JPS6353660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a small current leakage or disconnection device with a rated current of about 30 amperes.

It is desired that this type of earth leakage or disconnection switch be small in size, and in particular, that its installation area be small.

For example, the ones shown in Figures 1 and 2 are known as conventional earth leakage and disconnectors with a rated current of 30 amperes, and these earth leakage and disconnectors are of two-pole type, but three-pole type In the case of , the components are arranged in a two-dimensional manner. It consists of a case 1 and a cover 2 made of resin, a fixed contact 4 arranged in parallel near the bottom of one side of the case 1 and provided on a power supply side terminal 3, and a movable contact 7 connected to a load side terminal 5 via a conductor 6. A contact part 8 that can be connected and separated,
An opening/closing mechanism section 9 connected to a movable contact 7 and a conductor 6
A zero-phase current transformer 10 that is inserted into the zero-phase current transformer 10 to detect current leakage; The main component includes a drive electromagnet 12 that opens the contact portion 8 via the drive electromagnet 12 . The opening/closing mechanism section 9 is provided with an operating lever 9a that extends from an opening 2a provided on the upper side of the cover 2 and controls the connection and disconnection of the contact section 8, and the amplifying section 11 is equipped with a test circuit 13 above it. The test circuit 13 is provided with an operation button 13a that can be operated from the outside of the cover 2. In operation, when a current leakage is detected by the zero-phase current transformer 10, its secondary output is amplified by the amplifier 11, and an ignition signal is given to an internal ignition element such as a thyristor to excite the electromagnet 12 to operate it. , the holding of the opening/closing mechanism section 9 is released and the contact section 8 is opened.

In the above configuration, as is clear from the diagram, the electrical leakage and disconnection have the advantage of being easy to assemble because the components are arranged in a flat manner as described above, but there is wasted space inside the cover 2. As a result, there was a drawback that the width was wide, that is, a large installation area was required.

Further, the test circuit uses a push button switch as disclosed in Japanese Patent Application Laid-Open No. 53-79277, and this push button switch occupies a relatively large area, which hinders miniaturization.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a small-sized, particularly small-current type earth leakage interrupter with a small installation area.

According to the present invention, the above object includes a case and a cover made of an insulating material, a fixed contact arranged in parallel inside the case and provided on a power supply side terminal, and a fixed contact that can be connected to and separated from the fixed contact and connected to a load terminal via a conductor. a multi-pole contact section consisting of a movable contact; an opening/closing mechanism that connects and disconnects the contact section by means of an operating lever connected to the movable contact and protruding from the cover; and a zero-phase current transformer fitted into the conductor. an amplification section for amplifying the output; a test circuit having an operation button protruding from the cover and a resistor inserted between the lines when the operation button is operated; In an earth leakage or disconnection switch equipped with an electromagnet for opening a part, a contact part is placed on the power supply side terminal side and a zero-phase current transformer is placed on the load side terminal side, sandwiching the switching mechanism, and the amplification part is The zero-phase current transformer is covered with a resin cover and placed in front of the zero-phase current transformer, the electromagnet is placed in front of one pole of the contact part, and the test circuit resistor and operation button are placed in front of the resin cover of the amplifier. This is achieved by arranging a movable piece that comes into contact with the lead wire of the resistor.

Embodiments of the present invention will be described below based on the drawings. In FIGS. 3 to 6, parts corresponding to those of the conventional type shown in FIG. 1 are designated by the same reference numerals to avoid detailed explanation, and the explanation will mainly be given to the arrangement of the different components. First, the width of the case 1 and cover 2 is the power supply side and load side terminals 3 and 5.
It is determined by the contact part 8 including
The zero-phase current transformer 10 is inserted into these conductive parts, and the switching mechanism part 9 is also connected to the contact part 8, and as a matter of course, it also has an amplifier part 11 including a test circuit 13, and a driving part. The electromagnets 12 for use are placed on the front surface of the conductive part so as to be sandwiched between the upper and lower sides of the opening/closing mechanism part 9. The electromagnet 12 is arranged on the front side of one pole of the contact section 8, the amplification section 11 is arranged on the front side of the zero-phase current transformer 10, and the push button of the operation button 13a of the test circuit 13 is also arranged on the operation lever 9a that comes out from the cover 2. is arranged in the axial direction of the operating direction. Note that a presser cover 14 is attached to the amplifier section 11, as shown in FIGS. 5 and 6, which can be attached and detached with a one-touch operation.
4a, and leg portions 14c that extend with spring properties from both sides of the cover portion 14a and have locking claws 14b at their tips that can be engaged with the recesses 1a provided in the case 1.

A resistor 13b constituting the test circuit 13 is arranged on the front side of the presser cover 14 that covers the amplifying section 11, and the free end of the resistor 13b comes into contact with the lead wire 13c by operating the operation button 13a. The movable pieces 13d are opposed to each other. By constructing the test circuit 13 from the resistor 13b and the movable piece 13d facing the lead wire 13c of the resistor 13c, the height of the test circuit can be reduced.

As explained above, by configuring the test circuit from a resistor and a movable piece whose free end faces the resistor's lead wire, the height of the test circuit can be reduced. The current transformer, amplifier, and test circuit can be stacked in three stages, making the leakage and disconnection smaller.In particular, the width can be reduced without increasing the height, making the leakage and disconnection easier to handle. can be provided.

[Brief explanation of the drawing]

Figure 1 is a plan view with the cover removed showing an example of a conventional leakage or disconnection with a rated current of 30 amperes.
The figure is a vertical sectional view taken along the - line in Figure 1, Figure 3 is a plan view with the cover removed showing an embodiment of the current leakage and disconnection device with a rated current of 30 amperes according to the present invention, and Figure 4 is a cross-sectional view taken along the - line in Figure 1. FIG. 5 is a perspective view of the main part of FIG. 4, and FIG. 6 is a sectional view of the main part showing the attached state of the members shown in FIG. 4. 1... Case, 2... Cover, 3... Power supply side terminal, 4... Fixed contact, 5... Load side terminal, 6...
Conductor, 7... Movable contact, 8... Contact section, 9... Opening/closing mechanism section, 9a... Operating lever, 10... Zero-phase current transformer, 11... Amplifying section, 12... Electromagnet, 13...
...Test circuit, 13a...Test switch.

Claims (1)

[Claims] 1 A case and a cover made of insulators, a fixed contact arranged in parallel inside the case and provided on the power supply side terminal, and a plurality of movable contacts that can be connected to and separated from the fixed contact and connected to the load side terminal via a conductor. a contact portion of a pole, an opening/closing mechanism that connects and disconnects the contact portion using an operating lever connected to the movable contact and protruding from the cover, and an amplifier unit that amplifies the output of the zero-phase current transformer fitted into the conductor. a test circuit having an operation button protruding from the cover and having a resistor inserted between the lines when the operation button is operated; and an electromagnet driven by the output of the amplification section to open and close the contact section via the opening/closing mechanism. In the earth leakage and disconnection switch, a contact part is arranged on the power supply side terminal side, and a zero-phase current transformer is arranged on the load side terminal side, sandwiching the switching mechanism,
The amplifying section is covered with a resin cover and placed in front of the zero-phase current transformer, the electromagnet is placed in front of one pole of the contact part, and a test circuit resistance is placed in front of the resin cover of the amplifier. An earth leakage or disconnection device characterized in that a movable piece is arranged which comes into contact with the lead wire of the resistor by means of a device and an operation button.