KR100730045B1 - Low voltage distributing board having uninterruptible automatic transfer switch - Google Patents

Abstract

A low voltage distributing board having an uninterruptible automatic transfer switch is provided to reduce the height by rotating the moving port using two link members. A fixing port part includes a first fixing port connected to a commercial power supply(11), a second fixing port connected to an emergency power supply and a load port connected to a load(14). A moving port part is connected to the load port electrically, and is electrically connected to the first fixing port or the second fixing port. A rotation arm is fixed to a port rotation axis to rotate the port rotation axis. A first link member and a second link member are connected to the rotation arm. A rotation link is connected to a link rotation arm and has a slot at the end. A control axis rotates the rotation link by rotation. A guide part includes a guide slot guiding the rotation of the control axis. A branch part is connected to a fixing axis, and rotates the control axis.

Description

Low Voltage Switchgear with Integrated Uninterruptible Switch {Low Voltage Distributing Board having Uninterruptible Automatic Transfer Switch}

1A and 1B are conceptual views illustrating a low voltage switchgear having an uninterruptible automatic transfer switch according to the present invention.

Figure 2 is a perspective view showing the automatic transfer switch of Figure 1a.

Figure 3 is a perspective view showing the automatic transfer switch of Figure 2 from another angle.

4 is an exploded perspective view showing a part of the configuration of the automatic transfer switch of FIG.

5 is a side view of the automatic transfer switch of FIG. 2 showing a state in which the first movable terminal and the first fixed terminal are electrically connected.

6 is a side view of the automatic transfer switch of FIG. 2 showing a state in which the second movable terminal and the second fixed terminal are electrically connected.

FIG. 7 is a plan view illustrating a portion of the neutral line movable terminal and the neutral line fixed terminal of the automatic transfer switch of FIG. 2.

8 is a partial cross-sectional view showing a link member of the automatic transfer switch of FIG.

9 is a side view illustrating a rotation control unit of the automatic transfer switch of FIG. 2.

10 to 13 is an operating state diagram showing the operation of the rotation control unit.

***** Explanation of symbols for main parts of drawing *****

1: Low Voltage Switchgear 10: Automatic Switch

100: movable terminal 110: terminal rotation shaft

120: movable terminal

810: first fixed terminal 820: second fixed terminal

830: load terminal

The present invention relates to a low-voltage switchgear, and more particularly, to a low-voltage switchgear having an uninterruptible automatic transfer switch for automatically switching to use an emergency power source from a commercial power source when a power failure occurs.

Low voltage switchgear means the automatic switching switch, instrument, and relay (relay) that automatically switch to use emergency power from commercial power when power failure occurs for operation or control of power plant, substation, etc. Say the device to put and manage.

The automatic transfer switch refers to a device for switching from a commercial power source supplied from KEPCO to an emergency power source for preliminarily supplying power in the event of a power failure in an emergency such as a natural disaster.

In case of power outage such as hospital, factory, research institute, broadcasting station, etc., it has a generator to generate emergency power to minimize the damage. It is used to switch to the power supply.

On the other hand, the automatic transfer switch is a fixed terminal composed of a commercial power terminal, an emergency power terminal and a load terminal, and a movable terminal that is electrically connected to a commercial power terminal or an emergency power terminal selectively in an electrically connected state with the load terminal. It consists of.

However, the conventional automatic transfer switch used in the low voltage switchgear has a separate rotary device for rotation from the commercial power supply terminal to the emergency power supply terminal and the emergency power supply terminal to the commercial power supply terminal. Complicated, there is a problem that can cause a malfunction if there is an error in any one rotary device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-voltage switchgear with a built-in automatic transfer switch with a simple configuration and low risk of malfunction in order to solve the above problems.

Another object of the present invention is to provide a low-voltage switchgear with a built-in automatic transfer switch that can be reduced in size and particularly small in size, with a simple configuration.

