JP4291805B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker that connects power from a power source to a load via a contact and automatically shuts off the contact due to an overload or a short-circuit accident, and is particularly excellent in usability and ease of assembly and at low cost. The present invention also relates to a circuit breaker having a structure suitable for standardization of advanced parts.

  In the structure of a circuit breaker including a conventional earth leakage breaker, the main circuit generally has a power source terminal block, a fixed contact, a movable contact, a movable contact block, and a flexible circuit for each pole (for example, three poles). Consists of a conductor, overcurrent relay section, and load side terminal block. The mechanism is linked to the movable contact block of each pole, and the zero-phase current transformer (ZCT) for detecting leakage is the main circuit of each pole. Is installed to penetrate. The zero-phase current transformer is connected to a leakage detection / trip circuit, and the leakage detection / trip circuit is connected to a leakage trip / leakage display device.

  In the circuit breaker having such a configuration, when an overcurrent is applied to the main circuit, the overcurrent relay unit operates according to the set overcurrent operation characteristics, and the latch of the mechanism unit is pulled off, thereby Move the movable contact point to open the main circuit immediately.

  In addition, the leakage of the main circuit is detected from the output of the zero-phase current transformer, and the leakage detection / trip circuit operates the leakage trip / leakage display device when the leakage exceeds the set value. Let When this earth leakage tripping device operates, the mechanical output releases the latch of the mechanism, moves the movable contact base, and immediately opens the main circuit. The main circuit components, mechanism / tripping device, zero-phase current transformer, leakage detection / tripping circuit, and leakage trip / leakage display device are usually placed inside the integral body mold case and body mold cover. Housed, these cases form the shell of the device. In addition, the mechanism is provided with a handle linked to this, and this handle protrudes from the opening of the main body mold cover to the outside of the circuit breaker. By operating the handle from the outside of this circuit breaker, the main circuit is It can be opened and closed.

  The earth leakage display button of the earth leakage trip and earth leakage display device is configured to project outside the earth leakage breaker from the opening of the main body mold cover and display the occurrence of earth leakage when the earth leakage trip device operates. The earth leakage display button and the earth leakage tripping device are configured to be reset when the mechanism section is reset in conjunction with the mechanism section or the handle. Similarly, the earth leakage test button is provided outside the earth leakage breaker through the opening of the main body mold cover, and the earth leakage breaker test operation can be confirmed by operating the earth leakage test button from the outside. Yes. Thus, the leakage detection / trip circuit and the leakage trip / leakage display device are fixed to the body mold case and covered with the body mold cover. Also, the main body mold cover provided with an opening for external display of the earth leakage display button is different in the shape of the earth leakage display section from the main body mold cover for the circuit breaker of the same outer dimensions, and the main body mold cover for the earth leakage breaker is It has become a dedicated component for earth leakage circuit breakers.

  However, in the prior art described above, the following points regarding the structure of the circuit breaker have not been considered.

(1) Sharing parts of the same size external leakage breaker (ie, circuit breaker with earth leakage trip function) and wiring breaker (ie, circuit breaker without earth leakage trip function);
(2) Function addition from the circuit breaker to the earth leakage breaker;
(3) Simplification of the method of mounting internal accessory devices for earth leakage circuit breakers;
(4) Leakage detection / removal circuit of earth leakage breaker, replacement of parts such as earth leakage trip device;
(5) circuit breaker cost; and (6) circuit breaker assembly.

  Therefore, in the present invention, in view of the problems in the circuit breaker in the prior art described above, it is possible to add a function from the circuit breaker to the earth leakage breaker, and the earth leakage detection / trip circuit for configuring the earth leakage breaker Provide circuit breakers that are easy to replace internal accessory parts such as leakage trip devices, have excellent usability and ease of assembly, are low in cost, and have a structure suitable for standardization of advanced parts For the purpose.

To achieve the above object, the present invention comprises a main circuit comprising a power source side terminal, a fixed side contact, a movable side contact, a movable contact base, an overcurrent tripping relay section, a conductor, and a load side terminal, An open / close trip mechanism that pulls off the contacts of the main circuit by moving a movable contact base, an operation handle for operating the open / close and trip of the open / close trip mechanism from outside, and further, A circuit breaker that is integrally housed in the main body mold cover and the main body case, and a storage portion on both sides of the operation handle on the surface side of the main body mold cover. And the storage part is covered by an auxiliary cover provided on the main body mold cover, and the one of the storage parts has an earth leakage unit that operates by pulling out a contact due to electric leakage. Provided leakage test unit for the tripping operation by preparative and external operation, a lever of the earth leakage unit is engaged with the earth leakage display button, the leakage occurs該漏electrostatic units operate, disconnected engagement portion, the display Provided is a circuit breaker characterized in that a button protrudes to the outside and an internal accessory device can be stored in the other storage portion .

