JP2001101544A - Overcurrent alarm device and cabinet panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overcurrent alarm device which can properly alarm by preventing the misoperation of a change-over switch which switches the mode of the device between a limiter mode and a limiterless mode. SOLUTION: This overcurrent alarm device detects the currents flowing through the power lines of single-phase three-wire wiring having a plurality of power lines and a neutral line. A change-over switch 73 attached to the attaching surface 71 of the main body 61 of the alarm device switches the mode of the alarm device between a limiter mode in which the vector sum of the currents detected from both power lines is used as a used current value and a limiterless mode in which the larger one of the currents detected from the power lines is used as the used current value. Alarm means 68 and 69 alarm when the used current value in the mode set by the switch 73 reaches a preset value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent alarm device for alarming an overcurrent and a distribution board using the overcurrent alarm device.

[0002]

2. Description of the Related Art Conventionally, in the case of a single-phase three-wire system having a plurality of power supply lines (voltage lines) and neutral lines, a main breaker and a main breaker are provided in the main body of the distribution board. A plurality of branch breakers connected to each power line and neutral line on the secondary side of the main breaker are provided, and a limiter as a current limiter connected to the primary side of the main breaker, An overcurrent alarm device or the like connected to the primary side or the secondary side of the breaker is provided.

[0003] The overcurrent alarm device is configured to notify the user of excessive use of electricity by lighting a lamp or an LED or by displaying a sound such as a sound announcement or a warning sound when the amount of electricity exceeds a set frame. ing. In the overcurrent alarm device, the current flowing through each power line is detected, and if a limiter is provided, a vector sum of currents (voltage phases) detected from both power lines is used as a current value. In this case, the larger of the currents (voltage phases) detected from the respective power supply lines is used as the used current value, and an alarm is issued when the detected used current value reaches a preset current value. .

For this reason, the overcurrent alarm device needs to be compatible with the case with the limiter and the case without the limiter. Two types of devices are provided, one with the limiter only and one without the limiter, or a mode with the limiter. And a limiter-less mode. In a dual-type overcurrent alarm device equipped with a changeover switch, the changeover switch is arranged on the upper surface of the overcurrent alarm device main body and is arranged in a protruding state (exposed state) for easy operation. Cover the changeover switch.

[0005]

However, in the case of an overcurrent alarm device provided with two types, one for exclusive use with a limiter and one for exclusive use without a limiter, product management and inventory management become troublesome, and the types of nameplates and boxes increase. There is a problem that costs are high.

In the case of a dual-type overcurrent alarm device having a changeover switch, if the cover for covering the changeover switch is forgotten to be attached or the cover is removed, the changeover switch is exposed and can be easily operated. Therefore, there is a possibility that a switchboard operator or a user may erroneously perform the switching operation, and if the setting of the mode with limiter and the mode without limiter by the changeover switch are reversed, it is impossible to correctly issue an alarm.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an overcurrent alarm device capable of preventing an erroneous operation of a changeover switch for switching between a mode with a limiter and a mode without a limiter and capable of correctly alarming, and this overcurrent alarm device It is an object of the present invention to provide a distribution board using the same.

[0008]

According to a first aspect of the present invention, there is provided an overcurrent alarm apparatus comprising: an overcurrent alarm apparatus body having a mounting surface on a back surface; and a single-phase three-wire wiring having a plurality of power lines and a neutral line. A current detecting means for detecting a current flowing through each power supply line; a mode with a limiter provided on the mounting surface side of the overcurrent alarm device main body and using a vector sum of currents detected from both power supply lines as a used current value; A changeover switch for switching to a limiterless mode in which the larger of the currents detected from the power supply line is used as a use current value; when the use current value in the mode set by the changeover switch reaches the set current value Alarm means for alarming the user.

Further, since the changeover switch for switching between the mode with limiter and the mode without limiter is provided on the mounting surface side of the overcurrent alarm device main body, after the mode is set by the changeover switch, it is passed through the mounting surface of the overcurrent alarm device main body. By mounting the switch on a distribution board or the like, the switch is concealed, erroneous operation of the switch is prevented, and a correct alarm is issued.