The present invention was created in order to achieve the object of the present invention as described above, the present invention is fixed to include a first fixed terminal connected to the commercial power source, a second fixed terminal connected to the emergency power source, a load terminal connected to the load A terminal portion; A movable terminal unit electrically connected to the load terminal and selectively connected to the first fixed terminal or the second fixed terminal by rotation about the terminal rotation shaft and electrically connected to the load terminal; a) a rotating arm fixedly coupled to the terminal rotating shaft to rotate the terminal rotating shaft by rotation, and b) a first link member and a second link member whose one end is rotatably coupled to the rotating arm, respectively; c) rotatably coupled with the link rotating shaft installed in parallel with the terminal rotating shaft, the other end of the first link member rotatably coupled, and the other end of the second link member facing the other end of the second link member relative to the link rotating shaft. A rotatable link rotatably coupled and formed with a slot at one end; d) a control shaft having one end inserted into a slot formed in the rotational link, the control shaft being rotatably coupled by a connecting member rotatably coupled with the fixed shaft to rotate within a predetermined angle range and rotating the rotational link by rotation; e) a guide portion having a guide slot for guiding rotation of the control shaft; f) Disclosed is a low-voltage switchgear having an automatic transfer switch, the switch portion being rotatably coupled with a fixed shaft and including a rotation control unit for rotating the control shaft.

Hereinafter, with reference to the accompanying drawings with respect to a low-voltage switchboard incorporating an automatic transfer switch according to the present invention will be described in detail.

As shown in FIG. 1A, the low voltage switchgear 1 according to the present invention includes an air circuit breaker 11 connected to a KEPCO power source, which is a commercial power source 11, and a generator 12 for emergency power generation when a power failure occurs. And, one end is connected to the load 14 and the other end is configured to include an automatic transfer switch 10 for automatically switching to any one of the emergency breaker 12, such as the air circuit breaker 13 and generator .

As shown in FIGS. 1A and 1B, the automatic transfer switch 10 may be configured in various ways. In particular, the automatic transfer switch may include a fixed terminal unit and a movable terminal unit 100 as illustrated in FIGS. 2 to 13. ) And a transfer part.

Meanwhile, the fixed terminal part, the movable terminal part 100 and the switching part are supported and installed in the main body frame 300, respectively, and the main frame 300, the fixed terminal part, the movable terminal part 100 and the switching part are stored in the casing although not shown. Is installed.

The fixed terminal part is fixed to the main body frame 300, the first fixed terminal 810, which is a commercial power terminal connected to the commercial power source 11, the second fixed terminal 820, which is an emergency power terminal connected to the emergency power source 12. And a load terminal 830 connected to the load.

The first fixed terminal 810 is composed of a fixed terminal connected to the side of the Korea Electric Power for supplying commercial power (11).

The second fixed terminal 820 is composed of a fixed terminal connected to the emergency power source 12, such as a small generator capable of continuously supplying power to the load when the commercial power source 11 is not supplied by a power failure.

Here, the positions of the first fixed terminal 810 and the second fixed terminal 820 may be interchanged.

The load terminal 830 is selectively connected to each of the first fixed terminal 810 or the second fixed terminal 820 by a switching unit, and is configured to supply power to loads of various electric / electronic devices.

In this case, the fixed terminal unit may be applied to two-wire, three-wire, four-wire (R, S, T, N, etc.) according to the type of commercial power source 11 to be connected, each of the first fixed terminal 810, the second fixed The number of terminals 820 and load terminals 830 may be configured to two to four depending on the wiring type.

On the other hand, the first fixed terminal 810 is connected to the first wiring 811 for the connection to the KEPCO power, and the second fixed terminal 820 is the second wiring 821 for the connection to the emergency power supply 12. ) And the load terminal 830 is connected to the third wiring 831 to connect with the load.

In this case, as shown in FIGS. 5 and 6, the load terminal 830 protrudes more than the first fixed terminal 810 and the second fixed terminal 820 to facilitate connection of the respective wirings 811, 821, and 831. It is formed to be.

Meanwhile, the movable terminal unit 100 is electrically connected to the load terminal 830 and selectively contacts the first fixed terminal 810 or the second fixed terminal 820 by rotation about the terminal rotation shaft 110 to electrically. It may be configured to be connected.

The movable terminal unit 100 includes a terminal rotating shaft 110 fixed to the main body frame 300 and one or more movable terminals 120 fixed to the terminal rotating shaft 110. That is, the number of the movable terminals 120 is determined according to the number of wires (two wires, three wires, four wires, etc.) of the power source to be connected.

The movable terminals 120 are fixedly coupled to the terminal rotation shaft 110 and rotated with the rotation of the terminal rotation shaft 110, respectively, and are installed on the support member 121, so that the first fixed terminals 810 and The first movable terminal 122a and the second movable terminal 122b and the first movable terminal 122a and the second movable terminal 122b electrically connected to each of the second fixed terminals 820 by contact. It is configured to include a connection terminal 123 electrically connected to the load terminal 830.

