JP6656075B2 - Automatic power switching device - Google Patents

Description

  The present invention relates to an automatic power supply switching device that switches to a distributed power supply when a power failure occurs in a commercial power supply and continuously supplies power to a specific load.

When a power failure occurs, there is a distribution board that can reduce the occurrence of failure and damage due to the occurrence of a power failure by switching the power supply of a specific electric device such as an emergency light or a refrigerator from a commercial power supply to a distributed power supply such as a storage battery. For example, in Patent Literature 1, a switching switch that automatically performs a switching operation is installed on a distribution board, and when a power failure occurs, a power supply of a specific electric device is switched from a commercial power supply to a distributed power supply such as a storage battery, and the power supply is operated continuously. Have been.
On the other hand, there is a switch described in Patent Literature 2 that is manually operated to switch a power supply such as a load to one of two systems. It has a neutral position that is not connected to either.

JP 2016-39755 A JP 2015-210982 A

The switching switch mounted on the distribution board disclosed in Patent Document 1 has a structure dedicated to automatic switching, and is more expensive than a switching switch that switches manually. In addition, since there is no operation handle for manual switching, it is troublesome to switch to a distributed power source regardless of maintenance or the state of the power source.
Therefore, if automatic switching can be performed by connecting an adapter without significantly changing the conventional switching switch that is manually operated, automatic switching can be performed while making use of the manual switching function. Since there is no need to manufacture a new switching switch, costs can be suppressed.

  In view of such a problem, the present invention does not greatly change the structure capable of performing manual switching by using a conventional operation handle, and maintains the function of the manual operation while maintaining the function of the manual operation. It is an object of the present invention to provide an automatic power supply switching device capable of automatically switching to a distributed power supply such as the above.

In order to solve the above problems, the invention according to claim 1 is a switching opening / closing unit for switching a power supply of a load between a commercial power supply and a distributed power supply, a switching drive unit for driving the switching, and a power failure / recovery of the commercial power supply. And a control unit for controlling the switching drive unit by monitoring the power supply, switching the power supply of the load to the distributed power supply when a power failure occurs in the commercial power supply, and switching to the commercial power supply when the power is restored, the power supply automatic switching device, The opening and closing unit has an operation handle for manually switching the power supply, while the switching drive unit has a handle hook unit for engaging the operation handle and operating the operation handle to switch the power supply, Further, there is provided an angle detecting means for detecting an operation angle of the handle hook, and the control unit controls the operation handle based on angle information of the handle hook obtained from the angle detecting means.
According to this configuration, the operation angle of the controlled handle hook portion, that is, the tilt angle of the operation handle is detected and controlled, so that the control of switching by operating the operation handle can be reliably performed. On the other hand, since the switching opening / closing unit has an operation handle, manual operation is possible, and switching can be easily performed irrespective of power failure / recovery, which is convenient.
Further, since the operation is performed by engaging the handle hook portion with the operation handle, automatic switching can be performed without largely changing the conventional manual operation type switching switch, and automatic switching can be performed at low cost.

According to a second aspect of the present invention, in the configuration according to the first aspect, there is provided an engagement / disengagement detection unit configured to detect engagement / disengagement of the handle hook with the operation handle, and the control unit is configured to perform the operation based on information of the engagement / disengagement detection unit. When the handle hook is disengaged from the operating handle, the automatic switching control is stopped by moving the handle hook to a neutral position where the operating handle is off.
According to this configuration, when the handle hook is released, or when the handle hook is released, the handle hook moves to the operation handle off position, so that the mounting operation can always be performed with the switching opening / closing unit in the off state, and the mounting operation can be performed. Easy to do. Further, when the handle hook is disengaged from the operation handle, the control is stopped, so that a malfunction can be prevented.

According to a third aspect of the present invention, in the configuration according to the first or second aspect, the switching unit includes a first circuit connection terminal to which a commercial power supply is connected, a second circuit connection terminal to which a distributed power supply is connected, and a load. And the third circuit connection terminal are connected to each other, and the second circuit connection terminal and the third circuit connection terminal are copper bar terminals that enable connection of a plug-in type terminal of an earth leakage breaker or a branch breaker. It is characterized by the following.
According to this configuration, since the second circuit connection terminal and the third circuit connection terminal are copper bar type terminals, the primary circuit connection terminal can be directly connected to the plug-in type branch breaker to the third circuit connection terminal. A secondary-side connection terminal can directly connect a plug-in type earth leakage breaker to the two-circuit connection terminal. Therefore, there is no need for a distribution path from the switching opening / closing section to the branch breaker, nor is there a need for a distribution path from the earth leakage breaker to which the distributed power supply is connected to the switching opening / closing section, and a circuit for switching the power supply can be formed in a small space.

