JPH06290695A - Circuit breaker - Google Patents

Abstract

PURPOSE:To enhance breaking performance and assembly by horizontally engaging a blowout core with the outside enclosure part of a slit member engaged with an opening for actuating a needle. CONSTITUTION:A slit member 19 is engaged with the opening 1 7 of a terminal board 15 from the upper part. Under this state, the enclosure part 20 of the member 19 is engaged in an opening 17 to surround a fixed contact 18. Under this state, a blowout core 24 is horizontally 27 engaged with the outside of the enclosure part 20. Under this engaged state, the core 24 at its holes 25 is locked to the locking projecting part 23 of the enclosure part 20 and is vertically controlled between positioning projections 21, being held under an electrically neutral state, no contact with the terminal board 15. Thus, easy assembly is available and AC interruption or DC interruption for high voltage is readily conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to a terminal structure having a blowout core.

[0002]

2. Description of the Related Art FIG. 10 and FIG.
It is a figure which shows the conventional circuit breaker shown by 18154 gazette. In FIG. 10, when a leakage occurs, a secondary current flows through the zero-phase current transformer 1, this is amplified by the amplifier 2 to drive the electromagnet 3, and the operating plate 3 a of the electromagnet 3 is tripped by the trip plate 4.
Is operated to open the card 6 pressing the contact spring 5, and the contact spring 5 separates from the fixed contact 7 to interrupt the circuit. In addition, even if an overcurrent occurs, the bimetal 8 connected in series with the circuit will generate heat and bend and the trip plate 4
Is operated to open the contacts in the same manner as above.

As shown in FIG. 11, a fixed contact 7 is provided at one end.
To the terminal board 10 provided with the external connection terminal 9 at the other end,
Partition plate 12a for partitioning the fixed contact part and the external connection terminal part
And a U-shaped magnetic body 12 (blow-out core), which is formed from both side ends of the partition plate 12a and covers both sides of the fixed contact portion, is provided upright.
As shown in FIG. 11A, the bending piece 12c extending from the lower edge of the partition plate 12a is provided with a long hole 13, and a rivet or a mounting screw 14 is inserted into the long hole 13 so that It is fixed to the upper surface of the terminal board 10. The external connection terminal portion and the fixed contact portion are provided on the side plate 11 of the case cover 11.
It is separated by a.

In the above structure, when an arc is generated between the contacts when the contact is opened, a part of the annular magnetic force line H formed around the arc current A is U-shaped magnetic as shown in FIG. 11 (b). In order to pass through the body 12, a force in the direction of the arrow X acts on the arc current A, the arc length is rapidly extended, and the arc is extinguished in a short time.

[0005]

In the conventional circuit breaker, the blowout core 12 is fixed to the terminal board 10 as described above, and the blowout core 12 is not electrically neutral. Runs above the blowout core 12 and the cutoff performance deteriorates.

The present invention has been made in order to solve such a problem. The blowout core is made electrically neutral to improve the breaking performance, and the terminal plate, the slit member and the blowout core are unitized. It is an object of the present invention to obtain a circuit breaker capable of improving the assembling property.

[0007]

SUMMARY OF THE INVENTION A circuit breaker according to the present invention has a side face U-turn shape, has a movable element operating opening on the turn side of the U-turn, and is fixed inside the opening. A terminal plate having a contact, a slit member made of an insulating material fitted from above into a movable element operating opening of the terminal plate and surrounding walls of at least both sides of the fixed contact, and a slit member made of the slit member. A blow-out core having a planar U-shape that is laterally fitted to the outside of the surrounding wall and is fixed by unevenness so as not to contact the terminal plate.

[0008]