The support member 121 is a non-conductive member is used so as not to be energized from the first movable terminal (122a), the second movable terminal (122b), the connecting terminal 123, a plurality of terminals to facilitate coupling with the rotating shaft (110) It may be composed of three members.

In addition, each of the first movable terminal 122a and the second movable terminal 122b may be in contact with the support member 121 at a constant contact pressure with each of the first fixed terminal 810 and the second fixed terminal 820. Elastic members 124a and 124b are provided.

On the other hand, when the automatic transfer switch according to the present invention is used for four-wire wiring, the fixed terminal and the movable terminal of the neutral wire forming the neutral wire contact of the fixed terminal portion and the movable terminal portion 100 fall later than the fixed terminal and the movable terminal of the other phase and stick quickly There is a need. This is because in general, when the phase loads are not equal to each other, a serious difference in the voltage between phases during automatic switching may cause unnecessary current flow, which may cause a failure.

Therefore, when the fixed terminal unit and the movable terminal unit 100 are each composed of four movable terminals to form a four-wire type, the neutral movable terminal connected to the neutral wire among the four movable terminals has a distance from the neutral fixed terminal to the remaining movable terminals. It may be configured to be narrower than the distance to the fixed terminal corresponding to. In particular, the neutral conductor terminal may be formed to protrude more than the other movable terminal.

In addition, when the fixed terminal portion and the movable terminal portion 100 is composed of four movable terminals each to form a four-wire, the neutral fixed terminal connected to the neutral wire of the four fixed terminals as shown in Figure 7, the other fixed After the movable terminal portions corresponding to the terminals are separated, the protrusion 840 in contact with the side surface of the neutral conductor terminal may be further coupled such that the neutral conductor terminal is later separated from the neutral conductor terminal.

The transfer part is configured to selectively electrically connect the movable terminal part 100 to the first fixed terminal 810 or the second fixed terminal 820.

The transfer part is composed of the rotation arm 130, the first link member 410 and the second link member 420, the link member, the rotation link 430, the control shaft 231, the guide portion 220 and the rotation It is configured to include a control unit.

Rotating arm 130 is fixedly coupled to the terminal rotation shaft 110 to rotate the terminal rotation shaft 110 by rotation. The pivot arm 130 is formed with a first coupling hole 131 and a second coupling hole 132 to which the ends of the first link member 410 and the second link member 420 are rotatably coupled, respectively.

At this time, the first coupling hole 131 and the second coupling hole 132 formed in the rotational arm 130 are formed to have a predetermined shaft distance with the terminal rotation shaft 110, the shape of the rotational arm 130 has a variety of shapes 2, 5 and 6, as shown in the 'Y' shape may be formed.

The link member may be composed of one or two first link members 410 and two second link members 420, each of which rotates the pivot arm 130 by the rotation of the pivot link 430. 130 and the rotating link 430 is configured to connect.

At this time, the first link member 410 and the second link member 420 are rotatably coupled to each of the pivot arm 130 and the pivot link 430, and adjust the contact pressure between the movable terminal portion 100 and the fixed terminal portion. Length adjustment unit 440 that can be adjusted to each length so that it can be further installed.

As shown in FIG. 8, the length adjusting unit 440 combines two or more members having at least one male screw part 441 formed therein with a nut part 442 for adjusting the coupling length thereof. It can be configured to include.

On the other hand, at the ends of the first link member 410 and the second link member 420, the manufacturing error and the movable terminal part 100 may be formed in the form of slots 411 and 412 in consideration of contact pressures with the fixed terminal parts. have.

As shown in FIGS. 2, 5, and 6, the rotation link 430 is rotatably coupled to the link rotation shaft 431 installed in parallel with the terminal rotation shaft 110, and the other end of the first link member 410. The second link member 420 is rotatably coupled and the other end of the second link member 420 is rotatably coupled to face the other end of the second link member 420 based on the link rotation shaft 431, and a slot 432 is formed at one end thereof. do. The slot 432 formed in the rotation link 430 is formed to have a predetermined length to allow the control shaft 231 to move.

One end of the control shaft 231 is inserted into the slot 432 formed in the rotational link 430, and is rotatable by the connecting member 230 rotatably coupled with the fixed shaft 310 to rotate within a predetermined angle range. It is configured to rotate the rotary link 430 by the rotation.