According to a fourth aspect of the present invention, in the configuration according to the third aspect, the switching opening / closing unit is assembled to a housing separable from the switching driving unit and the control unit, and an operation handle is provided on an upper surface of the housing and a first circuit connection is provided on a front surface side. The terminal, the second circuit connection terminal and the third circuit connection terminal are arranged on the back surface, and the switching drive unit and the control unit are assembled on the side of the housing.
According to this configuration, since the switching opening / closing section is formed by a dedicated housing, it can be used as a manual switching opening / closing switch when the switching driving section and the control section are removed, and the manual / automatic configuration change can be easily performed. it can.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the handle hook portion, the switching drive portion, and the control portion are integrally formed, and are detachably assembled to the housing.
According to this configuration, since the handle hook portion, the switching drive portion, and the control portion are integrally configured, the attachment / detachment from the housing can be easily performed, and the manual / automatic switching can be easily performed.

According to a sixth aspect of the present invention, in the configuration of the fourth or fifth aspect, the switching drive unit includes a motor, and the housing is formed with a concave portion that accommodates at least a part of the motor. .
According to this configuration, the motor having a depth can be accommodated in the housing of the switching switch. Therefore, even when the switching drive unit is assembled to the housing, there is no portion that protrudes greatly, and the assembly can be performed in a space-saving manner.

ADVANTAGE OF THE INVENTION According to this invention, in order to detect and control the operating angle of the controlled handle hook part, ie, the inclination angle of an operation handle, the control which operates an operation handle and performs switching can be implemented reliably. On the other hand, since the switching opening / closing unit has an operation handle, manual operation is possible, and switching can be easily performed irrespective of power failure / recovery, which is convenient.
Further, since the operation is performed by engaging the handle hook portion with the operation handle, automatic switching can be performed without largely changing the conventional manual operation type switching switch, and automatic switching can be performed at low cost.

It is a perspective explanatory view showing an example of an automatic power supply switching device concerning the present invention, and also shows a branch breaker. It is a perspective explanatory view of a power supply automatic switching device in which a housing constituting a switching opening and closing unit and a switching drive control unit are separated, and also shows a connected branch breaker and an earth leakage breaker. FIG. 2 is a perspective explanatory view showing a partially enlarged view of a main part with a partial cover of FIG. 1 removed. It is a top view of an automatic power supply switching device, and also shows the branch breaker and the earth leakage breaker. It is an internal circuit diagram of a switching opening and closing unit. It is a circuit block diagram of a switching drive control part. It is an AA line sectional view. It is BB sectional drawing. It is CC sectional drawing. It is a CC sectional view taken on the line in the state where the switching opening and closing part was connected to one side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show an example of an automatic power supply switching device according to the present invention, FIG. 1 is a perspective explanatory view, FIG. 2 is a perspective explanatory view in which a housing constituting a switching opening / closing section and a switching drive control section are separated, FIG. Is a perspective explanatory view showing an enlarged view of a main part with a cover partially removed, and FIG. 4 is a plan view. In each case, the connected branch breaker and earth leakage breaker are also shown. Reference numeral 1 denotes an automatic power supply switching device, reference numeral 2 denotes a branch breaker, and reference numeral 3 denotes an earth leakage breaker, showing a configuration for switching a single-phase three-wire circuit.

The automatic power supply switching device 1 includes a switching opening / closing section 4 and a switching driving control section 5, and the switching opening / closing section 4 has an operation handle 11 for switching operation disposed on an upper surface of a housing 10, and has a front (right side shown in FIG. 4). ), A first circuit connection terminal 12 (first voltage pole terminal 12a, neutral pole terminal 12b, second voltage) connected to one fixed contact 17A of a pair of fixed contacts 17 (17A, 17B) described later. The second circuit connection terminal 13 (first voltage pole terminal 13a, neutral pole terminal) connected to the other fixed contact 17B is provided on the rear surface of the housing 10 (left side in FIG. 4). 13b and a second voltage pole terminal 13c). Further, third circuit connection terminals 14 (first voltage pole terminal 14a, neutral pole terminal 14b, and second voltage pole terminal 14c) connected to a movable contact 15 described later are also arranged on the back surface. Reference numeral 6 denotes a terminal cover for protecting the terminals.
As described above, the switchgear 4 is constituted by one housing 10 and constitutes a switchgear which can be manually switched.

