JP2724027B2 - Circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a circuit breaker applied to a single-phase three-wire circuit or the like.

[Conventional technology]

A conventional single-phase three-wire power distribution board is shown in FIG. Voltage and neutral bars 101,1 on main circuit breaker 100
02 is connected to the neutral pole bar 102, and the other end of the neutral pole bar 102 is connected to the neutral pole terminal block 103.
01 is connected to the power supply side of the single-pole circuit breaker 104. In addition, two electric wires 106 and 107 of a cable 105 are connected from the load circuit to the load side of the single-pole circuit breaker 104 and the neutral pole terminal block 103 in the distribution board, respectively.

As shown in FIG. 6, for example, the single-pole circuit breaker 104 includes a case 112, a pair of voltage pole terminals 108, 109 provided in the case 112, and a voltage electrode terminal 108, 109 built in the case 112. Abnormal current detection means 1 connected in series
11 and a voltage pole contact portion 110, and a trip link having a handle 113 built in the case 112 for opening and closing the voltage pole contact portion 110 and having a trip link 114 responsive to the operation of the abnormal current detecting means 111. An opening / closing mechanism unit 115 that trips and opens the voltage electrode contact unit 110 by a trip operation of the 114.

[Problems to be solved by the invention]

However, this circuit breaker does not
When connecting by wiring such as 5 etc., it is necessary to connect the two electric wires 106 and 107 of the cable 105 at different distances between the load side of the single-pole circuit breaker 104 and the neutral pole terminal block 103. The wires 106 and 107 need to be cut into different lengths, and the length of the wires 106 and 107 becomes longer, so the workability is extremely poor because it takes a longer time to remove the jacket of the cable 105. Was. In addition, a space for mounting the neutral pole terminal block 103 is required, and a large distribution board is required.

Accordingly, an object of the present invention is to provide a circuit breaker that can incorporate a neutral pole without increasing the size.

[Means for solving the problem]

The circuit breaker according to claim 1 is a case, a pair of voltage electrode terminals and a pair of neutral electrode terminals provided in the case, and is built in the case and connected in series between the voltage electrode terminals. The abnormal current detecting means and the voltage electrode contact part, and a handle built in the case to open and close the voltage electrode contact part, and having a trip link that responds to the operation of the abnormal current detecting means. An opening / closing mechanism that trips and opens the voltage electrode contact portion by a tripping operation of a trip link; and a built-in case that is connected between the neutral electrode terminals and that is interlocked with the opening / closing operation of the voltage electrode contact portion. A neutral electrode contact part that opens and closes, and the neutral electrode contact part is a fixed contact, an operating spring having a movable contact that contacts the fixed contact, and an operating spring between the operating spring and the handle. Ke It is characterized in that the operating spring is pushed by the handle by movably guided off operation of the handle to the scan constituted by the interlocking member to be separable operations.

According to a second aspect of the present invention, in the circuit breaker according to the first aspect, the neutral pole contact portion is turned on before the voltage pole contact portion, and is separated from the voltage pole contact portion. The interlocking relationship is set as follows.

In the circuit breaker according to claim (3), in claim (1), the pair of voltage pole terminals are provided at both ends of the case, and the pair of neutral pole terminals is the same as the voltage pole terminal. They are arranged in a direction perpendicular to the mounting surface of the case.

According to a fourth aspect of the present invention, in the circuit breaker according to the third aspect, the pair of neutral electrode terminals is located on the mounting surface side of the case of the voltage electrode terminal.

[Action]

According to the circuit breaker of claim (1), when the handle is operated, the voltage electrode contact portion is opened / closed by the opening / closing mechanism portion, and when the abnormal current detecting means operates due to the abnormal current in the electric circuit, the trip link operates to trip. The opening / closing mechanism causes the voltage electrode contact to trip and open. On the other hand, the neutral pole contact part also opens and closes in conjunction with the opening and closing operation of the voltage contact part. As described above, since the neutral pole contact portion and the neutral pole terminal are provided in the same case as the voltage pole contact portion and the like, the conventional workability can be solved and efficient wiring work can be performed. In addition, since the neutral pole contact portion opens the operation spring with an interlocking member that interlocks with the off operation of the handle, the entire configuration can be simplified, so that the width of the case does not increase due to simplification of the structure, The overall size can be reduced. Furthermore, since the conventional neutral pole terminal block is not required, the distribution board can be downsized.

