JP4450373B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker equipped with a voltage trip device or an undervoltage trip device which is an accessory device.

  A circuit breaker in which a concave housing portion is formed on the surface of the cover of the circuit breaker case can be attached with an auxiliary device such as a voltage trip device or an undervoltage trip device. The voltage trip device operates by applying a voltage by remote operation, and operates the switching mechanism of the circuit breaker to cut off the main circuit. The undervoltage trip device is used for the main circuit. It operates when the voltage falls below a predetermined voltage and operates the switching mechanism of the circuit breaker to shut off the main circuit. These auxiliary devices need to be reset after operation. There is a method of resetting by operating the operation handle of the circuit breaker. In this method, since the operation handle and the reset part of the attached device are directly engaged, the storage part has an opening formed on the operation handle side. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2003-151424 (p. 7, FIG. 9)

  For this reason, in the conventional circuit breaker, there is a risk that foreign matter such as dust and dust collected on the lid when the lid of the housing is opened enters the inside of the circuit breaker from the opening of the housing. There is a possibility that the circuit breaker may break down due to foreign matter.

  According to the present invention, the circuit breaker case is constituted by the cover and the base, and the cassette type voltage trip device or the undervoltage trip device is attached to the storage portion formed in the cover. In the circuit breaker that resets the voltage trip device or the undervoltage trip device by operating the operation handle that protrudes from the cover to open and close the electric circuit, the circuit breaker communicates from the inside of the storage portion to the operation handle side. The opening closes a reset member having a first locking portion locked to the operation handle and a second locking portion locked to the reset portion of the voltage trip device or the undervoltage trip device. In this way, a voltage trip device or an undervoltage trip device is provided via a reset member when a reset operation is performed by the operation handle. Characterized in that so as to set.

  According to a second aspect of the present invention, in the circuit breaker according to the first aspect, a part of the double wall for insulating between the poles suspended from the back surface of the cover is cut out, and the double The reset member is provided between both walls.

  According to the circuit breaker according to claim 1, the cover and the base constitute a circuit breaker case, and a cassette type voltage tripping device or an undervoltage tripping device is attached to a storage portion formed in the cover, In a circuit breaker that resets a voltage trip device or an undervoltage trip device by operating an operation handle that protrudes from the cover to open and close an electric circuit, an opening that communicates from the inside of the housing to the operation handle side Further, the opening portion closes the reset member having the first locking portion locked to the operation handle and the second locking portion locked to the reset portion of the voltage trip device or the undervoltage trip device. Provided so as to be slidable in the operation direction of the operation handle, when resetting is performed by the operation handle, the voltage tripping device or the undervoltage tripping device is reset via the reset member. By which is adapted to preparative prevents entry of foreign objects into the circuit breaker from an opening portion of the storage portion, there is an effect that it is possible to prevent failure of the circuit breaker according to ingress of the foreign matter.

  According to invention of Claim 2, in the circuit breaker of Claim 1, a part of double wall for insulating between the poles suspended by the back surface of the cover is notched, and double wall By providing the reset member between the two walls, there is an effect that the reset member can be attached using the shape of the cover of the circuit breaker.

  The circuit breaker prevents the entry of foreign matter into the circuit breaker by closing the opening communicating with the operation handle from the inside of the cover housing portion with a reset member. The reset member is slidably provided in the operation direction of the operation handle, the first locking portion is locked to the operation handle, the second locking portion is locked to the reset portion of the accessory device, and the operation handle is reset. By doing so, the attached device is reset via the reset member.

  A circuit breaker according to a first embodiment of the present invention will be described with reference to the accompanying drawings of FIGS.

  In the circuit breaker, a base (not shown) formed of an insulating material and a cover 1 constitute a circuit breaker case, and an auxiliary device 2 such as a voltage trip device or an undervoltage trip device is formed on the surface of the cover 1. A concave storage portion 3 for storing the storage portion 3 is formed, and a lid 4 for closing the storage portion 3 is provided on the front surface of the storage portion 3 so as to be openable and closable. Further, the cover 1 is provided with an operation handle 5 for opening and closing the electric circuit so as to protrude from a substantially central portion.

  The cover 1 is formed with an opening 6 that communicates with the operation handle 5 from the inside of the housing 3, and a reset member 7 is provided in the opening 6. The reset member 7 is plate-shaped, and a convex first locking portion 7 a that locks to the operation handle 5 is formed on one surface, and a concave second locking that locks to the reset portion 2 a of the attachment device 2. The part 7b is formed by notching one end edge in the longitudinal direction.

  Double walls 8 and 9 are provided vertically on the back surface of the cover 1 to insulate the electrodes from each other. Since this circuit breaker has three poles, it is formed in two places. Among these, the double wall 8 on the storage unit side is formed such that one wall 8 a is continuous with the storage unit 3. That is, the opening 6 of the storage part 3 is formed in one wall 8a. In addition, an opening 10 is formed in the other wall 8b of the double wall 8 so as to be communicated from the opening 6 of the storage portion 3 to the operation handle 5 side. The opening 10 is formed to be stepped in the depth direction from the opening 6 of the storage unit 3.