In the present invention, since the slit member is fitted into the opening for moving the mover of the terminal plate from above, the blow-out core is fitted laterally outside the surrounding wall of the slit member. The plate, the slit member, and the blowout core can be assembled as a unit, and the blowout core fitted to the slit member in the assembled state is held in an electrically neutral state without touching the terminal plate.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. In the figure, 15 is a terminal plate having a U-turn shape when viewed from the side, and a mover 16 is provided on the turn side of the U-turn.
And the fixed contact 18 inside the opening 17. Reference numeral 19 denotes a slit member made of an insulating material, which is fitted in the opening 17 of the terminal plate 15 from above and surrounds the fixed contact 18 with a planar U-shaped surrounding wall portion 2.
Has 0. Reference numeral 21 denotes a pair of upper and lower positioning protrusions respectively provided on both outer surfaces of the surrounding wall portion 20, and 22 is a recess provided at an inner edge of the opening portion 17 of the terminal plate 15, and the surrounding wall portion 20 of the slit member 19 serves as the opening portion of the terminal plate 15. It serves as a guide for the positioning projection 21 when it is inserted into the top 17 from above. 23 is the wall part 2
Locking protrusions provided on the outer surfaces of both sides of 0, and 24 are blow-out cores having a U-shape in a plan view. The holes 25 on both side surfaces are locked to the locking protrusions 23 of the surrounding wall portion 20 and are attached to the surrounding wall portion 20. They are fitted together from the lateral direction, and are fitted between the positioning protrusions 21 to be fixed in an electrically neutral state in which they do not come into contact with the terminal plate 15.

From the state shown in FIG. 6, the slit member 19 is fitted into the opening 17 of the terminal plate 15 from above (in the direction of arrow 26). In the fitted state, the surrounding wall portion 20 of the slit member 19 fits into the opening 17 and surrounds the fixed contact 18 as shown in FIGS. 3 to 5. The slit member 19 in this state
The blow-out core 24 is fitted to the outside of the surrounding wall portion 20 in the lateral direction (direction of arrow 27). In the fitted state, as shown in FIGS. 3 to 5, the blow-out core 24 has the holes 25 engaged with the locking projections 23 of the surrounding wall 20 and is vertically restricted between the positioning projections 21. It is held in an electrically neutral state where it does not come into contact with the terminal board 15.

As described above, the terminal plate 15, the slit member 19, and the blowout core 24 can be easily assembled without using other parts and can be unitized as shown in FIGS. As shown in FIG. 2, it can be easily incorporated into the breaker housing 28. In the above embodiment, the surrounding wall portion 20 of the slit member 19 is formed into a U shape in plan view and the blowout core 24
Is isolated from the fixed contact 18 side, the opening distance becomes large, which is effective when AC interruption or DC interruption of high voltage is performed.

Example 2. In the above Example 1, FIG.
As shown in FIG. 9, the opening 2 is formed in the surrounding wall 20 of the slit member 19.
9 is provided, the blowout core 24 is fixed contact 1
Since it is exposed to the 8 side, the arc touches the blowout core 24 and is cooled, and the arc extinguishing performance is improved. This is particularly effective in the case of low-voltage AC interruption.

[0013]

As described above, according to the present invention, the blowout core can be electrically neutralized to improve the breaking performance, and the terminal plate, the slit member and the blowout core can be unitized to improve the assemblability. The effect that it can be improved is obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a first embodiment of the present invention.

FIG. 2 is the same view as FIG. 1 showing an off state.

FIG. 3 is a side view showing only the unit section of FIG.

FIG. 4 is a plan view of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an exploded perspective view of FIG.

FIG. 7 is a perspective view of a slit member showing a second embodiment of the present invention.

8 is a plan view showing a unit portion using the slit member of FIG. 7. FIG.

9 is a cross-sectional view taken along the line IX-IX in FIG.

FIG. 10 is a cross-sectional view showing a conventional one.

FIG. 11 is a diagram showing the blowout core of FIG. 10;

[Explanation of symbols]

 15 terminal plate 16 mover 17 opening 18 fixed contact 19 slit member 20 surrounding wall 21 positioning projection 22 recess 23 locking projection 24 blowout core 25 hole

Claims (3)

[Claims] 1. A terminal plate having a side face U-turn shape and having a movable element operating opening on the turn side of the U-turn and having a fixed contact inside the opening, and a movable element of this terminal plate. A slit member made of an insulating material, which is fitted into the operation opening from above and surrounds at least both sides of the fixed contact, and a slit member laterally fitted to the outside of the surrounding wall of the slit member. A circuit breaker, comprising: a flat U-shaped blowout core fixed by unevenness so as not to come into contact with the circuit breaker. 2. The circuit breaker according to claim 1, wherein the surrounding wall portion of the slit member has a U-shape in a plan view so that the blowout core is insulated from the fixed contact side. 3. The blowout core is exposed to the fixed contact side by forming the surrounding wall portion of the slit member into a U-shape having an opening in the middle of the U-shape.
Circuit breaker.