JP3081282U - Earth leakage breaker - Google Patents

Abstract

(57) [PROBLEMS] To provide an earth leakage circuit breaker configured to include a zero-phase current transformer, an electronic circuit unit, a trip coil, and a test switch, and have a structure capable of improving productivity and reducing manufacturing costs. I do. SOLUTION: A zero-phase current transformer 221 for detecting a leakage current,
An electronic circuit unit 222 that amplifies the current detected from the zero-phase current transformer 221; a trip coil 223 that trips the opening / closing mechanism unit 114 based on a signal from the electronic circuit unit 222;
The test switch 224 for testing the trip operation of 23 is mounted on one circuit board to constitute an earth leakage breaker.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an earth leakage breaker, and more particularly to a structure of an earth leakage breaker including a zero-phase current transformer, a trip coil, a test switch, and an electronic circuit unit.

[0002]

[Prior art]

 Generally, an earth leakage breaker is a device that detects an overcurrent or a leakage current in a load line and detects and shuts off the overcurrent or a leakage current, thereby protecting an accident on an electric line (electric line). In the conventional earth leakage breaker, as shown in FIG. 2, a casing 10, a power supply side connection terminal 11 mounted inside the casing 10, and a partition inside the casing 10 in contact with the power supply side connection terminal 11. A fixed contact stand 12 adhered to the wall, a movable contact stand 13 urged and supported on one side of the fixed contact stand 12 by a coil spring and a lever, and contacting or separating from the fixed contact stand 12; An opening / closing mechanism 14 that is engaged with the inner side wall of the casing 10 on one side of the movable contact stand 13 in a lever-like manner and swings the movable contact stand 13, and that is formed so as to protrude outside the casing 10 and is formed. A handle 18 for manually operating the switch 14, a bimetal 15 joined to one side of the opening and closing mechanism 14 to trip the opening and closing mechanism 14 when an overcurrent occurs, and welding to the bimetal 15 The soft copper wire 16 connected to the load-side connection terminal 17, the zero-phase current transformer 21 attached to the inside of the casing and detecting a leakage current, and the zero-phase current transformer 21 An electronic circuit section 22 for amplifying and discriminating the received signal, a trip coil 23 for tripping the opening / closing mechanism section 14 by a trip signal from the electronic circuit section 22, and a test switch 24 for testing the trip operation of the trip coil 23. And a test button 25 protruding from the outer upper surface of the casing 10 to confirm and check the breaking performance by the current.

That is, in such a conventional earth leakage breaker, a substrate (not shown) having an electronic circuit section 22 is mounted on the bottom surface of the earth leakage breaker, and a zero-phase current transformer 21, a trip coil 23, and The test switches 24 were all mounted on boards (not shown) different from the electronic circuit section 22. In the operation of the conventional earth leakage circuit breaker configured as described above, when an overcurrent flows through the electric circuit, the electric circuit is interrupted by thermal expansion of the bimetal 15, and when a leakage current occurs, the zero-phase current transformer is operated. 21 detects this leakage current, and the trip coil 23 trips the opening / closing mechanism 14, so that the electric circuit is interrupted.

[0004]

[Problems to be solved by the invention]

 In such a conventional earth leakage circuit breaker, the zero-phase current transformer, the trip coil, and the test switch are each provided on a substrate different from the electronic circuit unit, so that the manufacturing process is complicated, and the product is complicated. However, there was an inconvenience that the quality and productivity of the products decreased and the costs increased.

In addition, since a plurality of substrates are used, there is an inconvenience that the capacity of the earth leakage breaker increases. An object of the present invention is to provide an earth leakage breaker that can improve productivity and reduce costs by mounting and configuring a zero-phase current transformer, a trip coil, a test switch, and an electronic circuit unit on a single circuit board. To provide.

