fixed end.
Since the free end increases the movement width by lever action and comes into contact with the fixed contact piece 112, the movable distance of the free end is larger than, for example, when one end of the movable contact plate 113 is fixed to the fixed end of the contact plate 14. Become,
This has the effect of improving the contact reliability between the movable contact plate 113 and the fixed contact piece 112.

[Brief explanation of the drawing]

Figures 1 to 17 show an embodiment of the current leakage and disconnection switch of the present invention, with Figure 1 being a front view, Figure 2 being a left side view, and Figure 3 being a front view with the lid removed. , FIG. 4 is a cross-sectional view taken along line A-A showing the open state in FIG. 1, FIG. 5 is a cross-sectional view taken along line B-B showing the open state in FIG. 1, and FIG. 6 is the open state shown in FIG. FIG. 7 is a BB sectional view showing the closed state in FIG. 1, FIG. 8 is a CC sectional view showing the closed state in FIG. FIG. 10 is a sectional view taken along C-C showing the removed state in FIG. 1, FIG. 11 is a perspective view with the lid removed, and FIG.
2 is a perspective view of the electromagnet device, FIG. 13 is an exploded perspective view of the electromagnet device, FIG. 14 is a perspective view of the opening/closing mechanism, FIG. 15 is an exploded perspective view of the opening/closing mechanism, and FIG.
The figure is a perspective view of the detection block, and FIG. 17 is an exploded perspective view of the detection block. 1... vessel body, 2... vessel stand, 3... lid body, 10...
...Fixed contact, 13...Movable contact, 14...Contact plate, 22...Electromagnet device, 23...Opening/closing mechanism section,
24... Zero-phase current transformer, 25... Amplifier, 26...
Detection block, 27...handle, 112...fixed contact piece, 113...movable contact plate.

Claims (1)

[Scope of utility model registration request] A zero-phase current transformer that detects leakage current flowing in an electric circuit, an amplifier that amplifies the secondary output of the zero-phase current transformer, and an electromagnetic device that operates in response to the output of the amplifier. The contact provided in the electric circuit can be opened and closed by operating a handle, and when the contact is closed, a latch is released by the operation of the electromagnetic device, and when the latch is released, the contact is opened. In a switch or a disconnector, a contact plate is provided on the movable side of the contact, with one end being a fixed end and the other end being a free end to which a movable contact is fixed, and the intermediate part is actuated to open and close the contact. A movable contact plate is arranged in parallel, one end of which is fixed to the surface on the closing pole side by the fixation of the movable contact, and the free end is positioned closer to the fixed end of the contact plate than the opening/closing point of the contact plate. A current leakage and disconnection switch is provided with a fixed contact piece that separates from a free end of a contact plate, and power is supplied to the amplifier and the electromagnet device via the fixed contact piece and the movable contact plate.