JPH0282425A - Circuit breaker - Google Patents

Abstract

PURPOSE:To make it possible to certainly display a working condition at a display section when a main contact section is cut off and also reduce the number of parts of a structure for display of an abnormality and the cost by forming a display section at the moving iron core of an electro-magnet and interlocking a circuit tripping mechanism to the working of the moving core of the electro-magnet at the time of leak detection. CONSTITUTION:In a circuit breaker having an electro-magnet 7 operated by an output of a current transformer, a circuit tripping mechanism 15 interlocked by an operation of the moving iron core 11 of that electro-magnet 7 and the main contact 2 opened and closed by operation of that circuit tripping mechanism 15, a display section 21 is formed at a part of the moving iron core 11, and a display window 22 opposed to that display section 21 is provided in the body case of the circuit breaker. The main contact 2 is cut off by interlocking the circuit tripping mechanism 15 to an operation of the moving iron core 11 of the electro-magnet when an abnormal condition such as leak, etc., is detected, and it is possible to confirm the operating condition at the display section 21 or a part of the moving iron core 11 which then operates. Thereby, it is possible to simplify a structure for display of an abnormality.

Description

[Detailed description of the invention] Industrial applications The present invention relates to circuit breakers.

BACKGROUND OF THE INVENTION Conventionally, circuit breakers display the operating status in the event of an abnormality such as an electrical leakage. Various display means have been devised. For example, in Japanese Utility Model Publication No. 55-491.4 and Japanese Utility Model Publication No. 55-13883, the display body is interlocked during operation due to electric leakage, and
In Japanese Patent No. 44, abnormal conditions such as electrical leakage or normal conditions are confirmed by rotating the lever and viewing these indicators or the display portion formed on the lever through the display window of the main body case.

Problems to be Solved by the Invention The indicators or levers shown in the above-mentioned publication function only to display the operating status, and these indicators and levers require a structure that is linked to the earth leakage tripping mechanism. year,
Therefore, there is a problem that the number of parts increases and the assembly work becomes complicated.

Means for solving the problem An electromagnet operated by the output of a current transformer, a circuit tripping mechanism linked to the operation of the movable core of this electromagnet, and a main contact section that is opened and closed by the operation of this circuit tripping mechanism. In the circuit breaker, a display part is formed in a part of the movable core, and a display window facing the display part is formed in the main body case of the circuit breaker.

When an abnormal condition such as an action leakage is detected, the main contact section is cut off by interlocking the circuit tripping mechanism with the operation of the movable core of the electromagnet, but the operating status can be indicated using the display part that is part of the movable core that operates at this time. This allows the structure for abnormality display to be simplified.

Example An embodiment of the present invention will be described based on the drawings.

Reference numeral 1 denotes a main body case, only a portion of which is shown, and a main contact portion 2 connected to a power supply circuit is provided inside the main body case 1. This main contact part 2 includes a contact 4 fixed to a terminal board 3 and a contact arm 5 biased upward.
The contact 6 is held at the tip of the contact 4 and is in contact with the contact 4. Further, the electromagnet 7 is attached to the frame 8 in the main body case 1.
is held through. The electromagnet 7 includes a trip coil 9 and a plate-shaped movable core 11 facing the magnetic pole 9510 of the trip coil 9.
is rotatably held by the frame 8 by a support/shaft 12, and a spring (not shown) is wound around this support shaft 12 to bias the movable iron core 11 in a direction away from the magnetic pole part 10. . Further, an opening/closing plate 13 is held in the main body case 1 so as to be movable up and down, and an opening 14 through which the contact arm 5 passes is formed in the opening/closing plate 13. Further, the main body case 1 is provided with a circuit tripping mechanism 15. This circuit tripping mechanism 15 includes a handle 17 rotatably held by a support shaft 16, and a link mechanism (not shown) that rotates the opening/closing plate 13 in the vertical direction by the rotational movement of the handle 17. It becomes more. moreover,
A latch 19 facing the tip of a pressing rod 18 fixed to the movable iron core 11 is biased counterclockwise and rotatably held by a support shaft 20. This latch 19 rotates clockwise against the urging force when pressed by the pressing rod 18 of the movable iron core 11, and in conjunction with the operation of the latch 19 at this time, the opening/closing plate 13 is moved upwardly. An interlocking mechanism (not shown) is provided to allow movement.

