JP2007335275A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker reducing the possibility of causing an electric shock accident by mistake by holding the trip state, securing a storage space of an inner attachment device by providing a function to prevent opening/closing of an ACC cover in the ON state, and having a high degree of design freedom. <P>SOLUTION: The circuit breaker is provided with a contact part having a movable contactor 13 and a fixed contactor 12, an arc suppressing chamber 15 for storing the contact part, an opening/closing mechanism part 16 for opening/closing the movable contactor 13, and an excess current tripping part 17 for detecting excess current of a main circuit and opening the movable contactor 13. An accessory cover 20 mounted with a cam member 22 is provided in a rotating shaft, and the opening/closing mechanism part 16 has a communication plate having a latch formed thereon. When the accessory cover 20 is opened by rotation, the cam member 22 is rotated and abuts on the communication plate so as to transfer to the state to remove the latch, and the movable contactor 13 is opened so as to forcedly transfer to the trip state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a circuit breaker, and more particularly, to a circuit breaker that can safely attach and detach an internal accessory device on the user side, secure a large storage space for the internal accessory device, and improve design flexibility.

In recent years, there has been an increase in the number of circuit breakers that can attach and detach internal accessory devices by opening an accessory cover (hereinafter referred to as “ACC cover”) without removing the main cover of the circuit breaker. These circuit breakers enable the user to install an internal accessory device on the user side, and have the advantage of being able to respond to an emergency by the user even when installed on a switchboard or the like.
Japanese Patent Laid-Open No. 10-188770 JP-A-6-111704

  In the conventional ACC cover structure, it is possible to open and close the ACC cover regardless of the use state of the circuit breaker, and it is possible to attempt to attach the internal accessory device in any scene. Basically, it is stipulated that the internal accessory is attached / detached in the trip state from the viewpoint of equipment damage and safety, but at present, it depends largely on the judgment of the operator.

  In order to solve these problems, in Patent Document 1, in the circuit breaker ON state, the shape of the ACC cover set screw added to the left and right of the handle part is removed to remove the ACC cover set screw in the circuit breaker ON state. A structure is disclosed in which it is impossible and consequently the ACC cover cannot be removed. The problem with this structure is that by adding a shape that covers the ACC cover set screw part, the storage space of the internal accessory device is reduced, and the design freedom and function (number of contacts, tripping coil space of the internal accessory device) are reduced. There has been a problem such as a reduction in the wide range of coil ratings due to the decrease.

In order to solve the above problems, the present invention adds the following structure (1) or (2).
(1) When trying to open the ACC cover when the circuit breaker is ON, the circuit breaker is forced by pushing the interlocking plate of the opening / closing mechanism and releasing the latch of the opening / closing mechanism due to the shape added to the ACC cover Provide a tripping function.
(2) When attempting to open the ACC cover in the circuit breaker ON state, the ACC cover and the handle interfere with each other so that the ACC cover cannot be opened.

  That is, the present invention relates to a contact portion having a movable contact and a stationary contact for opening and closing a main circuit, an arc extinguishing chamber that houses the contact portion, and an opening and closing mechanism portion for opening and closing the movable contact. A circuit breaker including an overcurrent tripping portion that detects an overcurrent of the main circuit and opens the movable contact, and includes an accessory cover having a cam member attached to a rotating shaft, When the accessory cover is opened by a rotational motion, the cam member rotates in accordance with the rotation of the rotating shaft and comes into contact with the interlocking plate of the opening / closing mechanism section. This is a circuit breaker that maintains the state of removing the contact, opens the movable contact, and forcibly shifts to the trip state.

  In addition, the present invention provides a contact portion including a movable contact and a fixed contact for opening and closing a main circuit, an arc extinguishing chamber for housing the contact, and an opening and closing mechanism for opening and closing the movable contact. And a circuit breaker having an overcurrent tripping portion that detects an overcurrent of the main circuit and opens the movable contact, and opens and closes the contact, and the position is changed between the main circuit ON state and the OFF state. The circuit breaker includes a handle to be changed, and even if the accessory cover is opened when the main circuit is ON, the accessory cover comes into contact with the handle and cannot be opened.

  According to the present invention, when attaching / detaching the internal accessory device, it becomes possible to secure a large storage space for the internal accessory device while preventing the equipment from being damaged and preventing an electric shock, Easy to improve functions.

The best mode for carrying out the present invention will be described.
An embodiment of a circuit breaker according to the present invention will be described with reference to the drawings.