According to a second aspect of the present invention, there is provided an overcurrent alarm device including an overcurrent alarm device having a window hole on a side surface thereof; A current detecting means for detecting a current; a mode provided with a limiter provided at an inner position facing a window of the overcurrent alarm device main body and using a vector sum of currents detected from both power supply lines as a used current value; A changeover switch for switching to a limiterless mode in which the larger of the currents detected from the limiter is used as a use current value; an alarm is issued when the use current value in the mode set by the changeover switch reaches the set current value Alarm means for performing the following.

Since the switch for switching between the mode with limiter and the mode without limiter is provided at an inner position facing the window on the side of the overcurrent alarm device body, the switch is concealed and cannot be easily operated. , To prevent erroneous operation of the changeover switch and to give an alarm correctly.

According to a third aspect of the present invention, there is provided an overcurrent alarm apparatus according to the second aspect, wherein a lid for closing a window is detachably provided.

Since the lid for closing the window is detachably provided, the changeover switch is securely hidden.

According to a fourth aspect of the present invention, there is provided an overcurrent alarm apparatus according to the second or third aspect, further comprising an operation unit detachably mounted on the changeover switch and disposed in the window. It is.

[0015] Since the operating portion is provided in the window hole so as to be detachably attached to the changeover switch, the changeover switch can be easily operated as required.

According to a fifth aspect of the present invention, there is provided a distribution board comprising: a distribution board body;
A main breaker provided in the distribution board main body and connected to a single-phase three-wire wiring having a plurality of power supply lines and neutral wires; and a power supply line provided in the distribution board main body and extending from the main breaker. 5. A plurality of branch breakers connected to a neutral line; and an overcurrent alarm device according to any one of claims 1 to 4, which is provided in the switchboard main body, and wherein a changeover switch is set to a limiterless mode. Is what it is.

The overcurrent alarm device according to any one of claims 1 to 4, wherein the switchboard body, the main breaker, the plurality of branch breakers, and the changeover switch are set to a limiterless mode. When an alarm occurs, an overcurrent alarm device can be used to properly issue an alarm.

According to a sixth aspect of the present invention, there is provided a distribution board comprising: a distribution board body;
A main breaker provided in the distribution board main body and connected to a single-phase three-wire wiring having a plurality of power lines and neutral wires; and a main breaker provided in the distribution board main body and connected to a primary side of the main breaker. A plurality of branch breakers provided in the main body of the distribution board and connected to the respective power lines and neutral wires on the secondary side of the main breaker; and a limiter provided in the main body of the distribution board, And an overcurrent alarm device according to any one of claims 1 to 4, which is set to an attached mode.

The overcurrent alarm device according to any one of claims 1 to 4, wherein the switchboard main body, the limiter, the main breaker, the plurality of branch breakers, and the changeover switch are set to a mode with a limiter. When an overcurrent occurs, a correct alarm can be made by an overcurrent alarm device.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show one embodiment of an overcurrent alarm device, FIGS. 3 to 7 show other embodiments of the overcurrent alarm device, and FIG. 8 shows the overcurrent alarm of each embodiment. 1 shows a configuration diagram of a distribution board to which an alarm device can be applied in common.

First, the configuration of the distribution board will be described with reference to FIG.

Reference numeral 11 denotes a main body of the distribution board.
The power distribution panel main body 11 is provided with a distribution panel unit 12 that is configured in a box shape having a base installed on a wall surface or the like and a cover detachably attached to the front surface of the base.

The distribution board unit 12 corresponds to a single-phase three-wire system having a plurality (a pair) of power lines (voltage lines) and a neutral line, and includes a limiter 21 as a current limiter and a main breaker 22. , A plurality of branch breakers 23, a pair of power line terminals 2
4. It has a neutral terminal 25, an overcurrent alarm device 26, and the like, which are mounted on a device mounting plate 27, and are disposed in the distribution board main body 11 via the device mounting plate 27.

The equipment mounting plate 27 is made of, for example, metal, and the limiter 21 and the main breaker are located on the left side of the equipment mounting plate 27.
A plurality of branch breakers 23 are arranged at right and left positions of the device mounting plate 27 in two vertical stages, each of which is arranged side by side in the left-right direction. A power supply terminal 24 and a neutral terminal 25 are provided, and an overcurrent alarm device 26 is provided in parallel with the lower branch breaker 23.