  Moreover, according to the embodiment of the present invention described in detail below, in order to achieve the above-mentioned object of the present invention:

(A) An earth leakage trip device, an earth leakage indicator, an earth leakage detection sensor, and an auxiliary cover that can be opened / closed or attached / removed from the outside on the conductor housing portion, and the auxiliary cover is opened without opening the main body mold cover. The stored item is structured to be able to be attached and fixed from the outside in an opened or detached state.

(B) A circuit detecting / tripping circuit, a circuit tripping device, and a circuit display are housed in an integrated case or the like to form a unit.

(C) A wiring portion such as a test button lead wire or a circuit alarm contact output line, which is an internal accessory device of the circuit breaker, is provided in the circuit detection / trip circuit, circuit trip device, and circuit test unit.

  That is, the present invention provides a circuit breaker that is simple in structure, small in size, inexpensive, and easy to assemble.

According to the present invention, the following effects can be obtained.
(1) Shared components of the same size external leakage breaker (circuit breaker with earth leakage trip function) and wiring breaker (circuit breaker without earth leakage trip function);
(2) Possible to add functions from the circuit breaker to the earth leakage breaker;
(3) Simplification of how to attach internal circuit breakers to circuit breakers;
(4) Easy circuit replacement of circuit breaker circuit detection / trip circuit, circuit trip device, etc .;
(5) cost reduction of circuit breakers; and
(6) Improved circuit breaker assembly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 2 and FIG. 3 show the internal structure of a circuit breaker according to an embodiment of the present invention. In these FIG. 2 and FIG. 3, main power for connecting power from a power source to a load is shown. As shown in these drawings, the circuit includes a power source side terminal block 1, a fixed side contact 2, a movable side contact 3, a movable contact block 4, a flexible conductor 5, an overcurrent relay unit 8, 8,. 35, the load side terminal block 6 and the like. On the other hand, the mechanism portion 7 (indicated by a broken line in the figure) is interlocked with the movable contact base 4, and thereby the main circuit contact (the movable side contact). 3 and the movable contact base 4). Further, the handle 17 is connected to the mechanism portion 7 and is provided so as to protrude from the opening on the upper surface side of the main body mold cover 12 to the outside of the circuit breaker. Even when operated from the outside of the container, the contact of the main circuit can be opened and closed. When an overcurrent is applied to the main circuit, the overcurrent relay units 8, 8... Operate according to the set overcurrent operating characteristics, and the latch mechanism of the mechanism unit 7 is pulled off. Thus, the movable contact base 4 is moved to immediately open the main circuit.

  The components of the main circuit, the mechanism, and the handle 17 are housed in a space formed inside the main body mold case 10 and the main body mold cover 12, as is apparent from the figure. The main body mold case 10 and the main body mold cover 12 form an outline of the circuit breaker. As apparent from the top view of the mold cover of the circuit breaker of FIG. 4 attached, an auxiliary cover 14 is provided near the mechanism portion 7 of the main body mold cover 12 and the housing portion of the conductor 35. The cover 14 is fixed on the main body mold cover 12, and thus also forms an outline of the circuit breaker.

  In the circuit breaker, although not shown, the connection between the overcurrent relay unit 8 and the load side terminal block 6 and the conductor 35 is joined by a joining screw, and the joining screw removes the main body mold cover 12. Without removing the auxiliary cover 14, the structure can be removed from the outside by tightening or loosening it. As shown in FIG. 4, a part of the main body mold cover 12 is further provided with another auxiliary cover 14 ′, and the lower side thereof is also attached to FIGS. 5 and 1. As shown, a storage space 200 is provided so that the leakage detecting / tripping element 100 can be stored even after the circuit breaker is installed. That is, FIGS. 5 and 1 show a state where the leakage detection / removal element 100 is housed and attached in the housing space 200 of the circuit breaker, and is also shown in FIG. As described above, a zero-phase current transformer (ZCT) 9 which is a leakage detection sensor and its through conductor are installed so that the main circuit of each pole penetrates. The zero-phase current transformer (ZCT) 9 is connected to an earth leakage detection / drawing circuit 11, and the earth leakage detection / drawing circuit 11 includes an earth leakage tripping device 13 and an earth leakage test unit 20. The earth leakage tripping device 13 is connected to the earth leakage indicator 15.

