JPH0236202Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a plug-type earth leakage breaker having a plug that is inserted into an outlet as a power supply side terminal.

[Conventional technology]

As a conventional device of this type of plug-type earth leakage breaker, one is known that shows a plan view and a vertical cross-sectional view, respectively, in FIGS. 7 and 8.

In the figure, screws 2 are attached to the base 1a of the insulating case 1.
The plug 3 is fixed by the plug 3, and the primary conductor 4 whose one end is connected to the plug 3 passes through the zero-phase current transformer 5 and is connected to the movable contact base 7 provided in the opening/closing section 6.
A movable contact 8 is integrated at the tip of the movable contact base 7, and a load-side screw terminal 9 is mounted on the opposite side of the movable contact 8.
Fixed contacts 10 integrated with a and 9b are arranged so as to be able to come into contact with and separate from them. In addition, a current leakage occurs in the load circuit (not shown) connected to the screw terminals 9a and 9b on the upper side of the plug 3, and the voltage generated in the secondary winding of the zero-phase current transformer 5 is detected and the switching section 6 is activated. A control unit 11 for operating the switch is provided, and above the control unit 11 there is a test button device 12 that supplies a simulated leakage current to check whether the opening/closing unit 6 operates normally when a leakage occurs in the load-side electrical circuit. is provided. and push button 1 of test button device 12
Zero-phase current transformer 5, with the tip of 2a protruding;
The opening/closing part 6 and the control part 11 are connected by an insulating cover 13.
The screw terminals 9a and 9b are each covered by a screw terminal cover 15 provided with an insulating tube 14 for introducing an electric wire.

In this plug-type earth leakage breaker, when a current leakage occurs in the load-side electrical circuit with the switching section 6 in the closed state, a voltage is generated in the secondary winding of the zero-phase current transformer 5, which is transferred to the control section 11.
The movable contact 8 opens and closes from the fixed contact 10 by detecting and amplifying the signal and driving the opening/closing unit 6 .

[The problem that the idea attempts to solve]

The conventional plug-type earth leakage circuit breaker mentioned above has a relatively simple structure and is easy to handle, but since the load side terminal is a screw terminal, it can only be applied to loads with screw terminal connections, and cannot be applied to loads with outlet connection. However, it has the disadvantage that a dedicated plug-type earth leakage breaker must be provided for each type of load.

Therefore, the purpose of the present invention is to provide a plug-type earth leakage breaker that eliminates the drawbacks of the conventional device described above and allows two types of connection methods, a screw terminal connection method and an outlet connection method, to be obtained with minimal replacement of parts. It is about providing.

[Means to solve the problem]

In order to achieve the above object, the present invention focuses on the fact that the screw terminal connection method requires an insulating tube for inserting the electric wire connected to the screw terminal, but the outlet connection method does not require the insulating tube. According to the present invention, the above-mentioned purpose is to provide a power supply side plug fixed to an insulating case, and a primary conductor whose one end is connected to the plug and the other end is connected to the opening/closing part. A penetrating zero-phase current transformer, a control unit that detects the voltage generated in the secondary winding of this zero-phase current transformer and operates the opening/closing part, and a test button device that sends a simulated leakage current by operating a push button. and the zero-phase current transformer, switching section, control section,
a screw terminal comprising a common part consisting of an insulating cover that covers the test button device so that the push button of the test button device protrudes outside, the screw terminal being fixed to the insulating case and connected to the fixed contact of the opening/closing part;
A screw terminal connection system component consists of a removable terminal cover that covers the screw terminal and is attached with an insulating sleeve for inserting the electric wire connected to the screw terminal, and a screw terminal cover that is fixed to the insulating case and connected to the fixed contact of the opening/closing part. An outlet connection system component consisting of a plug-in jack integrated with the screw terminal and a removable jack terminal cover that covers the plug-in jack integrated with the screw terminal can be replaced and installed in the common part. shall be.

[Effect]

According to the present invention, the plug has a plug fixed to an insulating case, and a screw terminal is provided in a common part consisting of a zero-phase current transformer, a switching part, a control part, a test button device, etc. By attaching a screw terminal connection type component consisting of a removable terminal cover to which an insulating tube for inserting electric wires connected to the screw terminal is attached, a plug type earth leakage breaker with a screw terminal connection type can be obtained. Instead of the screw terminal connection type parts, an outlet connection type part is installed, which consists of a plug jack integrated with the screw terminal and a removable jack terminal cover that covers the screw terminal and the plug jack. A plug-type earth leakage breaker can be obtained.

〔Example〕

Figures 1 to 6 are diagrams showing an embodiment of a small electric device, such as an earth leakage breaker, according to this invention.
Fig. 1 is a plan view with the cover removed, Fig. 2 is a vertical sectional view, Fig. 3 is a plan view of the main part, Fig. 4 is a side view of Fig. 3, Fig. 5 is a plan view of the main part, and Fig. 6 is a plan view of the main part. The figure is a side view of FIG. 5. In the figure, parts that are the same as those of the conventional device shown in FIG.

