JP3067276U - Protector for distribution board - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even if there is a light emitting element which is normally turned off at the time of inspection, it is determined that the light emitting element is not abnormally turned off. SOLUTION: Varistors Var1, Var3 are provided between three lines.
Light emitting diodes LED1, L as light emitting elements for indicators between neutral wire and other wires while connecting 2, 3
A power distribution panel protector in which ED2 is connected and the light emitting diodes LED1 and LED2 are arranged in parallel on the surface of the main body.
In a switchboard protector in which temperature fuses TF1 and TF2 disposed in the vicinity of 1, 2, and 3 are connected in series to light emitting diodes LED1 and LED2, among the light emitting diodes LED1 and LED2, a light emitting diode having a lower use order is used. The surface of the LED 2 is covered with a cutout 7c of the seal 7, and when the light emitting diode LED2 emits light, the cutout 7c is cut off and removed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a protector for a distribution board installed in a house distribution board for the purpose of protecting the human body and home appliances from abnormal voltages and currents such as lightning surges entering a low-voltage distribution line.

[0002]

[Prior art]

 Generally, a protector for a distribution board is configured as shown in FIG. In the figure, L1, L2 and N are power terminals, E is a ground terminal, TF1 and TF2 are thermal fuses, Var1, 2, and 3 are varistors, Arr is an arrester, R1 and R2 are resistors, D1 and D2 are diodes, and LED1 , LED2 is a light emitting diode. The light emitting diodes LED1 and LED2 serve as indicators that the protector is operating. Note that the varistors Var1, Var2, Var3 in the protector generate heat as they age, and the thermal fuses TF1, TF2 disposed close to these varistors are blown, thereby turning off the LED1, LED2. The basic operation of the above protector is that when the voltage between the power terminals exceeds a predetermined value, the varistor has a low resistance and conducts current to protect against overvoltage. When the voltage between the terminal and the earth terminal exceeds a predetermined value, the arrester operates and releases abnormal voltage and current to the ground.

[0003] This protector is originally connected to a single-phase three-wire type distribution line, but can be connected to other distribution lines. For example, when the single-phase two-wire system is connected to the two terminals of the power terminals L1 and N and used at 100 VAC, the light emitting diode LED1 is turned on and the remaining LED2 is turned off. Also, when connected to two wires of the power terminals L1 and L2 as a single-phase two-wire system and used at 200 VAC, both the light-emitting diodes LED1 and LED2 light up. When a single-phase three-wire system is connected to the power terminals L1, L2, and N and used at 100 V or 200 V, respectively, both of the light emitting diodes LED1 and LED2 light. Consumers should check this indicator, and if the one that should be lit is off, it means that the life of the protector has expired and the protector must be replaced with a new one.

[0004]

[Problems to be solved by the invention]

 By the way, in the case of the protector, when both indicators are lit, it can be clearly determined that the life is expired when any one of them disappears. However, if the protector is connected to a single-phase two-wire 100 VAC, it will be turned on one and the other one normally turned off. This makes it difficult for consumers to determine whether the lights are turned off due to the expiration of their service life or if they are turned off normally.If it is not clear, the user should read the instruction manual, etc., or make an inquiry to the power company's sales office, etc. I needed to. Nevertheless, the judgment was confused, and there were cases in which the light that was normally turned off was replaced by mistake. Therefore, when the protector is used at 100 VAC, it has been desired that the indicator display can be clearly judged.

[0005]

[Means for Solving the Problems]

 Therefore, in order to solve the above problem, the invention of claim 1 connects a varistor between each of the three wires, and connects a light emitting element for an indicator between the neutral wire and each of the other wires. A protector for a distribution board in which the pair of light emitting elements are arranged in parallel on a surface of a main body, wherein a temperature fuse arranged in proximity to the varistor is connected in series to the light emitting element. In addition, the surface portion of the light emitting element having the lower use order among the pair of light emitting elements is covered with a seal member that can be cut off.

According to a second aspect of the present invention, in the first aspect, a perforation is formed around a cut portion of the seal member.

[0007]

[Embodiment of the invention]

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external view of an embodiment of a switchboard protector according to the present invention, and FIG. 2 is a right side view of FIG. In the figure, reference numeral 1 denotes a protector main body, on which terminal blocks 2 and 3 and mounting holes 4 and 5 are formed at upper and lower sides. Two holes are formed in the upper and lower portions of the central convex portion 6 of the main body 1, and LEDs 1 and 2 are mounted therein. A seal 7 shown in FIG. 3 is attached to the entire surface of the convex portion 6.

In the seal 7, a hole 7a is formed at a position corresponding to LED1, a circular perforation 7b is formed at a position corresponding to LED2, and a cutout portion 7c is formed inside the perforation 7b. The perforation 7b of the seal 7 can be easily broken by pushing a finger into the perforation 7b, and the cutout 7c can be removed. FIG. 4 shows the protector main body 1 when the cutout portion 7c is removed from the seal 7, and both the LED1 and the LED2 are exposed. The seal 7 is made of paper, but may be made of another material as long as it can easily break and remove the cutout 7c.