The limiter 21 limits the overall current flowing from the distribution board. The limiter 21 has an operation lever 31 on the front surface for switching between disconnection and connection. A power supply line (not shown) that is drawn in is connected to supply 200 V commercial power, and a lower connection portion on the secondary side is provided.
33 is connected to a wiring 34 connected to the main breaker 22. The wiring 34 is a single-phase three-wire wiring having a pair of power supply lines (voltage lines) 35 and a neutral line 36.

The main breaker 22 has an operation lever 39 for switching between disconnection and connection on the front surface, and an upper connection portion on the primary side.
The wiring 34 from the limiter 21 is connected to 40, and the wiring 34 connected to the power line terminal (voltage line terminal) 24 and the neutral line terminal 25 is connected to the lower connection part 41 on the secondary side. . This wiring 34 is a single-phase 3 having a pair of power supply line 35 and neutral line 36.
It is a wire type wiring.

The branch breaker 23 has an operation lever 44 for switching between disconnection and connection on the front side, and one of the connection portions (not shown) below each of the upper branch breakers 23 is connected to one of the power line terminal 24 and the neutral line terminal. 25, and one of the connection portions (not shown) on the upper side of each of the lower branch breakers 23 is connected to the other power supply line terminal 24 and the neutral line terminal 25, respectively, and the other connection of each of the upper and lower branch breakers 23 is performed. The unit 45 is connected to a load wiring connected to a load.

The power supply line terminal 24 is connected to a power supply line 35 of a wiring 34 from the main breaker 22, and the neutral terminal 25 is connected to a neutral line 36 of the wiring 34 from the main breaker 22. A cover 48 is provided so as to cover one connection portion of the branch breaker 23 together with the power supply terminal 24 and the neutral terminal 25.

The overcurrent alarm device 26 is provided with a lamp or LED when the amount of electricity used exceeds a set limit.
And a sound display such as a sound announcement or an alarm sound, and a pair of current detection means for detecting a current flowing through a pair of power supply lines 35 of the secondary wiring 34 of the main breaker 22. It has a current transformer 51, and each pair of detection lines 52 from each current transformer 51 is connected to the overcurrent alarm device 26.

Next, an embodiment of the overcurrent alarm device 26 will be described with reference to FIGS.

FIG. 1A is a perspective view of the overcurrent alarm device as viewed from the front side, FIG. 1B is a perspective view of the overcurrent alarm device as viewed from the back side, and FIG. It is a perspective view of a state.

The overcurrent alarm device 26 is a main body of the overcurrent alarm device.
The overcurrent alarm device main body 61 includes a base 62 and a cover 63.

The base 62 has a connecting portion 64 protruding from the cover 63. The connecting portion 64 is connected to a plurality of connection terminals 65 to which a pair of detection wires 52 from each current transformer 51 are connected.
A plurality of connection screws 66 for tightening and loosening each connection terminal 65 are provided.

On the front of the cover 63, a set current changeover switch 67 for setting and operating a current value to be alarmed, a plurality of display sections 68 such as light emitting diodes (LEDs) as alarm means and a speaker 69, and the volume of the speaker 69 are displayed. A volume changeover switch 70 for switching is provided.

The back surface of the base 62 of the overcurrent alarm device main body 61 is formed as a mounting surface 71 to the equipment mounting plate 27, and the mounting surface 71 is formed with a horizontally long window-shaped window 72.
A changeover switch 73 is provided facing 72. The changeover switch 73 includes a changeover switch body 74 and a changeover section 75 provided to be slidable with respect to the changeover switch body 74.
In accordance with the sliding position of the switching unit 75, both power supply lines 35
It is configured to switch between a mode with a limiter that uses a vector sum of currents detected from the current value used as a current value and a mode without a limiter that uses the larger of the currents detected from the power supply lines 35 as a current value to be used. I have.

In the overcurrent alarm device main body 61, each current transformer 51
The detection signal detected by the
Current value judging means for judging that the used current value in the mode set in has reached the set current value, and a display unit 68 and a speaker 69 as alarm means when the set current value is reached. An overcurrent alarm circuit having a function of an alarm drive unit for issuing an alarm is provided. The alarm is activated by turning on multiple display units in sequence according to the current value,
The sound is displayed from 69 by sound announcement or alarm sound.