The first circuit connection terminal 12 is a screw type terminal for connecting and fixing a cable (not shown) with a screw 8 (shown in FIG. 7). The terminal 12a, the neutral pole terminal 12b, and the second voltage pole terminal 12c are arranged in this order.
On the other hand, the second and third circuit connection terminals 13 and 14 are arranged adjacent to a flat rising surface, and each terminal is formed of a horizontally long copper bar type terminal. In each case, three copper bar terminals are arranged side by side in the vertical direction, and neutral pole terminals 13b and 14b, first voltage pole terminals 13a and 14a, and second voltage pole terminals 13c and 14c are arranged from above. . In particular, the third circuit connection terminal 14 is formed wide so that a plurality of branch breakers 2 can be connected adjacently.

  The branch breaker 2 is schematically shown, and an operation lever for opening and closing and a secondary terminal are omitted. However, the primary side terminal 21 is a plug-in type terminal formed by providing a cutout in the lateral direction on the back surface of the branch breaker 2 as shown in FIG. 2, and a copper bar type terminal ( The third circuit connection terminal 14) is sandwiched and connected from above and below. The primary side terminal 21 has three terminals arranged vertically, a neutral pole terminal 21b, a first voltage pole terminal 21a, and a second voltage pole terminal 21c arranged from above. It is directly connected to the connection terminal 14.

  The earth leakage breaker 3 has substantially the same shape as the branch breaker 2, the operation lever 31 is arranged on the upper surface, the primary terminal 32 is arranged on the inclined front surface, and the secondary terminal 33 is arranged on the rear surface. I have. Both terminals are vertically arranged in triplicate, and the primary terminal 32 is formed as a quick connection terminal. On the other hand, the secondary terminal 33 is a plug-in type terminal formed by providing a cutout in the lateral direction similarly to the primary terminal 21 of the branch breaker 2, and includes a neutral terminal 33b and a first voltage extreme. The terminal 33 a and the second voltage pole terminal 33 c are arranged in this order, and are directly connected to the second circuit connection terminal 13 of the switching unit 4. Reference numeral 9 denotes a cable of a distributed power supply circuit such as a storage battery.

  As described above, since the second circuit connection terminal 13 and the third circuit connection terminal 14 are copper bar terminals, the primary circuit connection terminal can be directly connected to the plug-in type branch breaker 2 to the third circuit connection terminal 14. The secondary side connection terminal can directly connect the plug-in type earth leakage breaker 3 to the second circuit connection terminal 13. Therefore, a power distribution path from the switching opening / closing section 4 to the branch breaker 2 is not required, and a power distribution path from the earth leakage breaker 3 to which the distributed power supply is connected to the switching opening / closing section 4 is not required, and a circuit for switching the power supply is formed in a small space. it can.

  FIG. 5 is a circuit diagram of the switching switch 4, that is, an internal circuit diagram of the housing 10 constituting the switching switch. As shown in FIG. 5, each of the connection terminals 12 (12a to 12c), 13 (13a to 13c), and 14 (14a to 14c) is configured in triplicate. The third circuit connection terminal 14 performs switching connection between the first circuit connection terminal 12 and the second circuit connection terminal 13 by operating the operation handle 11, and has three postures including a neutral open state where no connection is made. It is selectable.

  Specifically, when the automatic power supply switching device 1 is used in a circuit for switching a power supply from a commercial power supply to a storage battery power supply circuit having a storage battery as a distributed power supply in the event of a power failure, a branch breaker (specific branch) is connected to the third circuit connection terminal 14. A circuit to which an electric device (specific load) is connected is connected via a (breaker) 2, a first circuit connection terminal 12 is connected to a commercial power supply circuit connected to a commercial power supply, and a second circuit connection terminal 13 is connected to an earth leakage breaker. The storage battery power supply circuit (distributed power supply system circuit) is connected via 3 and the power supply is switched when a power failure of the commercial power supply is detected as described later.