  The reset member 7 has a first locking portion 7a on the operation handle 5 side and a second locking portion 7b on the surface side of the cover 1 between the walls 8a and 8b of the double wall 8. And is slidably attached in the operation direction of the operation handle 5. Thus, the second locking portion 7 b is located at the opening 6 of the storage portion 3, and the first locking portion 7 a is positioned at the opening 10 of the other wall 8 b of the double wall 8. The part 6 is completely closed by the reset member 7. Accordingly, the first locking portion 7a is locked to the operation handle 5, and the reset member 7 slides by operating the operation handle 5. Note that the reset range of the reset member 7 is restricted by a stepped portion 7 c formed around the first locking portion 7 a contacting the edge of the opening 10.

  Engagement holes 12 and 13 for attaching the attachment device 2 are formed above and below the storage portion 3 of the cover 1, and an insertion hole 14 extending downward from the storage portion 3 is formed. The insertion hole 14 is for insertion of an L-shaped tripping piece 2b for operating an opening / closing mechanism (not shown) of the circuit breaker 1 when the attachment device 2 is operated. The same as the trip piece 2b of the attachment device 2 so that the trip piece 2b is inserted into the insertion hole 10 of the storage portion 3 and the reset portion 2a is fitted to the second locking portion 7b of the reset member 7. The engaging portion 2c formed on the surface is engaged with the engaging hole 12 on the lower side of the accommodating portion 3, and the elastic engaging portion 2d formed on the surface opposite to the engaging portion 2c is engaged with the engaging hole on the upper side of the accommodating portion 3. 13 is stored in the storage unit 3.

  In the front view of FIG. 5, the accessory device 2 is operatively set when the reset unit 2a is located on the lower side as shown by a solid line, and when it is located on the upper side as shown by a two-dot chain line. Off state after operation. Further, when the operation handle 5 is in the ON position indicated by the solid line or the trip position indicated by the two-dot chain line as shown in FIG. 6, the reset member 7 is located on the upper side, and the operation handle 5 is indicated by the solid line as shown in FIG. When in the OFF position shown or the reset position shown by the two-dot chain line, the reset member 7 is positioned on the lower side.

  Therefore, when the accessory device 2 is set to ON and the accessory device 2 is operated with the operation handle 5 being ON, the trip piece 2b is drawn into the accessory device 2 and is locked to the trip piece 2b. 1 open / close mechanism is actuated to cut off the main electric circuit. At this time, the reset unit 2a of the accessory device 2 is positioned on the upper side, and the operation handle 5 is positioned at the trip position. From here, in order to reset the attachment device 2, the operation handle 5 is pushed down with a finger until it reaches the reset position. Then, the reset member 7 moves downward in conjunction with the operation handle 5, and the reset portion 2a of the accessory device 2 is pushed down, so that it is reset. When the operation handle 5 is released, it returns to the off position by the force of a spring (not shown). Then, the operation handle 5 of the circuit breaker 1 is pushed up to the ON position to return. At this time, the notch length of the second locking portion 7b of the reset member 7 is long enough for the reset portion 2a of the attachment device 2 to be turned on / off, so that the reset portion 2a of the attachment device 2 is pushed up. And is held in the on position.

  In addition, about the shape of a reset member, a 1st latching | locking part and a 2nd latching | locking part are the shape which each latches to an operation handle and the reset part of an attachment apparatus, and are the shapes which obstruct | occlude the opening part of a storage part. For example, both the first locking portion and the second locking portion are formed in a convex shape, or the convex first locking portion is formed on one surface of the reset member and the other surface is formed. It is also possible to carry out the present invention with appropriate modifications within a range not departing from the gist of the present invention, such as forming a concave second locking portion.

  Also, with respect to the shape of the opening portion of the cover, in this embodiment, the opening portion of the storage portion and the opening portion of the other wall of the double wall are formed in a step, but the opening of the storage portion is eliminated by eliminating the double wall. For example, a groove may be formed in the vicinity of the portion to form the reset member so as to be slidable.

It is the perspective view which looked at the cover which removed the cover of the circuit breaker concerning the present invention from the surface side. It is the perspective view which looked at the cover which removed the cover of the circuit breaker concerning the present invention from the back side. It is a perspective view which shows the reset member which concerns on this invention. It is a front view of the cover which removed the cover of the circuit breaker concerning the present invention. It is a front view of the accessory which concerns on this invention. FIG. 4 is a cross-sectional view taken along line AA in FIG. 4, in which a lid and an operation handle are provided. FIG. 4 is a cross-sectional view taken along the line AA in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cover 2 Attachment apparatus 3 Storage part 5 Operation handle 6 Opening part 7 Reset member 7a 1st locking part 7b 2nd locking part 8 Double wall 10 Opening part

Claims (2)

  The cover and base constitute a circuit breaker case, and a cassette type voltage trip device or undervoltage trip device is attached to the storage part formed in the cover, protruding from the cover to open and close the circuit. In the circuit breaker that resets the voltage trip device or the undervoltage trip device by operating the provided operation handle, the operation handle is locked to the opening that communicates from the inside of the storage portion to the operation handle side. Of the operating handle so that the opening closes a reset member having a first locking portion to be engaged and a second locking portion to be locked to the reset portion of the voltage trip device or the undervoltage trip device. It is provided so as to be slidable in the operation direction, and when the reset operation is performed by the operation handle, the voltage trip device or the undervoltage trip through the reset member. Circuit breaker being characterized in that so as to reset the device off.   2. A part of a double wall for insulating between poles suspended from the back surface of the cover is cut out, and the reset member is provided between both walls of the double wall. Circuit breaker as described.

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