JPH04136842U - circuit breaker - Google Patents

Abstract

(57) [Summary] [Objective] To provide a circuit breaker that protects an opening spring for moving a movable contact upward from an arc generated when a circuit is interrupted, and has a means for preventing poor insulation between the same poles. [Structure] An arc barrier 6 made of an insulating material is provided vertically on the lower surface of the movable contact 3 and has a barrier portion 6a facing the front surface of the opening spring 5 and a spring support portion 6b. Isolate the spring 5 from the arc.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention protects the opening spring for the upper movement of the movable contact from the arc that occurs when the circuit is interrupted. This invention relates to a circuit breaker equipped with an arc shielding device.

0002

[Conventional technology]

A conventional circuit breaker has a power switch on the outside of a fixed contact 51 and a movable contact 52, as shown in Figure 3. Although the arc device 53 is provided, the fixed contact 51, the movable contact 52, and the movable contact 54 are No means for shielding the arc is provided between the opening spring 55 for moving the pole and the opening spring 55. It was common that it was not (for example, see Utility Model Application Publication No. 114645/1983). Therefore, with conventional products, arcing that occurs when large currents are interrupted due to short circuits, etc. As a result, the opening spring 55 may be damaged. Also, base 50 by arc gas Carbon adheres to the base 50, and even in the open state, the carbon etc. attached to the base 50 and the open contact state Electricity flows between the fixed contact 51 and the movable contact 54 via the screw 55, ensuring insulation between the same poles. There was also the problem of not being able to do so.

0003

[Problem that the idea aims to solve]

This invention solves the above-mentioned conventional problems and prevents the opening spring caused by the arc during opening. In addition to preventing damage to the It was completed to provide a circuit breaker that can

0004

[Means to solve the problem]

The above problem is caused by the elastic force of the opening spring placed between the movable contact and the base. , in a circuit breaker that moves the movable contact upward to break the circuit, the movable contact The barrier part facing the front of the opening spring on the lower surface of the child and the spring that supports the upper end of the opening spring. A circuit interrupter characterized by having a vertical arc barrier made of an insulating material provided with a supporting part. This can be solved by disconnecting the device.

[0005]

【Example】

Next, embodiments of the present invention will be described in detail based on the drawings. In FIGS. 1 and 2, 1 is the base of the circuit breaker, and the top surface of the bottom of the base 1 A fixed contact 2 is provided. 3 is a movable contact facing above the fixed contact 2 4 at the tip, and the movable contact 3 is disposed between the base 1 and the base 1. The opening spring 5 is biased upward. 6 is generated when the opening spring 5 is cut off. Insulating material is installed vertically on the bottom surface of the movable contact 3 to protect it from the arc generated. It is an arc barrier. The arc barrier 6 is a mounting mounted on the lower surface of the movable contact 3. A barrier part 6a hanging down from the attached plate part 7 is provided in the center, and this barrier part 6a serves as an opening spring. It is designed to face the front of 5. Also, the area adjacent to the barrier part 6a of this mounting plate part 7 is A spring support part 6b is provided at the position where the spring support part 6b has a structure that supports the upper end of the opening spring 5. It becomes.

[0006] In addition, 9 indicates that the movable contact 4 of the movable contact 3 separated from the fixed contact 2 and broke the circuit. 10 is a cross that activates the movable contact 3. bar, and the crossbar 10 is in the state where the operating handle 11 is on, as shown in FIG. is pressed downward to position the movable contact 3 downward against the elastic force of the opening spring 5. The fixed contact 2 and the movable contact 4 are brought into close contact, and the operating handle 11 is in the off state. When the circuit is tripped or too much current flows through the circuit, remove the operating handle. The downward pressure of the handle 11 is released and the movable contact 3 is pushed by the elastic force of the opening spring 5. The movable contact 4 and the fixed contact 2 are opened.

[0007]

[Effect]

A device configured in this way will malfunction if an excessive current flows through the circuit due to a short circuit, etc. The current detector 12 activates the tripping device 13 and the downward pressure on the crossbar 10 is released. Then, the movable contact 3 moves upward due to the elastic force of the opening spring 5, and the movable contact 4 and the fixed contact Opening 2 to break the circuit is similar to a conventional circuit breaker.

[0008] However, in the device according to the present invention, the lower surface of the movable contact 3 faces the front surface of the opening spring 5. Since the arc barrier 6 made of insulating material is installed vertically, the movement of the movable contact 3 is prevented. Even if an arc occurs between the contact 4 and the fixed contact 2, the arc 21 is blocked by the arc barrier 6. It will not be shielded and will not reach the opening spring 5, and the opening spring 5 will not be damaged. It is.

[0009] Further, the arc barrier 6 made of an insulating material has a horizontal mounting plate 7 connected to the upper end. It is attached to the lower surface of the movable contactor 3, and the opening spring 5 is attached to the spring of the mounting plate part 7. Since it is in contact with the movable contact 3 via the support part 6b, arcing occurs at the same time. Carbon etc. adhere to the surface of the base 1 due to the arc gas, and the fixed contact 4 and the opening spring Even if the insulation performance between the opening spring 5 and the movable contact 3 deteriorates, the opening spring 5 and the movable contact 3 are made of an insulating material. It is insulated by the mounting plate section 7. Therefore, the insulation between the movable contact 3 and the fixed contact 4 is can be secured.

0010

[Effect of the idea]

As explained above, the present invention has the lower surface of the movable contact facing the front of the opening spring. Due to the vertical installation of an arc barrier made of insulating material, this occurs when a large current is interrupted. The arc does not reach the opening spring, and there is no risk of damaging the opening spring. others Therefore, the elastic force of the opening spring is not impaired, and the carbon caused by arc gas is The insulation performance does not deteriorate even if such adhesion occurs, and the circuit can be cut off accurately. It is. Therefore, the present invention solves the problems of conventional circuit breakers of this type. The practical value of this is extremely great.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing essential parts of an embodiment of the present invention.

FIG. 3 is a partially cutaway side view showing essential parts of a conventional example.

[Explanation of symbols]

1 base 3 Movable contact 5 Opening spring 6 Arc barrier 6a Barrier section 6b Spring support part

Claims (1)

[Scope of utility model registration request] [Claim 1] The movable contact (3) is opened by the elastic force of the opening spring (5) disposed between the movable contact (3) and the base (1).
In a circuit breaker that moves up to break the circuit, the barrier part (6a) facing the front of the opening spring (5) on the lower surface of the movable contact (3) and the upper end of the opening spring (5) A circuit breaker characterized in that an arc barrier (6) made of an insulating material is provided with a spring support part (6b) for supporting the arc barrier (6).