According to the circuit breaker of claim (2), the neutral pole contact section of claim (1) is closed before the voltage pole contact section and is separated from the voltage pole contact section after. Since the interlocking relationship is set so that the arc of the neutral pole contact portion does not occur due to the opening and closing of the neutral pole contact portion in addition to the operation of claim (1), the contact loss due to the arc of the neutral pole contact portion is prevented. Can be.

According to the circuit breaker of claim (3), the pair of voltage pole terminals of claim (1) are provided at both ends of the case, and the pair of neutral pole terminals are connected to the voltage pole terminal. Because it is arranged in a direction perpendicular to the mounting surface of the case,
In addition to the function of claim (1), it is not necessary to increase the width of the case.
The distribution board does not increase in size.

According to the circuit breaker of claim (4), in claim (3), the pair of neutral electrode terminals is located on the mounting surface side of the case of the voltage electrode terminal. In addition to the operation, it is not necessary to increase the thickness of the mounting surface of the case for insulation, so that the height of the circuit breaker can be kept low.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS. That is, this circuit breaker includes case 1
It has voltage pole terminals 2 and 3, abnormal current detection means 4, voltage pole contact 5, switching mechanism 6, neutral pole terminals 7 and 8, and neutral pole contact 9.

The case 1 forms an outer shell and has an opening on a side surface (the front surface in FIG. 1), and the opening is closed by a cover (not shown). Reference numeral 10 denotes a connection hole for connecting the case 1 of another circuit breaker.

The pair of voltage pole terminals 2 and 3 are provided on the case 1. In the embodiment, the voltage pole terminal 2 is on the load side and the voltage pole terminal 3 is on the power supply side, and is provided at both ends of the case 1 on the upper side, that is, at a position away from the mounting surface 11.

The abnormal current detecting means 4 and the voltage pole contact part 5 are built in the case 1 and connected in series between the voltage pole terminals 2 and 3. The abnormal current detecting means 4 has a bimetal 13 attached at one end to the frame 12 by welding or the like, and a fixed piece 15 for detecting a short circuit of the magnetic material attached to the bimetal 13.
The other end of the bimetal 13 on the operating side and the voltage terminal 3 are electrically connected by a flexible lead 16 having a braided wire as an embodiment. The voltage electrode contact part 5 includes a fixed contact 17 provided on the voltage electrode terminal 2 and a movable contact 19 provided on a movable contact 18 of the switching mechanism part 6. A flexible lead wire 37 connects the bimetal 13 and the movable contact 18 by spot welding or the like.

The opening / closing mechanism section 6 has a handle 20 built in the case 1 for driving the voltage pole contact section 5 to open and close, and has a trip link 21 responsive to the operation of the abnormal current detecting means 4 to pull the trip link 21. The trip operation of the voltage electrode contact portion 5 is performed by the disconnection operation. In the embodiment, the handle 20 is fixed to the fixed shaft 28.
The trip link 21 has a lock receiving portion 33 having a hole as an embodiment, and is attached to the operating side of the bimetal 13 by a leaf spring 34 '. The base end of the movable contact 18 is connected to the handle 20 by the connecting shaft 29, and the cradle 30 is supported by the case 1 by the fixed shaft 31, and the locking portion 32 at the tip is tripped and the locking receiving portion of the link 21. Lock to 33. A reversing spring 35 is interposed between the middle portion of the cradle 30 and the middle portion of the movable contact 18, and the locking portion 32 of the cradle 30 is tripped by the reversing spring 35 and locked on the locking receiving portion 33 of the link 21. Let
In addition, a spring force in the opening direction or the closing direction is applied to the movable contact 18 and the handle 20 according to the reversing operation. Reference numeral 43 denotes a projection for forced opening provided near the fixed shaft 31 of the cradle 30.

The pair of neutral electrode terminals 7 and 8 are provided on the case 1. In the embodiment, the voltage pole terminals 2 and 3 are provided on the mounting surface 11 side. Thus, the pair of voltage pole terminals 2 and 3 are
The pair of neutral electrode terminals 7 and 8 are arranged in a direction perpendicular to the mounting surface 11 of the case 1 with respect to the voltage electrode terminals 2 and 3 so that the width of the case 1 is increased. Since there is no need, even if a number of circuit breakers are juxtaposed on the distribution board, the distribution board does not become large. A pair of neutral pole terminals 7 and 8 are voltage pole terminals.
The case 1 is located on the mounting surface 11 side of the case 1
Since it is not necessary to increase the thickness of the mounting surface 11 for insulation, the height of the circuit breaker can be kept low.