When installing this protector on site, when using the single-phase two-wire AC100V, use the single-phase two-wire AC200V or single-phase three-wire AC100V / 200V with the cutout 7c as it is. Breaks the perforation 7b to remove the cutout 7c, exposing the LED2. In this way, when used with a single-phase two-wire AC100V in which one of the LEDs 2 remains turned off in a normal state, the LED 2 that is not turned on is covered with the seal 7 and is not visually observed. As a result, at the time of inspection of the distribution board by the customer, the LED2 that was originally turned off is covered with a seal and cannot be seen from the front, and the confusion of judgment by the turned off LED2 is resolved, The inspection will be carried out smoothly. In this embodiment, since the LED 1 is used in all cases of single-phase two-wire AC100V, single-phase two-wire AC200V, and single-phase three-wire AC100V / 200V, the "use order" in the claims is higher. On the other hand, since the LED2 is used selectively, the “use order” is lower.

Next, a specific example of a method of connecting a protector will be described. FIG. 5 shows a connection procedure when using a single-phase two-wire AC100V, and the connection is performed in the following procedure. Insert the L1 and N terminals of the protector into the L1 and N-phase terminals of the residential distribution panel, and securely connect them with the specified torque to prevent loosening. The protector is fixed to the residential distribution board with the mounting screw 8. Insert the ground wire (green) 9 into the ground terminal of the protector and connect with the terminal screw. Connect the ground wire 9 to the ground terminal on the distribution board. Attach the terminal cover 11 to the protector. This completes the connection.

FIG. 6 shows a connection procedure in the case of using a single-phase two-wire AC200V, and the connection is performed in the following procedure. The perforation 7b of the seal 7 is broken to remove the cutout 7c. Insert the L1 terminal of the protector into the L1 terminal of the residential distribution panel, and securely connect with the specified torque without loosening. In this case, the N-phase terminal is not connected. The protector is fixed to the residential distribution board with the mounting screw 8. Insert the power line (red) 10 into the L2 terminal of the protector and the ground wire (green) 9 into the ground terminal of the protector, and connect with the terminal screw. Connect the power line 10 to the L2 phase of the house switchboard and the ground wire 9 to the earth terminal of the house switchboard. Attach the terminal cover 11 to the protector. This completes the connection.

FIG. 7 shows a connection procedure when using a single-phase three-wire AC100V / 200V, and the connection is performed in the following procedure. The perforation 7b of the seal 7 is broken to remove the cutout 7c. Insert the L1 and N terminals of the protector into the L1 and N-phase terminals of the residential distribution panel, and securely connect them with the specified torque to prevent loosening. The protector is fixed to the residential distribution board with the mounting screw 8. Insert the power line (red) 10 into the L2 terminal of the protector and the ground wire (green) 9 into the ground terminal of the protector, and connect with the terminal screw. Connect the power line 10 to the L2 phase of the house switchboard and the ground wire 9 to the earth terminal of the house switchboard. Attach the terminal cover 11 to the protector. This completes the connection.

[0013]

[Effect of the invention]

 As described above, according to the present invention, the surface portion of the light emitting element having the lower use order is covered with the cutout of the sealing member, and the protector is provided with a single-phase two-wire AC200V, a single-phase three-wire AC100V / 200V. If used, break away the resection. This means that when the protector is used with single-phase, two-wire, 100 VAC, the light emitting elements that are turned off during normal operation are covered by the sealing member, and consumers are confused by the light emitting elements that are turned off. Will be resolved. Further, since the perforations are formed around the cut portion of the seal member, the removal of the seal member becomes easy.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment of a switchboard protector according to the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a perspective view showing a seal taken out of FIG. 1;

FIG. 4 is an external view showing a state in which a resection part is removed from FIG. 1;

FIG. 5 is a diagram showing a specific example of a method of connecting a protector.

FIG. 6 is a diagram showing a specific example of a method of connecting a protector.

FIG. 7 is a diagram showing a specific example of a method of connecting a protector.

FIG. 8 is a circuit diagram showing an internal configuration of the protector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protector main body 2, 3 Terminal block 4, 5 Mounting hole 6 Convex part 7 Seal 7a Hole 7b Perforation 7c Cut part LED1, LED2 Light emitting diode Var1, Var2, Var3 Varistor TF1, TF2 Temperature fuse,

Claims (2)

[Utility model registration claims] 1. A varistor is connected between each of the three wires, a light-emitting element for an indicator is connected between a neutral wire and another wire, and the pair of light-emitting elements are arranged in parallel on the surface of the main body. A switchboard protector, wherein a thermal fuse disposed in close proximity to the varistor is connected in series to the light emitting element, wherein the use order of the pair of light emitting elements is lower. A protector for a distribution board, wherein a surface portion of the light emitting element is covered by a seal member which can be cut off. 2. The protector for a distribution board according to claim 1, wherein a perforation is formed around a cut portion of the seal member.