  Example 1 will be described. Hereinafter, a present Example is described using FIGS. FIG. 1 is a diagram showing the structure of the circuit breaker of this embodiment. The circuit breaker according to the present embodiment includes a fixed contact base 11, a fixed contact 12 joined thereto, a movable contact 13 disposed at a position facing the fixed contact base 11, a movable contact base 14 that supports the fixed contact base 11, and a current contact. An arc extinguishing device 15 for extinguishing an arc generated between the contacts, an opening / closing mechanism 16 for driving the movable contact base 14 to open / close an electric current, and driving the opening / closing mechanism 16 when an overcurrent flows to open the contact The ACC cover 20, which is composed of a tripping device 17 that is attached to the surface of the main body cover 19 of the circuit breaker, is rotated and opened around the hinge portion 21, and the internal accessory device is inserted into the concave portion provided in the main body cover 19. Can be installed.

  By attaching the internal accessory device to the circuit breaker of this embodiment, the lever of the internal accessory device can be operated in conjunction with the operation of the opening / closing mechanism 16 to turn on / off the micro switch inside, and an electrical signal Can be added to the outside.

  The operation principle of the circuit breaker according to the present embodiment will be described with reference to FIG. By rotating and opening the ACC cover 19 in the direction 2a, the cam member 22 provided on the rotating shaft and the interlocking plate 17 forming the latch come into contact with each other, and the latch is released in the state rotated in the direction 2b. Set the circuit breaker to the trip state.

  This structure protects the operator from disasters such as electric shock and protects the work safety when installing the internal auxiliary device or performing maintenance and inspection of the circuit breaker without reducing the storage space of the internal auxiliary device. Can be improved. FIGS. 3A and 3B are enlarged views of the tripping device. Since the cam member 22 maintains the state in which the communication plate is in contact, the trip state is maintained.

  A second embodiment will be described. The circuit breaker of the present embodiment will be described with reference to FIG. In this embodiment, when the circuit breaker is in an ON state, the handle 18 for opening / closing the contact and the ACC cover 19 come into contact with each other at a point 4a, thereby making the opening operation of the ACC cover 19 impossible. . With this structure, even if the ACC cover 19 is opened during energization, the opening operation cannot be performed, so that it is possible to eliminate the risk of accidental electric shock.

  As described above, according to the embodiments of the present invention, a circuit breaker that reduces the possibility of electric shock, product breakage, etc. while providing an easy-to-use circuit breaker in which the internal accessory device is removable on the user side. Can be a container.

1 is a structural diagram of a circuit breaker according to Embodiment 1. FIG. The operation principle figure in the circuit breaker of Example 1. FIG. The trip function expansion figure in the circuit breaker of Example 1. FIG. The engagement figure of the ACC cover and handle | steering-wheel of the circuit breaker of Example 2. FIG.

Explanation of symbols

11: fixed contact base, 12: fixed contact, 13: movable contact, 14: movable contact base, 15: arc extinguishing device, 16: switching mechanism, 17: tripping device, 18: handle, 19: cover, 20: ACC Cover, 21: Hinge part, 22: Cam member, 2a: ACC cover opening direction, 2b: ACC cover shaft rotation direction, 2c: Tripping device operation direction, 2d: Opening direction force, 4a: ACC cover And handle engagement point

Claims (2)

A contact portion having a movable contact and a fixed contact for opening and closing the main circuit, an arc extinguishing chamber for storing the contact portion, an opening and closing mechanism for opening and closing the movable contact, and an overload of the main circuit In a circuit breaker provided with an overcurrent tripping part that detects current and opens the movable contact,
An accessory cover with a cam member attached to the rotating shaft
The opening / closing mechanism has a communication plate formed with a latch,
When the accessory cover is opened by a rotational motion, the cam member rotates in accordance with the rotation of the rotation shaft and abuts on the interlocking plate of the opening / closing mechanism to hold the latch, and the movable contact A circuit breaker characterized by opening and forcibly shifting to a trip state. A contact portion having a movable contact and a fixed contact for opening and closing the main circuit, an arc extinguishing chamber for storing the contact portion, an opening and closing mechanism for opening and closing the movable contact, and an overload of the main circuit In a circuit breaker provided with an overcurrent tripping part that detects current and opens the movable contact,
It is equipped with a handle that opens and closes contacts and whose position changes when the main circuit is on and off.
Even if the accessory cover is opened when the main circuit is ON, the accessory cover contacts the handle and cannot be opened.

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