Then, when assembling the distribution board unit 12 including the limiter 21 as shown in FIG. 8, the changeover switch 73 on the mounting surface 71 of the overcurrent alarm device 26 is set to the mode with the limiter. Mounting surface 71 of overcurrent alarm device 26
Is mounted facing the device mounting plate 27.

When the changeover switch 73 of the overcurrent alarm device 26 is set to the mode with the limiter, the vector sum of the currents detected from the two power lines 35 is used as the used current value. When the current value set at 67 is reached, the display unit 68 and the speaker 69 warn in advance that the power consumption is excessive, that is, that the limiter 21 will be shut off.

When assembling the distribution board unit 12 without the limiter 21, the mounting surface of the overcurrent alarm device 26
After the changeover switch 73 in the switch 71 is set to the limiterless mode, the mounting surface 71 of the overcurrent alarm device 26 is mounted so as to face the device mounting plate 27.

When the changeover switch 73 of the overcurrent alarm device 26 is set to the limiterless mode, the larger of the currents detected from the respective power supply lines 35 is used as the used current value. When the current value set by the changeover switch 67 is reached, the display unit 68 and the speaker 69 warn in advance that the power consumption is over, that is, that the main breaker 22 will be shut off.

As described above, since the overcurrent alarm device 26 has the changeover switch 73 for switching between the mode with limiter and the mode without limiter, by switching the changeover switch 73, the limiter 21 is provided with one overcurrent alarm device 26. It can be used for both a distribution board and a distribution board without the limiter 21, which facilitates product management and inventory management, reduces the number of nameplates and boxes, and reduces costs.

Further, the changeover switch 73 for switching between the mode with limiter and the mode without limiter is set to the overcurrent alarm device 26.
Since the mode is set by the changeover switch 73, the changeover switch 73 can be concealed by mounting the overcurrent alarm device 26 to the device mounting plate 27 via the mounting surface 71. Erroneous operation of the changeover switch 73 by a switchboard contractor or user can be prevented, and a correct alarm can be issued.

Next, another embodiment of the overcurrent alarm device 26 will be described with reference to FIGS.

FIG. 3 is a perspective view of the overcurrent alarm device, FIG. 4 is a partial cross-sectional view of the overcurrent alarm device, and FIG. 5 is a partial cross-sectional view of the overcurrent alarm device when the changeover switch has an operation section. FIG. 6 is a perspective view of a changeover switch and an operation unit of the overcurrent alarm device, and FIG. 7 is a perspective view of the overcurrent alarm device in an attached state.

The overcurrent alarm device 26 is a main body of the overcurrent alarm device.
The overcurrent alarm device main body 61 includes a base 62 and a cover 63.

The base 62 is formed with a connecting portion 64 protruding from the cover 63, and a plurality of connecting terminals 65 to which the pair of detection lines 52 from the respective current transformers 51 are connected.
A plurality of connection screws 66 for tightening and loosening each connection terminal 65 are provided.

On the front side of the cover 63, a set current changeover switch 67 for setting a current value to be warned, a plurality of display sections 68 such as light emitting diodes (LEDs) as a warning means and a speaker 69, and the volume of the speaker 69 are switched. A volume switch 70 is provided.

On the side surface of the cover 63 of the overcurrent alarm device main body 61, a horizontally elongated window hole 81 is formed, and a changeover switch 73 is provided at an inner position facing the window hole 81. The changeover switch 73 includes a changeover switch body 74 and a changeover section 75 provided to be slidable with respect to the changeover switch body 74.
In accordance with the sliding position of the switching unit 75, both power supply lines 35
It is configured to switch between a mode with a limiter that uses a vector sum of currents detected from the current value used as a current value and a mode without a limiter that uses the larger of the currents detected from the power supply lines 35 as a current value to be used. I have. Changeover switch body
74 is mounted on the substrate 82 provided in the overcurrent alarm device main body 61 so that the switching unit 75 slides along the longitudinal direction of the window hole 81. A cover 83 for closing the window hole 81 is detachably attached to the window hole 81 by an adhesive tape or fitting.