The switching drive control unit 5 includes a switching driving unit 50 including a handle hook 52, a motor 53, and a transmission mechanism 54 for transmitting rotation of the motor 53 to the handle hook 52, on a metal plate-shaped base 51, A circuit accommodating section 55 accommodating a control circuit (control section) for controlling the switching by controlling the 53, an engagement / disengagement sensor 57 for detecting an engagement / disengagement state of the handle hook section 52 with the operation handle 11, and a handle hook are further provided. Three photointerrupters 58 for detecting the operation angle of the unit 52 are assembled to the base 51 via fixing pieces 51a.
The base 51 is fixed to the housing 10 by screws and the switching drive control unit is integrated with the switching opening / closing unit 4. Further, the switching drive control unit 5 fixed to the housing 10 is covered with a cover frame 56 similarly fixed to the housing 10 by screws.
As described above, since the handle hook portion 52, the switching drive portion 50, and the circuit housing portion 55 are integrally configured, the attachment / detachment from the housing 10 can be easily performed, and the manual / automatic configuration change can be easily performed. it can.

  The handle hook portion 52 is formed in a lid shape that covers the entire operation handle 11, and an end located on a side portion side of the operation handle 11 is pivotally attached to a rotating piece 54 b of the transmission mechanism 54. The handle hook portion 52 can be tilted / raised in the left-right direction of the housing 10 about the shaft attachment portion, and is configured to be detachable from the operation handle 11. FIG. 1 shows a state in which the handle hook portion 52 is tilted halfway. When the handle hook portion 52 is tilted until it becomes horizontal in the direction indicated by the arrow P1, the operation handle 11 is covered as shown in FIG. To engage with the operation handle 11.

Further, a gear 54a constituting the transmission mechanism 54 is provided on the rotating piece 54b on which the handle hook 52 is pivotally mounted, and the gear 54a rotates through a gear 54c which is rotated by driving of the motor 53. Then, the handle hook 52 rotates in the front-rear direction of the case 10. Thus, the operation handle 11 is tilted forward or backward.
The motor 53 is mounted on the base 51 so as to protrude in the direction of the housing 10 to be mounted. A cylindrical concave portion 10a is formed in a portion of the housing 10 corresponding to the position of the motor 53. 53 projecting portions can be stored.

As described above, since the motor 53 having a depth can be accommodated in the housing 10 of the switching opening / closing unit 4, even if the switching drive control unit 5 is assembled to the housing 10, the switching driving control unit 5 can be configured without a large projecting portion, and can be assembled in a space-saving manner.
As shown in the enlarged view of FIG. 3, an engagement piece 59 that is engaged with the photo interrupter 58 to recognize the rotation angle of the rotation piece 57b is attached to the rotation piece 54b.

  FIG. 6 is a circuit block diagram of the switching drive control unit 5. As shown in FIG. 6, a control circuit 61 for controlling the motor 53, a power supply circuit 62 for supplying power to the control circuit 61 and the motor 53, a commercial power supply voltage sensor 63 for detecting the presence or absence of a commercial power supply, and detecting the presence or absence of a storage battery power supply And a circuit open / close switch 65 composed of a semiconductor switch for opening and closing the storage battery power supply. Note that a control circuit 61 and a power supply circuit 62 are housed in the circuit housing section 55.

The power supply circuit 62 is connected to both the commercial power supply circuit and the storage battery power supply circuit, and the control circuit 61 operates to open the circuit open / close switch 65 to connect the power supply circuit 61 to the commercial power supply circuit as long as the commercial power supply is energized. When the commercial power supply voltage sensor 63 detects a power failure, the circuit open / close switch 65 is closed to connect the storage battery power supply circuit to the power supply circuit 62. Then, when the restoration of the commercial power supply is detected, the circuit open / close switch 65 is opened.
When the storage battery power supply voltage sensor 64 does not detect a voltage, the power supply is not switched even if a power failure occurs, and the circuit open / close switch 65 is opened.

7 to 10 are cross-sectional views of the housing 10 cut at different portions. Hereinafter, the internal structure of the housing 10 and the operation of the switching unit 4 will be described with reference to the drawings. FIG. 7 is a cross-sectional view taken along the line AA of FIG. 3, and shows an internal connection structure of the three first voltage pole terminals 12a, 13a, and 14a. As shown in FIG. 7, a movable contact 16 a having movable contacts 15 on both front and rear sides is disposed in the housing 10 so as to hang below the operation handle 11, and a pair of fixed contacts 17 (17 Aa, 17 Aa, 17Ba) is disposed.
The movable contact 15 is connected to the first voltage pole terminal 14a of the third circuit connection terminal 14 via the movable contact 16a and the flexible conductor 18 connected to the movable contact 16a. One fixed contact 17Aa disposed in the front is connected to the first voltage pole terminal 12a of the first circuit connection terminal 12 via the copper bar 7a, and the other fixed contact 17Ba disposed in the rear is connected via the copper bar 7b. Connected to the first voltage pole terminal 13a (shown in FIG. 2) of the second circuit connection terminal 13.