The neutral pole contact part 9 is built in the case 1 and has a neutral pole terminal.
It is connected between 7 and 8, and opens and closes in conjunction with the opening and closing operation of the voltage electrode contact section 5. In the embodiment, the fixed contact 22 is provided at the inner end of the neutral terminal 7, the movable contact 23 is provided at the distal end of the operating spring 24, and the base end of the operating spring 24 is at the inner end of the neutral terminal 8. The movable contact 23 is always in contact with the fixed contact 22 by the spring force of the operation spring 24. And the handle of the operating spring 24
The interlocking member 26 is slidable in a direction substantially perpendicular to the mounting surface 11 by a guide groove 27 formed by a pair of protrusions 38 of the case 1 between the interlocking member operating portion 25 near the reset portion 34 of the case 20. 1 supported. Therefore, when the handle 20 is operated to the off position as shown in FIG.
When the handle 20 is pushed to the ON position as shown in FIG. 3, the movable contact 23 is opened by pushing the interlocking member 26 and pushing the operation spring 24 with the interlocking member 26. 23 contacts the fixed contact 22. In this case, the operating spring
The force of holding the handle 20 of the reversing spring 35 in the off position is set to be greater than the spring force of 24. Further, by setting the length of the interlocking member 26, the interlocking relation is such that the neutral pole contact portion 9 is closed before the voltage pole contact portion 5 and is separated after the voltage pole contact portion 5. Therefore, it is possible to prevent the occurrence of an arc due to the opening and closing of the neutral pole contact portion 9, and to prevent the contact loss of the neutral pole contact portion 9 due to the arc.

The operation of the circuit breaker will be described. That is,
FIG. 1 shows an off state and FIG. 3 shows an on state. Cradle
Reference numeral 30 denotes an abnormal current standby state in which the locking portion 32 is locked by the locking receiving portion 33. The spring receiving portion 39 of the cradle 30 is located on one of the action lines 41 connecting the connecting shaft 29 and the spring receiving portion 40 of the movable contact 18. In the off state, the spring receiving part 39 of the cradle 30 is the action line
Because it is on the left side of 41, the movable contact
18 and the handle 20 are driven to the off position side. In the ON state, since the action line 41 is on the right side of the spring receiving portion 39 of the cradle 30, the movable contact 18 and the handle 20 are driven to the ON position side, and the movable contact 17 comes into contact with the fixed contact 19 while applying contact pressure. Push connecting shaft 29 and handle 20 to case 1
To the edge of the handle hole. In the off state, the moving member operating section 25 of the handle 20 pushes down the interlocking member 26, so that the operating spring 20 of the neutral pole contact section 9 is pushed open and the movable contact 23 is separated from the fixed contact 22.

FIG. 4 shows a trip state due to an abnormal current. That is, when an overcurrent flows in the electric circuit in the ON state of FIG. 3, the bimetal 13 bends and the operating side moves away from the cradle 30, so that the trip link 21
The locking portion 32 of the cradle 30 is detached from the locking receiving portion 33 away from the cradle 30. Therefore, the cradle 30 rotates about the fixed shaft 28 by the spring force of the reversing spring 35, and the spring receiving portion 39 is
As a result, the reversing spring 35 is reversed, the movable contact 18 is opened, and the handle 20 is moved to the neutral position, and the trip state is established. During this time, the movable contact 18 is directly pushed in the opening direction by the forced opening projection 43 with the rotation of the cradle 30, so that the movable contact 19 is opened early. On the other hand, when a short-circuit current flows, the magnetic flux generated around the bimetal 13 by the current flowing through the bimetal 13 concentrates on the fixed piece 15, and the cradle 30 is used to instantly attract the trip link 21 to the fixed piece 15.
Is released, and the reversing spring 35 is reversed with the rotation of the cradle 30 in the same manner as described above, and the movable contact 18 trips and opens.

In this trip state, since the handle 20 is in the neutral position, the interlocking member 26 is not pushed by the handle 20, so that the neutral pole contact portion 9 does not perform the opening operation, but there is no problem because the voltage pole contact portion 5 operates.

The reset after the trip is performed by tilting the handle 20 from the neutral position in FIG. 4 to the off side in FIG. 1, whereby the reset portion 34 of the handle 20 locks the cradle 30.
32 is depressed, the locking portion 32 is locked to the locking receiving portion 33 of the trip link 21 that has already been restored, and the resetting is completed.