  In the circuit breaker whose configuration has been described above, when an overcurrent flows through the main circuit, the overcurrent relay unit 8 operates according to the set overcurrent operating characteristics, and the latch of the mechanism unit 7 Pull off the mechanism. Thereby, this mechanism part 7 moves the said movable contact stand 4, and opens the said main circuit. On the other hand, the leakage of the main circuit is detected by the output of the zero-phase current transformer (ZCT) 9. Then, when the detected signal causes a leakage of a current exceeding the set value, the leakage detection / drawing circuit 11 operates the leakage tripping device 13. That is, when this leakage trip device 13 operates, its mechanical output releases the latch mechanism of the mechanism section 7 and moves the movable contact base 4 to immediately open the main circuit.

  The earth leakage indicator 15 operates in conjunction with the earth leakage tripping device 13. When the earth leakage operation is performed, a history of tripping of the main circuit due to earth leakage is displayed outside, and the earth leakage It is reset by the reset operation of the handle 17 or the mechanism unit 7 together with the removing device 13. Further, the leakage test unit 20 operates the leakage trip device 13 by operating from the outside.

  The main circuit components, the mechanism, the trip device, and the zero-phase current transformer (ZCT) 9 are housed in the main body mold case 10 and the main body mold cover 12 as described above. Has been. Further, a handle 17 linked to the mechanism portion 7 projects outward from an opening formed in a substantially central portion of the upper surface of the main body mold cover 12, and the main circuit can be opened and closed by operating the handle 17. Of course, it is like this. The earth leakage detection / drawing circuit 11, the earth leakage tripping device 13, the earth leakage indicator 15, and the earth leakage test unit 20 are provided on a part of the main body mold cover 12, that is, the auxiliary covers 14, 14 Thus, it is stored in a storage space 200 formed in the main body mold cover 12.

  The auxiliary cover 14 ′ is provided outside the space 200 for storing the main body mold cover 12, and the auxiliary cover 14 ′ is fixed to the main body mold cover 12 and surrounds the outer periphery of the circuit breaker. It is composed. In addition, an opening is provided in a part of the auxiliary cover 14 ', and the operation unit of the leakage test unit 20 and the display unit of the leakage indicator 15 are in contact with the outline of the circuit breaker through the opening. ing.

Next, FIGS. 6 to 11 show details of the leakage detecting / drawing circuit 11, the leakage tripping device 13, the leakage indicator 15, and the leakage test unit.
In the vicinity of the earth leakage tripping device 13, a lever 21 for transmitting a mechanical output to the mechanism unit 7 and a spring 22 for generating a mechanical output are provided. The lever 21 is engaged with an earth leakage display button 18 that indicates to the outside that the main circuit has been opened due to the occurrence of earth leakage. The earth leakage display button 18 has a force that protrudes to the outside by the earth leakage display spring 23. It has been added. Further, a reset lever 24 and a reset spring 25 are interlocked with the earth leakage display button 18 for resetting the earth leakage display button 18 by resetting the mechanism section 7.

  These components are housed in the auxiliary case 28 also shown in FIG. 7, thereby constituting an integral leakage unit. This earth leakage unit is fixed by the main body mold cover 12 and the auxiliary cover 14 '.

  The operation of the leakage unit includes a reset state and an operation state. In the reset state, the leakage display button 18 is engaged with the lever 21, while the leakage trip device 13 operates. When the lever 21 is operated, the engaging portion is disengaged, and the earth leakage display button 18 is projected to the outside by the force stored in the earth leakage display spring 23.

  On the other hand, the hook 26 which is a component of the mechanism unit 7 rotates only when the mechanism unit 7 performs the tripping operation, and the leakage tripping device 13 operates and the mechanism unit 7 performs the tripping operation. Then, the reset lever 24 is pushed up via a hook lever 27 attached to the hook 26. That is, in the reset state, the reset lever 24 presses the leakage display button 18 with a force larger than the force of the leakage display spring 23 by the force of the reset spring 25 so as not to protrude.

  Further, when the handle 17 of the circuit breaker is reset, the hook 26 rotates together with the operation of the handle 17, and the reset lever 24 pushed up by the hook lever 27 is returned by the force of the reset spring 25, and the leakage indicator button 18 To reset. Furthermore, immediately after the operation of the earth leakage tripping device 13, the mechanism portion 7 performs the tripping operation, and the hook 26 and the hook lever 27 are rotated, thereby rotating the lever 21 in the reset direction. The lever 21 is reset.

