JPS6376215A - Circuit breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention 1 relates to a circuit breaker for breaking an electric path, particularly to an improvement in the structure of its arc-extinguishing plate.

[Prior Art] Fig. 4 shows the structure of a conventional circuit breaker near the contacts and arc extinguishing plate.A fixed contact 4 and an arc runner 5 are fixed to a stator 3 by brazing. bolt 1
2 screws the stator 3 onto a base 6 made of an insulating material, and fixes the folded end portion 31 of the stator 3. The movable element 1 is provided with a movable contact 2, and in a closed circuit state, the movable contact 2 and the fixed contact 4 are in contact with each other.

In this closed circuit state, when an overcurrent flows through the electric circuit, a tripping device (not shown) is activated to separate the movable element 1.

At this time, there is an arc 9 between the movable contact 2 and the fixed contact 11.
occurs. This arc 9 is moved in the direction of arrow A above the arc runner 5 by electromagnetic force. The moved arc is stretched out and divided by the arc extinguishing plate 10,
The arc is extinguished.

[Problems to be Solved by the Invention] However, the conventional circuit breaker has the following problems.

In order to make the arc run smoothly and improve the breaking performance, it is preferable to keep the angle of the arc extinguishing plate 10 perpendicular to the arc.The arc moves in an arc as shown in Fig. 4. Therefore, in order to satisfy the following condition, the arc-extinguishing plates 10 may be arranged radially. However, when the arc-extinguishing plates 10 are arranged radially, there is a problem in that the ends 10g of the contacts ff1ll approach each other, making re-arcing more likely to occur. Furthermore, if a sufficient distance is provided between the contact side ends 10g, the number of arc-extinguishing plates 10 will be reduced, resulting in a problem in that the cooling effect on the arc will be reduced.

An object of the present invention is to solve the above problems and provide a circuit breaker with high breaking performance.

[Means for Solving the Problems] The circuit breaker according to the present invention includes a stator, a fixed contact provided on the stator, a movable element driven by a tripping device, and a movable element provided on the movable element. It has a movable contact that comes into contact with and separates from a fixed contact by a cage movable element, and arc extinguishing plates are arranged radially so that the lengths of the end portions on the contact side are alternately different.

[Function] The lengths of the contact-side ends of the arc-extinguishing plates are arranged so that they are long and short so that they are alternately different, so even if the arc-extinguishing plates are arranged radially, the contact-side ends will be closer together than necessary. Never.

[Example〕 An embodiment of this invention is shown in FIG.

A fixed contact 4 and an arc runner 5 are fixed to the stator 3 by brazing. The bolt 12 is attached to the stator 3
1! ! While screwing onto the base 6 made of edge material,
The folded end portion 31 of the stator 3 is fixed. The movable element 1 is provided with a movable contact 2, and in a closed circuit state, the movable contact 2 and the fixed contact 1 are in contact with each other. In the upper space uu of the arc runner 5, which is an arc guiding member, arc extinguishing plates 10 are fixed by Iυ plates 11 and arranged radially. 10 is made of a magnetic material, and a notch lOa for introducing the arc is provided on the contact side.

The first contact side end 10b is short, and the second contact side end 10b is short.
c is long. As shown in FIG. 1, these arc-extinguishing plates 10 are arranged alternately on the front and back sides.

The operation of the circuit lδ breaker based on this implementation νσ will be explained with reference to FIG. When an overcurrent flows in the circuit in a closed circuit state, a trip device (not shown) is activated! [17L
The mover 1 is opened. At this time, an arc 9 is generated between the movable contact 2 and the fixed contact 4. This arc 9 is moved in the direction of arrow A above the arc runner 5 by electromagnetic force. Since the arc-extinguishing plates 10 are arranged radially, the arc intersects the arc-extinguishing plates almost perpendicularly, so there is little fluid resistance and the arc runs smoothly. Therefore, the arc is quickly stretched, broken, and extinguished.

Figure 3 (A) and (B) show details 11a of the arc-extinguishing plate in another British Mi example.0M3 [(A)? ,! l 1 (7)
The arc-extinguishing plate 60 is shown in gS3 (B), and the second arc-extinguishing plate 70 is shown in FIG. The first arc extinguishing plate 60 has its contact side end 6 (Ig
is formed long, and the second arc-extinguishing plate 70 has a contact side end 7
0g is formed short. This g4T 1 arc extinguishing plate 6
By alternately arranging 0 and the second eraser IJ board 70,
The same effects as in the previous embodiment can be obtained.

Effects of the Invention C The @ road breaker according to the present invention is configured such that a plurality of arc extinguishing plates are arranged substantially radially, and the lengths of the ends of the contacts Ill are alternately different.

Therefore, not only is there no 7' re-ignition force between the contact side ends, but also the arc travels quickly because the arc-extinguishing plate is disposed perpendicularly to the arc.

In other words, it is possible to provide a circuit breaker with high tl and breaking performance.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the main parts of a circuit breaker as an embodiment of the present invention, Fig. 2 is a plan view showing details of the arc extinguishing plate used in the circuit breaker of Fig. 1, and Fig. 3. (A) and (B) are plan views showing details of arc-extinguishing plates used in other embodiments, and FIG. 4 is a side view showing main parts of a conventional circuit breaker. 1 is a mover, 2 is a movable contact, 3 is a stator, 4 is a fixed contact, 5 is an arc runner, and IO is an arc extinguishing plate. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A stator, a fixed contact provided on the stator, a movable element driven by a tripping device, a movable contact provided on the movable element and connected to and separated from the fixed contact by the movable element, and an arc guiding means. A circuit breaker comprising: a plurality of arc extinguishing plates arranged substantially radially in the upper space and fixed to a side plate so that the lengths of the contact side ends are alternately different. (2) The plurality of arc-extinguishing plates shall consist of a first arc-extinguishing plate with a long end on the contact side and a second arc-extinguishing plate with a short end on the contact side. A circuit breaker according to claim 1, characterized in that: (3) The plurality of arc-extinguishing plates are arc-extinguishing plates in which the first contact side end is formed short and the second contact side end is formed long, and are arranged alternately on the front and back sides; A circuit breaker according to claim 1, characterized in that: