JPH065088U - Test button device for earth leakage circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] The contact stroke margin of the contact is large even in a narrow installation space, and the contact leaf springs 15 and 16 are not permanently deformed or damaged. [Configuration] A test button 1 for confirming a leakage detection function is provided on a cover 2 of the leakage breaker. U below the test button 1
When the first contact leaf spring 15 curved in a letter shape is provided and the test button 1 is pressed, the first contact leaf spring 15 is bent and deformed and comes into contact with the second contact leaf spring 16. Since the second contact leaf spring 16 is also formed in a U shape and is elastically deformable, it is curved and deformed together with the first contact leaf spring 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a test button device for an earth leakage breaker.

[0002]

[Prior art]

 The operation principle of the test button of the earth leakage breaker will be described with reference to FIG. First and second contact leaf springs 5 and 6 are provided below the test button 1 attached to the cover 2 of the earth leakage breaker, and the first and second contact leaf springs 5 and 6 are provided. 6, one of which is connected to the first main circuit conductor via a lead wire, and the other of which is connected to the second main circuit via the leakage detection circuit unit and the tertiary winding of the zero-phase current transformer. Connected to conductor.

When the test button 1 is pressed, the leaf springs 5 and 6 for contact are brought into contact with each other, a current flows through the third winding of the zero-phase current transformer, and the balance of the zero-phase current transformer that is in the equilibrium state is maintained. The output signal of the zero-phase current transformer is output to the trip device via the leakage detection circuit, causing the circuit breaker to trip and confirming the operation.

[0004]

[Problems to be solved by the device]

 However, due to the structure of the contact leaf springs 5 and 6 in the conventional test button device, when the test button 1 is strongly pressed for a long time, the test of the first contact leaf spring 5 is performed as shown by the dotted line. The intermediate part, which is the contact part with the button 1, is deformed and does not return to its original state, so that the contact is kept closed, or the deformed parts of the contact leaf springs 5 and 6 are broken and Could open the circuit. If the leaf springs 5 and 6 for the contacts are deformed or broken, the operation check becomes impossible even though the test button device is for checking the operation of the earth leakage breaker. However, there is a problem that the test state is maintained and the trip state is left, and the original purpose of improving the reliability of the earth leakage breaker cannot be fulfilled.

Further, permanent deformation of the contact leaf springs 5 and 6 narrows the gap between the first contact leaf spring 5 and the second contact leaf spring 6, which may result in poor withstand pressure. It was Particularly, since the circuit breaker of recent years has been downsized and the space for arranging the first and second leaf springs 5 and 6 for the contact in the test button device has been reduced accordingly, the circuit breaker can be accommodated in this narrow space. Moreover, it has become difficult to provide a test button device with a certain margin of contact stroke.

The present invention has been made in consideration of the above points, and provides a contact leaf spring that can have a large contact stroke margin of a contact even in a narrow installation space and is not permanently deformed or damaged. It is an object to provide a test button device for an earth leakage breaker equipped with the test button device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a test button provided on a cover of an earth leakage circuit breaker for confirming an earth leakage detection function, a first contact leaf spring pressed by the test button, and a first contact. Of the earth leakage breaker having a first leaf spring for contact and a second leaf spring for contact which can be separated from each other, and the first and second leaf springs for contact are connected to a main circuit through a zero-phase current transformer. In the test button device, the second leaf spring for contact is configured to be elastically deformable along the pressing direction of the test button.

[0008]

[Action]

 According to this structure, the first and second contact leaf springs can be elastically deformed in the pressing direction of the test button, so that an unreasonable force acts on the entire contact leaf spring to permanently deform them. Moreover, it is less likely to be damaged, and the contact area can be kept stable.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 3 and 4, the earth leakage breaker accommodates the interruption element and the earth leakage detection element in the cover 2 and the case 3, and the load terminal 8a and the power supply terminal 8b to which the main circuit conductor is connected are provided on both sides thereof. It is provided. The test button device for confirming the leakage detection function is provided on the upper portion of the leakage breaker, and the test button 1 attached to the cover 2 and the first and second leaf springs 5 for contact provided on the leakage detection circuit board 4 are provided. , 16 and the first and second leaf springs 15 and 16 for contact have one of them connected to, for example, the U-phase on the load terminal 8a side via a lead wire, and the other of which includes the leakage detection circuit board 4. The leakage detection circuit unit 7 and the zero-phase current transformer 9 are connected to the W-phase via the tertiary winding 10.