[0006]

[Means for Solving the Problems]

 To achieve such an object, the earth leakage breaker according to the present invention includes a zero-phase current transformer for detecting a leakage current, and an electronic circuit unit for amplifying the current detected from the zero-phase current transformer. In addition, a trip coil for tripping the opening / closing mechanism section by a signal of the electronic circuit section and a test switch for testing a leakage cutoff operation are mounted on one circuit board.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the earth leakage breaker according to the present invention includes a casing 110, a power supply side connection terminal 111 mounted inside the casing 110, and a power supply side connection terminal 111 in contact with the power supply side connection terminal 111. A movable contact 113 having a fixed contact table 112 adhesively formed on the partition wall, and a movable contact 113a urged and supported on one side of the fixed contact table 112 by a coil spring and a lever to contact or separate from the fixed contact table 112; The base metal 113 is engaged with the movable contact base 113 and is connected to the load-side connection terminal 117 mounted on the partition wall inside the casing 110 via the soft copper wire 116. An opening / closing mechanism 114 freely engaged with the handle 1, which is engaged with the opening / closing mechanism 114 and protrudes out of the casing 110. And a zero-phase current transformer 221 that is mounted inside the casing 110 on one side of the opening / closing mechanism 114 and detects a leakage current, and amplifies a signal detected from the zero-phase current transformer 221. And a circuit board 220 on which a trip coil 223 for tripping the opening / closing mechanism 114 in response to a trip signal of the electronic circuit unit 222 and a test switch 224 for testing a trip operation are provided. It is configured.

That is, the present invention is characterized in that the electronic circuit unit 222 is mounted on a circuit board 220 having a zero-phase current transformer 221, a trip coil 223 and a test switch 224. . In addition, a test button 225 for confirming and checking the breaking performance by the current is protrudingly formed on the outer upper surface of the casing 110.

Hereinafter, the operation of the earth leakage breaker according to the present invention will be described. First, when the fixed contact base 112 and the movable contact base 113 are in contact with each other to form an electric circuit, and an overcurrent flows through the earth leakage breaker, the bimetal 115 in contact with the movable contact base 113 causes Joule heat. As a result, the opening / closing mechanism 114 is tripped, and the movable contact base 113 is separated from the fixed contact base 112 by the opening / closing mechanism 114 to cut off the electric circuit.

When a leakage current flows through the earth leakage breaker, the leakage current is detected from the zero-phase current transformer 221 and a detection signal is transmitted to the electronic circuit unit 222. A signal is transmitted to the trip coil 223, and the trip coil 223 trips the opening / closing mechanism 114 to cut off the electric circuit. As described above, in the present invention, since all of the zero-phase current transformer 221, the electronic circuit section 222, the trip coil 223, and the test switch 224 are mounted on one circuit board 220, a plurality of circuits as in the related art are used. There is no need to solder and connect the boards one by one.

Furthermore, the present invention is not limited to such an embodiment, and can be used in various forms without departing from the scope of the utility model registration request.

[0012]

[Effect of the invention]

 As described above, the earth leakage breaker according to the present invention is configured by mounting all zero-phase current transformers, electronic circuits, trip coils, and test switches on one circuit board, thereby improving productivity. This has the effect of reducing manufacturing costs. Further, since the zero-phase current transformer and the electronic circuit are all mounted on one circuit board, the mounting space can be reduced and the earth leakage breaker can be downsized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an earth leakage breaker according to the present invention.

FIG. 2 is a longitudinal sectional view showing a configuration of a conventional earth leakage breaker.

[Explanation of symbols]

 112: Fixed contact stand 113: Movable contact stand 114: Opening / closing mechanism 220: Circuit board 221: Zero-phase current transformer 222: Electronic circuit 223: Trip coil 224: Test switch

Claims (1)

[Utility model registration claims] 1. A zero-phase current transformer for detecting a leakage current, an electronic circuit for amplifying and outputting a current detected from the zero-phase current transformer, and a switching mechanism based on an output signal of the electronic circuit. And a test switch for testing the trip operation of the trip coil, wherein the zero-phase current transformer, the trip coil, the test switch, and the electronic circuit unit are all one. An earth leakage breaker provided on a circuit board.