FIG. 8 is a sectional view taken along the line BB, and shows the internal connection structure of the three neutral pole terminals 12b, 13b, and 14b. As shown in FIG. 8, a movable contact 16b having movable contacts 15 on both front and rear sides is disposed so as to hang below the operation handle 11, and a pair of fixed contacts 17 (17Ab, 17Bb) are disposed before and after the movable contact 16b. ing.
The movable contact 15 is connected to the neutral pole terminal 14b of the third circuit connection terminal 14 via the movable contact 16b and the flexible conductor 18, as in the structure of the first voltage pole described above. One fixed contact 17Ab arranged in the front is connected to the neutral pole terminal 12b of the first circuit connection terminal 12 via the copper bar 7a, and the other fixed contact 17Bb arranged in the rear is connected via the copper bar 7b. The second circuit connection terminal 13 is connected to a neutral pole terminal 13b (shown in FIG. 2).

FIG. 9 is a cross-sectional view taken along the line CC, and shows the internal connection structure of the three second voltage pole terminals 12c, 13c, and 14c. As shown in FIG. 9, a movable contact 16c having movable contacts 15 on both front and rear sides is disposed so as to hang below the operation handle 11, and a pair of fixed contacts 17 (17Ac, 17Bc) are disposed before and after the movable contact 16c. ing.
The movable contact 15 is connected to the second voltage pole terminal 14c of the third circuit connection terminal 14 via the movable contact 16c and the flexible conductor 18, as in the terminal structure of the first voltage pole described above. Further, one fixed contact 17Ac disposed in the front is connected to the second voltage pole terminal 12c of the first circuit connection terminal 12 via the copper bar 7a, and the other fixed contact 17Bc disposed in the rear is connected to the copper bar 7b. Is connected to the second voltage pole terminal 13c (shown in FIG. 2) of the second circuit connection terminal 13 via the.

The switching opening / closing section 4 configured as described above is switched as follows. The movable contact 16 is configured to rotate back and forth by operating the operation handle 11, and tilts the operation handle 11 forward, that is, the handle hook 52 rotates forward to tilt the operation handle 11 forward. Then, the movable contact 16 also rotates forward. When the operating handle 11 is tilted backward, that is, when the handle hook portion 52 is rotated backward and the operating handle 11 is tilted rearward, the movable contact 16 also rotates rearward. Thus, the movable contact 15 is selectively connected to one fixed contact 17.
For example, when the operation handle 11 is tilted to the right (forward) shown in FIG. 4, the movable contact 5 contacts the front fixed contact 17A to connect the first circuit connection terminal 12 and the third circuit connection terminal 14. Is done. FIG. 10 is a cross-sectional view taken along line CC in this connection state, that is, a state in which the operation handle 11 is tilted forward.

The control circuit 61 controls the motor 53 to operate the operation handle 11 with respect to the switching opening / closing unit 4 configured as described above, and performs a power supply switching operation. Specifically, as long as the commercial power supply circuit is energized, that is, as long as there is commercial power supply, the third circuit connection terminal 14 of the switching unit 4 is connected to the first circuit connection terminal 12. The terminal 14 is connected to the second circuit connection terminal 13. Thereafter, when the restoration of the commercial power supply is detected, the connection is returned to the first circuit connection terminal 12.
In this control, whether the connection with the commercial power supply circuit, the connection with the storage battery system circuit, or the neutral state in which no circuit is connected is determined by receiving signals from the three photointerrupters 58. Judgment is made.

  Further, the control circuit 61 determines from the signal of the engagement / disengagement sensor 57 whether the handle hook 52 has been disengaged from the operation handle 11 or has been disengaged from the operation handle due to the upright operation. The control is stopped by returning the handle hook 52 to the neutral position.