The guide unit 220 is formed with a guide slot 221 for guiding the rotation of the control shaft 231, the rotation control unit is rotatably coupled to the fixed shaft 310 and is configured to rotate the control shaft 231. .

The fixed shaft 310 is installed in the guide portion 220 or the main body frame 300 in parallel with the terminal rotation shaft (110).

The guide unit 220 is fixed to the main frame 300, the guide slot 221 is formed in an arc shape having a predetermined angle around the fixed shaft 310, the control shaft 231 in the guide slot 221 The guide slot 221 is fitted to be movable along. That is, the guide part 220 is configured such that the control shaft 231 rotates within a predetermined angle range about the fixed shaft 310.

The rotation controller is configured such that the control shaft 231 is rotated about the fixed shaft 310, and various configurations such as a motor and an electronic configuration are possible.

The rotation control unit of the embodiment of the present invention, the connecting member 230, the pressing unit 280 for applying an elastic force to any one end (A, B) of the end of the guide slot 221 around the fixed shaft 310, The control shaft 231 includes a movement control unit for moving from one end of the guide slot 221 to the other end.

The pressing unit 280 is rotatably installed at one end thereof with the main frame 300, the other end thereof is connected to the control shaft 231, and a variable link 282 having a variable length thereof, and an elastic member pushing the control shaft 231. 281.

In this case, the elastic member 281 is a coil spring, and is coupled to the variable link 282 in a state where the variable link 282 is fitted. The variable link 282 is hinged to the main frame 300 so as to be smoothly rotated by the movement of the control shaft 231.

Although not shown in the rotation control unit, a lever for rotating the control shaft 231 may be separately installed so that the user can manually move the control shaft 231.

The moving control part includes a hooking link 240, a rotating link part and a rotating part 290 such that the control shaft 231 rotates from one end to the other end along the guide slot 221 around the fixed shaft 310. It is configured to include).

The hooking link 240 is rotatably coupled to the fixed shaft 310 and includes a pair of hooking protrusions 241a and 241b formed to catch the control shaft 231.

The rotating link unit rotates the hooking link 240 about the fixed shaft 310 to rotate the hooking link 240 so that the control shaft 231 caught on the hooking protrusions 241a and 241b rotates. A first support link 270 rotatably installed on the main frame 300, a second support link 260 rotatably coupled to the other end of the first support link 270, and a second support link 270. Pin guide slot 251 is formed is inserted into the other end of the link pin 261 is coupled to the other end of the hooking link 240 and the coupling shaft 320 is rotated with the hooking link 240 It is configured to include a cam link (250).

The first support link 270 is rotatably supported by the hinge member 271 fixed to the main frame 300.

On the other hand, the rotating part 290 is configured to rotate the first support link 270 around the hinge member 271, as shown, a coupling rod coupled between both ends of the first support link 270 291 and a driving device 292 for pushing the coupling rod 291 upward to allow the first support link 270 to rotate about the hinge member 271.

The driving unit 292 is configured to allow the coupling rod 291 to move linearly, in particular, a solenoid may be used as the driving unit 292. When the driving unit 292 is used as a solenoid, it may be operated by applying a momentary voltage, and the coupling rod 291 may be configured as part of the solenoid.

Referring to the operation of the automatic transfer switch according to the present invention having the configuration as described above in detail.

The automatic transfer switch according to the present invention is installed between the power supply and the load to supply power to the load. As described above, since the power source is composed of the commercial power source 11 and the emergency power source 12, the automatic transfer switch is installed between the power source and the load consisting of the commercial power source 11 and the emergency power source 12.

And the automatic transfer switch is a first fixed terminal (1) connected to the first movable terminal 122a and the commercial power source 11, as shown in Figure 5 and 9, so that the commercial power source 11 is usually supplied to the load. 810 remains in an electrically connected state (connected state). Of course, the second movable terminal 122b maintains a state in which it is electrically separated from the second fixed terminal 820 (open state).

As described above, the first movable terminal 122a maintains a connection state with the first fixed terminal 810, and the second movable terminal 122b maintains an open state with the second fixed terminal 820. ) Is located at one end (A position) of the guide slot 221, and is located at the top of the slot 432 of the rotary link 430.

On the other hand, when a power failure or the like occurs, the automatic transfer switch is operated by a separate control device (not shown) or by a user, and the first movable terminal 122a is opened with the first fixed terminal 810 and the second movable terminal 122b. ) Is changed to a connection state with the second fixed terminal 820, that is, the state shown in FIG. 6, and an operation process thereof will be described with reference to FIGS. 10 to 13.