Each of the current transformers 51 is provided in the main body 61 of the overcurrent alarm device.
The detection signal detected by the
Current value judging means for judging that the used current value in the mode set in has reached the set current value, and a display unit 68 and a speaker 69 as alarm means when the set current value is reached. An overcurrent alarm circuit having a function of an alarm drive unit for issuing an alarm is provided. This overcurrent alarm circuit is formed on the substrate 82. The alarm turns on a plurality of display units in sequence according to the current value, and the alarm that displays a sound with a sound or an alarm sound from the speaker 69, turns on the plurality of display units in order according to the current value,
The sound is displayed from the speaker 69 with a sound announcement or an alarm sound.

When assembling the distribution board unit 12 having the limiter 21 as shown in FIG. 8, a thin rod-shaped tool such as a screwdriver is inserted into the window 81 on the side of the overcurrent alarm device 26. The switching section 75 of the changeover switch 73 is set to the mode with a limiter, and after closing the window hole 81 with the cover 83, the overcurrent alarm device 26 is mounted on the device mounting plate 27.

When the changeover switch 73 of the overcurrent alarm device 26 is set to the mode with the limiter, the vector sum of the currents detected from the two power lines 35 is used as a current value to be used, and this current value is used as the set current changeover switch. When the current value set at 67 is reached, the display unit 68 and the speaker 69 warn in advance that the power consumption is excessive, that is, that the limiter 21 will be shut off.

When assembling the distribution board unit 12 without the limiter 21, a thin rod-like tool such as a screwdriver is inserted into the window hole 81 on the side of the overcurrent alarm device 26, and the changeover switch 73 is switched. After the section 75 is set to the limiter-less mode and the window hole 81 is closed with the lid 83, the overcurrent alarm device 26 is mounted on the device mounting plate 27.

When the changeover switch 73 of the overcurrent alarm device 26 is set to the no-limiter mode, the larger of the currents detected from the respective power supply lines 35 is used as the used current value. When the current value set by the changeover switch 67 is reached, the display unit 68 and the speaker 69 warn in advance that the power consumption is over, that is, that the main breaker 22 will be shut off.

As described above, since the overcurrent alarm device 26 has the changeover switch 73 for switching between the mode with limiter and the mode without limiter, by switching the changeover switch 73, the limiter 21 is provided with one overcurrent alarm device 26. It can be used for both a distribution board and a distribution board without the limiter 21, which facilitates product management and inventory management, reduces the number of nameplates and boxes, and reduces costs.

Further, since the changeover switch 73 for switching between the mode with limiter and the mode without limiter is provided at an inner position facing the window hole 81 on the side surface of the overcurrent alarm device main body 61, the changeover switch 73 is concealed and easily. The switch can be prevented from being operated, thereby preventing erroneous operation of the changeover switch 73 by a contractor or a user of the distribution board, and a correct alarm can be issued.

Further, since the cover 83 for closing the window hole 81 is detachably provided, the changeover switch 73 can be securely concealed, and the state of the changeover switch 73 can be checked by removing the cover 83 during maintenance. it can.

As shown in FIG. 5 and FIG. 6, a changeover switch is provided as necessary according to a request of a distributor of a distribution board.
When the operation of the switch 73 is enabled, the operation unit 84 which is detachably mounted on the changeover switch 73 and disposed in the window 81 is used without using the cover 83. The operating portion 84 has a square fitting hole into which a square switching portion 75 of the switch 73 is fitted at one end.
85, the other end of which is disposed in the window hole 81 and
It is arranged to slightly protrude from

As described above, by providing the operation section 84 which is detachably mounted on the changeover switch 73 and is disposed in the window 81, the changeover switch 73 can be easily operated as required.

FIGS. 9 to 12 show the distribution board main body.
7 shows a mounting structure of the power distribution unit 11 and the distribution board unit 12. The distribution board unit 12 shown in FIGS. 9 and 10 shows a case where a spare space 91 for installing a spare device other than the main breaker 22 and the branch breaker 23 is provided, and the distribution board unit 12 shown in FIG. This shows a case where the space 91 is not provided.