FIG. 1 is an enlarged sectional view of the test button device in a normal state, and FIG. 2 is an enlarged sectional view of the test button device in an operating state. As shown in FIG. 1, the first and second contact leaf springs 15 and 16 are each bent in a substantially U-shape so as to be elastically deformed and attached to the leakage detection circuit board 4, and are bent with a large curvature. The first contact leaf spring 15 thus arranged is arranged below the test button 1, and the second contact leaf spring 15 curved with a small curvature is arranged below the first contact leaf spring 15. . Therefore, when the test button 1 is pressed, as shown in FIG. 2, the upper end of the first contact leaf spring 15 is pressed toward the leakage detection circuit board 4 side and comes into contact with the second contact leaf spring 16. Further, the pressing force of the test button 1 acts to bend the second contact leaf spring 16 via the first contact leaf spring 15. Therefore, the first and second leaf springs 15 and 16 for the contacts come into contact with each other along the pressing direction of the test button 1 without difficulty, and the third winding 10 of the zero-phase current transformer 9 is energized so that the leakage detection circuit unit 7 This allows the tripping device 11 to operate. When the pushing of the test button 1 is released, the contact leaf springs 15 and 16 return the test button 1 to the original position due to the restoring force, and return to the state of FIG.

In the test button device of the earth leakage breaker configured as described above, since the second contact leaf spring 16 can elastically deform along the pressing direction of the test button 1, the contact button can be used even in a narrow installation space. Has a large contact stroke, and when the first and second contact leaf springs 15 and 16 make contact operation, the first and second contact leaf springs 15 and 16 are permanently deformed or broken. It is possible to prevent this from happening and fully fulfill the role of contact point. Moreover, since the contact area of the contact is increased, the contact reliability can be improved.

In the above embodiment, the case where the second contact leaf spring 16 is curved in a substantially U shape has been described, but another shape that is elastically deformable in the pressing direction of the test button 1 is adopted. You can also do it.

[0013]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a test button device for an earth leakage breaker including a contact leaf spring that allows a large contact stroke of a contact even in a small installation space and does not permanently deform.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a normal state showing an embodiment of a test button device for an earth leakage breaker according to the present invention.

FIG. 2 is an enlarged cross-sectional view of an operating state of the test button device shown in FIG.

3 is a cross-sectional view showing a partial cross section of an earth leakage breaker including the test button device of FIG.

FIG. 4 is a partial cross-sectional plan view of an earth leakage breaker including the test button device of FIG.

FIG. 5 is a sectional view showing a conventional test button device.

[Explanation of symbols]

Reference numeral 1 is a test button, 2 is a cover, 3 is a case, 4 is a leakage detection circuit board, 5 and 15 are first contact leaf springs, and 6 and 1.
6 is a leaf spring for the second contact, 7 is a leakage detection circuit unit,
8a is a load terminal, 8b is a power supply terminal, 9 is a zero-phase current transformer, 1
Reference numeral 0 indicates a tertiary winding, and 11 indicates a trip device.

Claims (1)

[Scope of utility model registration request] 1. A test button provided on a cover of an earth leakage breaker for confirming an earth leakage detection function, a first contact leaf spring pushed by the test button, and a first contact leaf spring being separable from each other. A second contact leaf spring, wherein the first and second contact leaf springs are connected to the main circuit via a zero-phase current transformer. 2. A test button device for an earth leakage circuit breaker, characterized in that the second contact leaf spring is formed into a shape that allows elastic deformation along the pressing direction of the test button.