This embodiment differs from the conventional device shown in FIGS. 7 and 8 in that the screw terminals 9a and 9b shown in FIGS.
Each screw terminal 9a, 9b is replaced with a screw terminal connection type component consisting of a screw terminal cover 15 to which an insulating tube 14 for inserting electric wires connected to the terminals 9a, 9b is attached.
The main point is that an outlet connection system component consisting of a jack 17 integrated through connecting wires 16a and 16b, and a jack terminal cover 18 that covers each screw terminal 9a and 9b and the jack 17 is attached. The jack 17 includes jack parts 17a and 17b that differ by 90 degrees in the insertion direction, and the jack terminal cover 1
8 is provided with insertion ports 18a and 18b corresponding to jack portions 17a and 17b, respectively. Then, the jack terminal cover 18 is attached to the base 1.
It is removably attached to the insulating case 1 from the back side of a with screws 19, and each jack part 17a, 1
7b is the corresponding outlet 18a, 1
8b.

As is clear from this example, insulating case 1
A zero-phase current transformer that is penetrated by a plug 3 fixed to the base 1a with screws 2, and a primary conductor 4 whose one end is connected to the plug 3 and the other end is connected to the movable contact block 7 of the opening/closing part 6. 5, a control unit 11 that detects the voltage generated in the secondary winding of this zero-phase current transformer 5 and operates the switching unit 6, a test button device 12, and a push button 12a of the test button device 12, which is connected to the outside. The test button device 12, the zero-phase current transformer 5, the opening/closing part 6,
An insulating cover 13 that covers the control unit 11 is formed as a common part. By attaching the screw terminal connection type parts shown in FIGS. 7 and 8, which consist of the screw terminal cover 15 to which the screw terminals 9a and 9b and the insulating tube 14 are attached, to this common part, the screw terminal connection type is realized. This is a plug-type earth leakage breaker with a screw terminal connection type, whereas the outlet connection type does not require the insulating tube 14 (see Figure 8). Screw terminal 9 in the space where 14 was removed
A jack 17 integrated with parts a and 9b is arranged.

As described above, the screw terminals 9a, 9b are provided in a common part including the plug 3 fixed to the insulating case 1, the zero-phase current transformer 5, the opening/closing part 6, the control part 11, and the test button device 12. By attaching the jack 17 integrated into the jack 17 and the jack terminal cover 18 that covers the screw terminals 9a and 9b and the jack 17, it is possible to replace relatively fewer parts compared to a plug-type earth leakage breaker with a screw terminal connection. Therefore, it is possible to obtain an earth leakage breaker that connects to an outlet.

[Effect of idea]

As explained above, according to the present invention, there is a zero-phase transformer through which the power supply side plug fixed to the insulating case and the primary conductor whose one end is connected to this plug and the other end is connected to the opening/closing part. A sink and
A control unit that detects the voltage generated in the secondary winding of the zero-phase current transformer and operates the switching section, a test button device that flows a simulated leakage current by operating a push button, and the zero-phase current transformer, the switching section. a common part consisting of an insulating cover that covers the part, the control part, and the test button device so that the push button of the test button device protrudes to the outside, and is fixed to the insulating case and connected to the fixed contact of the opening/closing part. A screw terminal connection system component consisting of a screw terminal, a removable terminal cover that covers the screw terminal and is fitted with an insulating sleeve for inserting a wire connected to the screw terminal, and a fixed contact of the opening/closing part that is fixed to the insulating case. An outlet connection method component consisting of a plug-in jack integrated with a screw terminal connected to the screw terminal and a removable jack terminal cover that covers the plug-in jack integrated with the screw terminal can be replaced and installed in the common part. By doing so, it is possible to obtain two types of plug-type earth leakage circuit breakers, one for screw terminal connection and one for outlet connection, with minimal parts replacement, and the plug-type earth leakage circuit breaker can expand the range of application with a small investment. It has the effect of being able to provide the following.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the plug-type earth leakage breaker according to this invention. Figure 1 is a plan view with the cover removed, Figure 2 is a longitudinal sectional view, and Figure 3 is the main part. A plan view, FIG. 4 is a side view of FIG. 3, FIG. 5 is a plan view of the main part, FIG. 6 is a side view of FIG. 5, and FIGS. This figure shows an example, and Figure 7 is a plan view with the cover removed.
FIG. 8 is a longitudinal sectional view. 1: Insulating case, 3: Plug, 9a, 9b: Screw terminal, 13: Insulating cover, 15: Screw terminal cover, 17: Jack, 17a, 17b: Jack part, 18: Jack terminal cover.

Claims (1)

[Scope of utility model registration request] A power supply side plug fixed to an insulating case, a zero-phase current transformer through which the primary conductor passes through, one end of which is connected to this plug and the other end connected to the switching part, and the second of this zero-phase current transformer. A control unit that detects the voltage generated in the next winding and operates the switching section, a test button device that flows a simulated earth leakage current by operating a push button, and the zero-phase current transformer, the switching section, the control section, and the test button device. a common part consisting of an insulating cover provided so that the push button of the test button device protrudes to the outside; a screw terminal fixed to the insulating case and connected to a fixed contact of the opening/closing part; A screw terminal connection system component consisting of a removable terminal cover to which an insulating sleeve for inserting a wire connected to the screw terminal is attached, and a screw terminal that is fixed to the insulating case and connected to the fixed contact of the opening/closing part is integrated. plug-in jack,
A plug-type earth leakage breaker characterized in that an outlet connection system component consisting of a removable jack terminal cover that covers a plug-in jack integrated with the screw terminal can be replaced and attached to the common part.