The distribution board main body 11 has a base 92 installed on the wall surface side, and a plurality of bosses for mounting both ends of the equipment mounting plate 27 of the distribution board unit 12 near both ends of the rear surface 93 of the base 92. 94 and 95 are provided. The protruding heights of the bosses 94 and 95 at both ends from the rear surface portion 93 are substantially the same.

Equipment mounting plate with spare space 91
27 has a main breaker mounting plate 101 for mounting the main breaker 22, a branch breaker mounting plate 102 for mounting the branch breaker 23, and a spare space mounting plate 104 on which a wooden base 103 for installing spare equipment is mounted. The boss 94 of the base 92 extends parallel to the end of the main breaker mounting plate 101.
A mounting portion 105 which is screwed to the boss 94 extends from an end of the spare space mounting plate 104, and a mounting portion 106 which is screwed to the boss 94 of the base 92 extends in parallel.

The height (front-back width) of the main breaker 22 is higher than the base 92 side, and the height (front-back width) of the branch breaker 23 is higher.
In order to arrange the front side of the main breaker 22 having the operation lever 39 and the front side of the branch breaker 23 having the operation lever 44 on substantially the same plane, the main breaker mounting plate 101 is provided on the base 92 side. Nearby, branch breaker mounting plate 102
Have different heights so as to be separated from the base 92. In consideration of arranging a high spare device in the spare space 91, the spare space mounting plate 104 is also close to the base 92 side and has a stepped height different from the branch breaker mounting plate 102. I have.

The equipment mounting plate 27 without the spare space 91 has a main breaker mounting plate 101 for mounting the main breaker 22 and a branch breaker mounting plate 102 for mounting the branch breaker 23. Mounting plate for main breaker 10
Attachment part 10 screwed to boss 94 of base 92 at one end
5 is formed, and the base is attached to the end of the branch breaker mounting plate 102.
An attachment portion 108 is formed on the boss 94 of the 92 via a spacer 107 so as to be screwed. The spacer 107 is provided as shown in FIG.
As shown in FIG. 2, a screw shaft 109 screwed to the boss 95 is protruded at one end at one end, and a screw hole (not shown) into which a screw inserted into the mounting portion 108 is screwed is formed at the other end. I have.

Generally, the boss at the right end of the base 92
95 is protruded higher from the rear surface portion 93 of the base 92 so that the mounting portion 108 of the branch breaker mounting plate 102 can be directly mounted, and the distribution board unit 12 having the spare space 91 is
The mounting part 106 at the end of the mounting plate 104 for spare space is used as a base.
It is bent away from the 92 side to match the height of the boss 95. Therefore, the width of the spare space 91 is reduced by the amount by which the mounting portion 106 is bent, and the dimension control of the spare space mounting plate 104 becomes difficult. On the other hand, the projecting height of the boss 95 from the rear surface portion 93 of the base 92 is reduced, and the mounting portion 106 is
By extending the spare space 91, the spare space 91 can be widened, the dimension of the spare space mounting plate 104 can be easily controlled, and if the spare space 91 is not provided, the spacer
107 can be used.

[0066]

According to the overcurrent alarm device of the first aspect, the changeover switch for switching between the mode with limiter and the mode without limiter is provided on the mounting surface side of the main body of the overcurrent alarm device. Later, by attaching the switch to a distribution board or the like via the mounting surface of the overcurrent alarm device main body, the changeover switch can be concealed, erroneous operation of the changeover switch can be prevented, and a correct alarm can be issued.

According to the overcurrent alarm device of the second aspect,
Since the changeover switch for switching between the mode with limiter and the mode without limiter is provided at an inner position facing the window on the side of the overcurrent alarm device main body, the changeover switch can be hidden and not easily operated. Prevents erroneous operation and gives correct alarm.

According to the overcurrent alarm device of the third aspect,
In addition to the effect of the overcurrent alarm device according to the second aspect, since the cover for closing the window is detachably provided, the changeover switch can be securely hidden.

According to the overcurrent alarm device of the fourth aspect,
In addition to the effect of the overcurrent alarm device according to the second or third aspect, since the operation unit is provided detachably mounted on the changeover switch and arranged in the window, the changeover switch can be easily operated as necessary. Operable.