A display section 21 is formed at the tip of the movable iron core 11, and a display section 21 is formed on a part of the main body case 1 when the movable iron core 11 is attracted to the magnetic pole section 10 of the trip coil 9.
A display window 22 facing 1 is formed. This display window 22 is formed by forming a hole in the main body case 1 and fitting a transparent cover into the hole.

In such a configuration, FIG. 1 shows a normal operating state in which the handle 17 is located at position A and the main contact portion 2 is maintained in a closed circuit. From this state, as shown in FIG. 2, when the handle 17 is rotated to position B, the link mechanism is linked to the operation of the handle 17, so the opening/closing plate 13 moves upward, and the contact arm 5 is displaced upward. However, the main contact portion 2 is maintained in an open circuit. At this time, the movable core 1 of the electromagnet 7 does not operate, so the display section 21 of the movable core 11 is displayed on the display window 22.
Do not confront.

When a current transformer (not shown) detects an abnormality such as electric leakage in the normal operating condition shown in FIG. 1, the detection signal excites the trip coil 9 for a certain period of time, and the movable iron core 11 Magnetic pole @ lll O against the biasing force
, and the latch 19 is pressed by the pressing rod 18 at the maximum displacement operation at the time of suction, as shown by the imaginary line. The pressed latch 19 rotates clockwise l\ around the support shaft, interlocks the interlocking mechanism, and opens the opening/closing plate 13. As a result, the contact arm 5 operates while pressing the opening/closing plate 13 by force, and the main contact portion 2 is interrupted. Movable iron core 11
is returned counterclockwise using the support shaft 12 as a fulcrum due to the biasing force, but comes into contact with the raised opening/closing plate 13 and stops at the position shown by the solid line in FIG. In this state, the display section 21 faces the display window 22. Therefore, by looking at the display section 21 through the display window 22, abnormal conditions such as electrical leakage can be confirmed. When the abnormality has been treated and the handle 17 is returned to position A from the state shown in FIG. is returned counterclockwise by the biasing force as shown in FIG. 1, and the display section 21 is removed from the position facing the front window 22.

As described above, since the abnormal state can be confirmed using the display section 21 which operates when an abnormality occurs such as B electric current and which is a part of the movable core 11 of the electromagnet 9, the structure for indicating the earth leakage can be simplified. Can be done.

In the above embodiment, the state in which the display section 21 does not face the display window 22 is determined to be a normal state; however, two display sections are formed on the movable core 11 to display an abnormal state and a normal state, and these The display sections may be alternately opposed to the display windows 22.

Effects of the Invention As described above, the present invention has a display part formed on the movable core of the electromagnet, which is a component of a circuit breaker, so that the circuit tripping mechanism can be linked to the operation of the movable core of the electromagnet when detecting an earth leakage. Therefore, when the main contact part is cut off, the operating status can be reliably displayed using a display part that becomes a part of the movable core, and the number of structural parts for abnormality display can be reduced to reduce costs. It has the effect of

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view showing a normal state, FIG. 2 is a side view showing a state in which the main contact part is cut off in a normal state, and FIG. 3 is a side view showing an abnormal state. FIG. ■...Body case, 2...Main contact portion, 7...Electromagnet, 1]...Movable iron core,]5...Circuit tripping mechanism,
21...Display section, 22...Display window

Claims (1)

[Claims] A circuit breaker having an electromagnet operated by the output of a current transformer, a circuit tripping mechanism interlocked with the operation of a movable iron core of the electromagnet, and a main contact portion opened and closed by the operation of the circuit tripping mechanism. A circuit breaker, characterized in that a display section is formed in a part of the movable iron core, and a display window facing the display section is formed in the main body case of the circuit breaker.