First, as shown in FIGS. 10 and 11, the driving unit 292 of the rotation control unit pushes the coupling rod 291 connected to the first support link 270 upward. As the coupling rod 291 is pushed upward, the first support link 270 rotates about the hinge member 271, and the end of the first support link 270 is rotated by the first support link 270. The second support link 260 rotatably coupled by the link pin 262 is pushed upward.

Meanwhile, the link pin 261 coupled to the other end of the second support link 260 pushes the cam link 250, and the cam link 250 rotates around the fixed shaft 310 and the cam link 250. The hooking link 240 fixedly coupled to the cam link 250 by the rotation of the) also rotates around the fixed shaft 310.

When the hooking link 240 rotates about the fixed shaft 310, the hooking protrusion 241b of the hooking link 240 exerts a force on the control shaft 231, and the control shaft 231 is fixed. It rotates along the guide slot 221 about 310.

In addition, by the rotation of the control shaft 231, the elastic member 281 of the pressing unit 280 is contracted while applying an elastic force to the control shaft 231.

The control shaft 231 rotates along the guide slot 221 to move from the A position to the position shown in FIG. 11. When the control shaft 231 passes through the position as shown in FIG. 11, the control shaft 231 is rapidly moved to the B position by the elastic force applied to the control shaft 231 by the elastic member 281 of the pressing unit 280. .

At this time, the driving unit 292 stops the operation as soon as the control shaft 231 passes the position as shown in Figure 11, the coupling rod 291 is lowered to the lower side.

On the other hand, while the control shaft 231 rotates, the rotation link 430 also rotates around the link rotation shaft 431. The first link member 410 and the second link member 420 coupled to the link rotating shaft 431 are moved by the rotation of the rotation link 430, and the first link member 410 and the second link member are moved. The 420 rotates the combined pivot arm 130 to rotate the terminal rotation shaft 110.

As a result, as shown in FIGS. 6 and 12, the first movable terminal 122a is opened with the first fixed terminal 810 by the rotation of the terminal rotating shaft 110, and the second movable terminal 122b is opened. The connection state is changed to the second fixed terminal 820.

As a result, the control shaft 231 moves from the A position to the B position, and the first movable terminal 122a is opened with the first fixed terminal 810, as shown in FIGS. The movable terminal 122b is changed into a connection state with the second fixed terminal 820.

On the other hand, the automatic transfer switch according to the present invention is a state shown in FIG. 10 in the state shown in FIG. 12, the first movable terminal 122a is connected to the first fixed terminal 810, the second movable terminal 122b ) Will be described with reference to Figures 12 and 13 the process of changing to the open state with the second fixed terminal 820 as follows.

The first movable terminal 122a is connected to the first fixed terminal 810, and the second movable terminal 122b is changed to the open state with the second fixed terminal 820. By movement from position to position A by rotation.

First, as shown in FIG. 13, the driving unit 292 of the rotation control unit pushes the coupling rod 291 connected to the first support link 270 upward. As the coupling rod 291 is pushed upward, the first support link 270 rotates about the hinge member 271, and the end of the first support link 270 is rotated by the first support link 270. The second support linkage 260 rotatably coupled to the shaft is pushed upward.

Meanwhile, the link pin 261 coupled to the other end of the second support link 260 pushes the cam link 250, and the cam link 250 rotates around the fixed shaft 310 and the cam link 250. The hooking link 240 fixedly coupled to the cam link 250 by the rotation of the) also rotates around the fixed shaft 310.

When the hooking link 240 rotates about the fixed shaft 310, the hooking protrusion 241b of the hooking link 240 applies a force to the control shaft 231, and the control shaft 231 is a fixed shaft. It rotates along the guide slot 221 about 310.

In addition, by the rotation of the control shaft 231, the elastic member 281 of the pressing unit 280 is contracted while applying an elastic force to the control shaft 231.

The control shaft 231 rotates along the guide slot 221 to move from the B position to the position shown in FIG. 13. When the control shaft 231 passes through the position as shown in FIG. 13, the control shaft 231 is rapidly moved to the A position by the elastic force applied to the control shaft 231 by the elastic member 281 of the pressing unit 280. . At this time, the driving unit 292 stops its operation as soon as the control shaft 231 passes the position as shown in FIG. 13, and the coupling rod 291 is lowered downward.