  5 and 1 show a state in which the above-mentioned accessory device is attached to the inside of the circuit breaker. Reference numeral 30 in the figure denotes a test button lead wire, Reference numeral 31 indicates a leakage alarm contact output lead. First, the test button lead wire 30 is connected to the leakage detecting / drawing circuit 11 and is taken out of the circuit breaker from between the auxiliary cover 14 ′ and the main body mold cover 12. On the other hand, the earth leakage alarm contact output lead wire 31 is connected to the internal micro switch 29 and is taken out of the circuit breaker in the same manner as the test button lead wire 30. The micro switch 29 is interlocked with the leakage display button 18 so that the contact can be output from the outside while the leakage display button 18 protrudes to the outside.

  That is, according to the structure of the circuit breaker as described above according to the present invention, the leakage detection / drawing circuit 11, the leakage tripping device 13, the leakage indicator 15, the leakage test unit 20, etc. The above earth leakage unit can be replaced or attached by removing only the auxiliary covers 14 and 14 'from the outside of the circuit breaker without removing the main body mold cover 12, or by opening and closing the cover. Become.

FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 4 for explaining the internal structure of the circuit breaker according to the embodiment of the present invention having a leakage trip function inside. It is AA sectional drawing of FIG. 4 explaining the internal structure of the circuit breaker which becomes the embodiment of the said invention. It is a top view explaining the internal structure of the circuit breaker used as an embodiment of the above-mentioned present invention. It is a top view which shows the external appearance structure of the circuit breaker which becomes embodiment of the said invention. It is a top view which shows the state which opened the auxiliary | assistant cover of the circuit breaker of the said FIG. 4, and was equipped with the earth leakage trip function in the inside. It is a figure which shows the upper surface of the unit provided with the earth leakage trip function accommodated in the said auxiliary | assistant cover, and the CC cross section and DD cross section. It is a figure which shows the EE cross section of the unit provided with the earth leakage trip function accommodated in the auxiliary | assistant cover of the said FIG. It is a figure which shows the upper surface of the unit provided with the earth leakage trip function accommodated in the said auxiliary | assistant cover, the cross section, and the cross section of the unit provided with the earth leakage trip function. It is sectional drawing explaining operation | movement of the unit provided with the said earth-leakage trip function. Again, it is sectional drawing explaining operation | movement of the unit provided with the said earth-leakage trip function. Again, it is sectional drawing explaining operation | movement of the unit provided with the said earth-leakage trip function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply side terminal block 2 Fixed side contact 3 Movable side contact 4 Movable contact block 5 Flexible conductor 6 Load side terminal block 7 Mechanism part 8 Overcurrent relay part 9 Zero phase current transformer (ZCT)
DESCRIPTION OF SYMBOLS 10 Main body mold case 11 Leakage detection / trip circuit 12 Main body mold cover 13 Leakage tripping device 14 Auxiliary cover 15 Leakage indicator 17 Handle 18 Leakage display button 20 Leakage test part 21 Lever 22 Spring 23 Leakage display spring 24 Reset lever 25 Reset Spring 26 Hook 27 Hook lever 28 Auxiliary case 29 Micro switch 30 Test button lead wire 31 Earth leakage alarm contact output lead wire 100 Earth leakage detection / removal element 200 Storage space

Claims (1)

A main circuit composed of a power supply side terminal, a fixed side contact, a movable side contact, a movable contact base, an overcurrent tripping relay section, a conductor, and a load side terminal;
An open / close trip mechanism that pulls off the contact of the main circuit by moving the movable contact base;
An operation handle for operating the opening / closing and tripping of the opening / closing trip mechanism from the outside;
Furthermore, a leakage detection means for detecting leakage of the main circuit,
With
In the circuit breaker in which these are integrally stored in the main body mold cover and the main body case,
On the surface side of the main body mold cover, storage portions are provided on both sides of the operation handle,
The storage portion is covered by an auxiliary cover provided on the main body mold cover,
In addition, the one storage portion is provided with a leakage current unit that pulls out a contact due to a leakage and a leakage test portion that performs a separation operation by an external operation .
Engage the lever of the earth leakage unit with the earth leakage display button,
When the leakage occurs and the leakage unit operates, the engaging part is released, and the display button is projected outside.
A circuit breaker characterized in that an internal accessory device can be accommodated in the other accommodating portion .

Images