As described above, since the operation angle of the controlled handle hook portion 52, that is, the tilt angle of the operation handle 11 is detected and controlled, the control of operating the operation handle 11 to perform switching can be reliably performed. On the other hand, since the switching opening / closing section 4 has the operation handle 11, the switching operation can be performed manually, and the switching can be easily performed irrespective of a power failure / power recovery, which is convenient.
In addition, since the operation is performed by engaging the handle hook portion 52 with the operation handle 11, automatic switching can be performed without largely changing a conventional manually operated switching switch, and automatic switching can be performed at low cost. .
Further, if the handle hook 52 is removed or the handle hook 52 is removed, the handle hook 52 moves to the off position of the operation handle 11, so that the mounting operation to the operation handle 11 must be performed by the switching opening / closing section 4 without fail. It can be carried out in the off state and the mounting operation is easy. Further, since the control is stopped when the handle hook portion 52 comes off the operation handle 11, malfunction can be prevented.
In addition, since the switching opening / closing section 4 is formed of a dedicated housing, the switching opening / closing section 4 can be used as a manual switching opening / closing switch when the switching drive control section 5 in which the switching drive section 50 and the circuit housing section 55 are assembled is removed. / Manual switching device can be manufactured at low cost.

In the above-described embodiment, the voltage sensors 63 and 64 are provided in both the commercial power supply circuit and the storage battery power supply circuit. However, the storage battery power supply voltage sensor 64 may not be provided, and the detection of the power failure / recovery of the commercial power supply is sufficient. Control is possible.
Further, although the switching of the single-phase three-wire circuit has been described, the automatic power supply switching device 1 can be applied to the switching of the three-phase three-wire circuit.
Furthermore, the distributed power source has been described as a storage battery, but may be a fuel cell or the like.

  1. Automatic power switching device 2. Branch circuit breaker 3. Earth leakage breaker 4. Switching opening / closing unit 5. Switching drive control unit 10. Housing 10a recessed part 11. Operation handle , 12 first circuit connection terminal, 13 second circuit connection terminal, 14 third circuit connection terminal, 15 movable contacts, 16 movable contacts, 17 fixed contacts, 21 Primary terminal, 33 ··· Secondary terminal, 50 ··· Switching drive, 51 ··· Base, 52 ·· Handle hook, 53 ·· Motor, 54 ··· Transmission mechanism, 55 ··· Circuit housing , 57... Disengagement sensor (engagement detection means), 58... Photointerrupter (angle detection means) 61... Control circuit (control section).

Claims (6)

A switching switch for switching the power supply of the load between the commercial power supply and the distributed power supply, a switching drive unit for driving the switching, and a control unit for monitoring the power failure / recovery of the commercial power supply and controlling the switching drive unit. A power supply automatic switching device that switches a power supply of the load to a distributed power supply when a power failure occurs in a commercial power supply, and switches to a commercial power supply when the power is restored,
The switching opening and closing unit has an operation handle for manually switching a power supply,
The switching drive unit has a handle hook that engages with the operation handle and operates the operation handle to switch power.
Further, an angle detecting means for detecting an operating angle of the handle hook portion,
The automatic power supply switching device, wherein the control unit controls the operation handle based on angle information of the handle hook obtained from the angle detection unit. An engagement / disengagement detection unit configured to detect engagement / disengagement of the handle hook with the operation handle,
The control unit, based on the information of the engagement / disengagement detection means, stops the automatic switching control by moving the handle hook to a neutral position, which is an operation handle off position, when the handle hook is disengaged from the operation handle. The automatic power supply switching device according to claim 1, wherein: The switching switch has a first circuit connection terminal to which a commercial power supply is connected, a second circuit connection terminal to which a distributed power supply is connected, and a third circuit connection terminal to which a load is connected.
The said 2nd circuit connection terminal and the said 3rd circuit connection terminal are the copper bar type terminals which enable connection of the plug-in type terminal of an earth leakage breaker or a branch breaker, The claim 1 or 2 characterized by the above-mentioned. Automatic power switching device. The switching opening and closing unit is assembled to a housing that can be separated from the switching driving unit and the control unit,
The operation handle is disposed on an upper surface of the housing, the first circuit connection terminal is disposed on a front side, and the second circuit connection terminal and a third circuit connection terminal are disposed on a rear surface,
4. The automatic power supply switching device according to claim 3, wherein the switching drive unit and the control unit are assembled to a side of the housing.   5. The automatic power supply switching device according to claim 4, wherein the handle hook, the switching drive, and the controller are integrally formed and removably assembled to the housing.   6. The automatic power supply switching device according to claim 4, wherein the switching drive unit includes a motor, and the housing has a concave portion that accommodates at least a part of the motor.

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