On the other hand, while the control shaft 231 rotates, the rotation link 430 also rotates around the link rotation shaft 431. The first link member 410 and the second link member 420 coupled to the link rotating shaft 431 are moved by the rotation of the rotation link 430, and the first link member 410 and the second link member are moved. The 420 rotates the combined pivot arm 130 to rotate the terminal rotation shaft 110.

As a result, the control shaft 231 is moved from the B position to the A position, and the first movable terminal 122a is opened with the first fixed terminal 810, as shown in FIGS. The movable terminal 122b is changed into a connection state with the second fixed terminal 820.

The present invention has the advantage that it can provide a low-voltage switchgear with a simple structure and a built-in uninterruptible automatic transfer switch with a low risk of malfunction.

In addition, the present invention has the advantage that it is possible to provide a low-voltage switchgear with a built-in uninterruptible automatic transfer switch that can reduce the height by configuring to rotate the movable terminal using two link members.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

Claims (8)

A fixed terminal unit including a first fixed terminal connected to a commercial power source, a second fixed terminal connected to an emergency power source, and a load terminal connected to a load; A movable terminal part electrically connected to the load terminal and selectively contacted with the first fixed terminal or the second fixed terminal by rotation about a terminal rotation shaft to be electrically connected to the load terminal; a) a rotation arm fixedly coupled to the terminal rotation shaft to rotate the terminal rotation shaft by rotation, and b) a first link member and a second link member whose one end is rotatably coupled to the rotation arm, respectively; c) rotatably coupled with a link rotation shaft installed in parallel with the terminal rotation shaft, and the other end of the first link member is rotatably coupled, and the other end of the second link member is based on the link rotation shaft. A rotating link rotatably coupled to face the other end of the slot and having a slot formed at one end thereof; d) a control shaft, one end of which is inserted into the slot formed in the pivoting link, is rotatably coupled by a connecting member rotatably coupled to the fixed shaft to rotate within a predetermined angle range, thereby rotating the pivoting link by rotation; and; e) a guide portion having a guide slot for guiding rotation of the control shaft; f) a switch unit including a rotation control unit rotatably coupled to the fixed shaft and including a rotation control unit for rotating the control shaft. The method of claim 1, The rotation control unit A pressurizing part for applying an elastic force to the control shaft at any one end of the guide slot about the fixed shaft, and a movement control part for moving the control shaft from one end of the guide slot to the other end of the guide slot. Low voltage switchgear characterized in that. The method of claim 2, The movement control unit A hooking link rotatably coupled to the fixed shaft, and having a pair of hooking protrusions formed on the other end of the control shaft; A first support link, one end of which is rotatably installed with the main frame so as to rotate the hooking link such that the control shaft caught by the hooking protrusions rotates; A second support link whose one end is rotatably coupled with the other end of the first support link; A link pin coupled to the other end of the second support link; A pin link slot is formed to insert the link pin and is fixedly connected to the hooking link by a coupling shaft, and includes a rotation link unit including a cam link rotating together with the hooking link; Low voltage switchgear comprising a rotating part for rotating the first support link. The method of claim 3, wherein The rotating part And a driving device coupled to both ends of the first support link, and a driving device to push the coupling rod upwards to rotate the first support link. The method according to any one of claims 1 to 4, The fixed terminal portion and the movable terminal portion is composed of four movable terminals each to form a four-wire type, Low voltage switch panel, characterized in that the neutral movable terminal connected to the neutral of the four movable terminals is smaller than the distance between the fixed terminal fixed to the neutral terminal and the fixed terminal corresponding to the remaining movable terminal . The method of claim 5, Low voltage switchgear characterized in that the neutral wire movable terminal is formed to protrude more than the other movable terminal. The method according to any one of claims 1 to 4, The fixed terminal portion and the movable terminal portion is composed of four movable terminals to form a four-wire, respectively, The neutral wire fixed terminal connected to the neutral wire among the four fixed terminals has a side of the neutral wire movable terminal part so that the neutral wire movable terminal is later separated from the neutral wire fixed terminal after the movable terminal part corresponding to the other fixed terminals is separated. Low voltage switchgear characterized in that the protrusion further contacted with. The method according to any one of claims 1 to 4, The load terminal of the fixed terminal portion is characterized in that the low-voltage switchboard further protrudes outward than the first fixed terminal and the second fixed terminal.

Images