According to this embodiment, the neutral pole contact part 9 and the neutral pole terminals 7, 8 are provided in the same case 1 as the voltage pole contact part 5 and the like. Can be. In other words, it is not necessary to measure different lengths of the two wires of the cable during the wiring work in the distribution board, and the length of removing the jacket of the cable may be equal and short, so that the wiring work can be performed efficiently. You. In addition, since the neutral pole contact portion opens the operation spring with an interlocking member that interlocks with the off operation of the handle, the entire configuration can be simplified, so that the width of the case does not increase due to simplification of the structure, The overall size can be reduced. Furthermore, since the conventional terminal block for neutral electrode is not required, the distribution board can be downsized.
It leads to cost reduction.

In the above-described embodiment, the neutral pole contact portion 9 is kept closed at the time of a trip. However, in the case of a circuit breaker having a switching mechanism in which the handle 20 does not stop in the neutral position, the neutral pole contact portion is also separated. I do. Further, in the present invention, the interlocking means of the neutral pole contact portion is not limited to this embodiment.

[Effect of the Invention] In the circuit breaker of claim (1), the neutral pole contact portion and the neutral pole terminal are provided in the same case as the voltage pole contact portion and the like.
Efficiency in wiring work can be achieved by eliminating the conventional poor workability. In addition, since the neutral pole contact portion opens the operation spring with an interlocking member that interlocks with the off operation of the handle, the entire configuration can be simplified, so that the width of the case does not increase due to simplification of the structure, The overall size can be reduced. Furthermore, since the conventional neutral pole terminal block is not required, the distribution board can be downsized.

In the circuit breaker according to claim (2), the interlocking relation is set such that the neutral pole contact portion is turned on before the voltage pole contact portion, and is opened after the voltage pole contact portion. For,
In addition to the effect of claim (1), no arc is generated in the neutral pole contact portion due to opening and closing, so that contact damage due to the arc of the neutral pole contact portion can be prevented.

In the circuit breaker according to claim (3), the pair of voltage pole terminals are provided at both ends of the case, and the pair of neutral pole terminals are arranged with respect to the voltage pole terminals in a direction perpendicular to the mounting surface of the case. Therefore, in addition to the effect of claim (1), it is not necessary to increase the width of the case. Therefore, even if a large number of circuit breakers are juxtaposed on the distribution board, the distribution board does not increase in size.

According to the circuit breaker of claim (4), the pair of neutral electrode terminals of claim (3) is located on the mounting surface side of the case of the voltage electrode terminal. Since it is not necessary to increase the thickness of the mounting surface for insulation, the height of the circuit breaker can be kept low.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention in an off state with a cover removed, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a side view of an on state, FIG. FIG. 5 is a front view of the distribution board to which the conventional circuit breaker is applied in an open state, and FIG. 6 is a side view of the conventional circuit breaker in an on state with a cover removed. 1 ... Case, 2,3 ... Voltage terminal, 4 ... Abnormal current detection means, 5 ... Voltage contact, 6 ... Opening / closing mechanism, 7,8 ... Neutral terminal, 9 ... Neutral pole contact point, 20 ... handle, 21 ... trip link

Claims (4)

(57) [Claims] 1. A case, a pair of voltage electrode terminals and a pair of neutral electrode terminals provided in the case, and an abnormal current detection means built in the case and connected in series between the voltage electrode terminals. And a voltage electrode contact portion, a handle built in the case to open and close the voltage electrode contact portion, and a trip link responsive to the operation of the abnormal current detecting means, and tripping of the trip link. An opening / closing mechanism for trip-opening the voltage electrode contact portion by operation, and a neutral terminal incorporated in the case and connected between the neutral electrode terminals and opening / closing in conjunction with the opening / closing operation of the voltage electrode contact portion. A pole contact part, the neutral pole contact part, a fixed contact, an operation spring having a movable contact that comes into contact with the fixed contact, and a movable between the operation spring and the handle to the case. Circuit breaker, characterized in that is constituted by the inner to operate the spring is pushed by the handle by off operation of the handle and the interlocking member to separable operations. 2. The interlocking relationship is set such that the neutral pole contact portion is turned on before the voltage pole contact portion, and is opened after the voltage pole contact portion. The circuit breaker according to 1). 3. The pair of voltage electrode terminals are provided at both ends of the case, and the pair of neutral electrode terminals are arranged in a direction perpendicular to the mounting surface of the case with respect to the voltage electrode terminals. The circuit breaker according to claim (1). 4. The circuit breaker according to claim 3, wherein said pair of neutral pole terminals are located on said mounting surface side of said voltage pole terminal.