According to the fifth aspect of the present invention, the distribution board body, the main breaker, the plurality of branch breakers, and the changeover switch are set to the limiterless mode. Since the current alarm device is provided, when an overcurrent occurs, an alarm can be correctly given by the overcurrent alarm device.

According to the distribution board described in claim 6, the distribution board main body, the limiter, the main breaker, the plurality of branch breakers, and the changeover switch are set to a mode with a limiter. Since the overcurrent alarm device is provided, an overcurrent alarm device can correctly alarm when an overcurrent occurs.

[Brief description of the drawings]

FIG. 1 shows an embodiment of an overcurrent alarm device and a distribution board according to the present invention, wherein (a) is a perspective view of the overcurrent alarm device as viewed from the front side, and (b) is a back surface of the overcurrent alarm device. It is the perspective view seen from the side.

FIG. 2 is a perspective view of the same overcurrent alarm device in the attached state.

FIG. 3 is a perspective view of an overcurrent alarm device according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a part of the overcurrent alarm device.

FIG. 5 is a cross-sectional view of a part of the overcurrent alarm device when the changeover switch includes an operation unit.

FIG. 6 is a perspective view of a changeover switch and an operation unit of the overcurrent alarm device.

FIG. 7 is a perspective view of the same overcurrent alarm device in the attached state.

FIG. 8 is a configuration diagram of a distribution board to which the overcurrent alarm device of each embodiment can be commonly applied.

FIG. 9 is a front view of another example of a distribution board with a cover removed.

FIG. 10 is a sectional view of the distribution board.

FIG. 11 is a sectional view showing still another example of the distribution board.

FIG. 12 is a perspective view of a spacer used in still another example of the distribution board.

[Explanation of symbols]

 11 Distribution board body 21 Limiter 22 Main breaker 23 Branch breaker 26 Overcurrent alarm device 51 Current transformer as current detection means 61 Overcurrent alarm device body 68 Display as alarm means 69 Speaker as alarm means 71 Mounting surface 73 Selector switch 81 Window hole 83 Lid 84 Operation part

Claims (6)

[Claims] An overcurrent alarm device main body having a mounting surface on a back surface; current detecting means for detecting a current flowing through each power line of a single-phase three-wire system having a plurality of power lines and a neutral line;
Provided on the mounting surface side of the overcurrent alarm device main unit, use the limiter mode that uses the vector sum of the currents detected from both power supply lines as the used current value, or use the larger of the currents detected from each power supply line A changeover switch for switching between a limiter mode and a current value limiter; and alarm means for giving an alarm when a current value used in the mode set by the changeover switch reaches the set current value. And overcurrent alarm device. 2. An overcurrent alarm device main body having a window hole on a side surface; a current detecting means for detecting a current flowing through each power supply line of a single-phase three-wire system having a plurality of power supply lines and a neutral line; The limiter mode, which is provided at an inner position facing the window of the current alarm device main body and uses a vector sum of currents detected from both power supply lines as a used current value, or a current detected from each power supply line, whichever is larger A changeover switch for switching to a limiter-free mode in which the current value is used as a current value; and an alarm unit for issuing an alarm when the current value used in the mode set by the changeover switch reaches the set current value. An overcurrent alarm device, characterized in that: 3. The overcurrent alarm device according to claim 2, further comprising a cover for removably closing the window hole. 4. The overcurrent alarm device according to claim 2, further comprising an operation unit detachably mounted on the changeover switch and disposed in the window. 5. A distribution board main body; a main breaker provided in the distribution board main body and connected to a single-phase three-wire wiring having a plurality of power supply lines and neutral wires; A plurality of branch breakers provided and connected to each power supply line and neutral line from the main breaker; provided in the distribution board body;
2. The switch according to claim 1, wherein the selector switch is set to a mode without a limiter.
And an overcurrent alarm device according to any one of (4) to (4). 6. A distribution board main body; a main breaker provided in the distribution board main body and connected to a single-phase three-wire type wiring having a plurality of power lines and neutral wires; A limiter provided and connected to the primary side of the main breaker; and a plurality of branch breakers provided in the distribution board main body and connected to each power supply line and neutral line on the secondary side of the main breaker; An overcurrent alarm device according to any one of claims 1 to 4, which is provided in the panel body, and wherein the changeover switch is set to a mode with a limiter.