JPH0697586B2 - Auxiliary switch device for circuit breaker - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker auxiliary switch device for detecting the open / closed state of a circuit breaker such as a wiring breaker.

[Prior art]

As a device of this type, a device as shown in FIG. 5 is conventionally known. Here, FIG. 5 (A) is a horizontal sectional view and FIG. 5 (B) is a vertical sectional view. In FIG. 5, reference numeral 1 denotes an outer casing made of an insulating material, which is divided into a case 2 and a cover 3, and is an auxiliary switch (micro switch).
4 is sandwiched and held from the side. In that case,
The auxiliary switch 4 is positioned by fitting the projections 2a and 3a provided inside the case 2 and the cover 3 into the holes 4a on the side surface of the main body of the auxiliary switch 4, respectively. Reference numeral 5 is a push button provided on the upper surface of the auxiliary switch 4. Reference numeral 6 denotes an actuator, which has an operating end 6a formed at one end for contacting a part of an opening / closing mechanism of a circuit breaker (not shown), and the other end.
It is swingably supported on the upper surface of the outer box 1 by a pin 7 at 6b. Reference numeral 8 denotes a push rod guided by the outer box 1, and the operating force from the actuator 6 is transmitted to the push button 5 via the push rod 8. In the figure, push button 5 is pressed and auxiliary switch 4 is pressed.
The movable contact spring 4b is closed. Such an auxiliary switch device has a round hole in the main body case of a circuit breaker (not shown) and a cylindrical projection 1a on the side surface of the outer casing 1.
However, since the auxiliary switch 4, the actuator 6 and the push rod 8 are integrally incorporated into the outer box 1 to form a unit, the auxiliary switch is directly attached to the main body case of the circuit breaker. The attached actuator has the following advantages as compared with the structure in which the actuator is supported by the main case of the auxiliary switch or the circuit breaker. (1) It can be easily attached to and detached from the circuit breaker, and can easily cope with changes in specifications between the circuit breaker without an auxiliary switch and the circuit breaker with an auxiliary switch. (2) Since the actuator 6 is supported by the outer case 1, the standard micro switch can be used as it is as the auxiliary switch 4. (3) Since the auxiliary switch 4 is housed in the outer case 1 and then mounted on the main body case of the circuit breaker, the main body case of the circuit breaker does not require an accommodating portion for the auxiliary switch. The circuit breaker becomes small in the case of specifications without a switch.

[Problems to be Solved by the Invention]

The actuator 6 is made of a metal material so as to withstand an arc when the circuit breaker is short-circuited.
Therefore, in order to secure the insulation distance X from the actuator 6 to the movable contact spring 4b, which is a conductive portion, the actuator 6 is arranged outside the outer box 1, and an insulating material is provided between the actuator 6 and the push button 5. The push rod 8 is inserted. However, in such a conventional configuration, the total height Y of the auxiliary switch device is inevitably high, and it is difficult to reduce the size. Further, when the actuator 6 is a molded product of an insulating material, there is a problem that it is easily melted by an arc during short-circuit interruption. The present invention is a circuit breaker in which the auxiliary switch and the actuator are integrally incorporated into an outer casing of an insulator to form a unit, and the height is reduced and the size is reduced while using a metal actuator that is resistant to arc. An object is to provide a dexterous auxiliary switch device.

[Means for Solving the Problems]

In order to achieve the above object, an auxiliary switch device for a circuit breaker of the present invention is divided into an auxiliary switch having a push button on the upper surface thereof, a case and a cover, and holds the auxiliary switch by sandwiching it from the side. An outer casing of an insulator held in the main body case of the circuit breaker by fitting, and an L-shaped curved portion whose one end serves as an operating end in contact with a part of the opening / closing mechanism of the circuit breaker and which is bent upward at the other end. An L-shaped groove formed in the case and having an L-shaped groove formed in the case, the actuator being made of a metal plate that is swingably supported in the outer box; And an insulating piece fixed so as to cover the head of the push button.

[Work]

Since the actuator is supported by inserting the L curved portion into the L-shaped groove of the case, the fulcrum space of the actuator is reduced. Further, since the insulating piece covering the upper part of the auxiliary switch is provided between the actuator and the auxiliary switch, the insulating performance between the main circuit charging part and the auxiliary switch conductive part is improved, and the metal actuator is used. The necessary insulation distance can be secured even if the actuator is placed in the outer box and the actuator is brought close to the auxiliary switch.

【Example】

1 to 4 show an embodiment of the present invention.
That is, FIG. 1 (A) is a transverse sectional view of the auxiliary switch device, FIG. 1 (B) is a longitudinal sectional view of the same, FIG. 2 is an exploded perspective view of the auxiliary switch device of FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view showing a state in which the auxiliary switch device of FIG. 1 is mounted on a circuit breaker (wiring breaker), and FIG. 4 is a transverse sectional view of FIG. The same parts as those in the conventional example are designated by the same reference numerals. First, in FIG. 1 and FIG. 2, the outer box 11 of the molded resin molded product comprises a case 12 and a cover 13, and holds the auxiliary switch 4 by sandwiching it from the side. At that time, the projections 12a and 13a formed inside the case 12 and the cover 13 are fitted into the holes 4a on the side surface of the main body of the auxiliary switch 4 for positioning. The actuator 14 is formed into a shape as shown by punching a metal plate having a spring property and then bending the metal plate. One end 14a of the actuator 14 is an operating end that comes into contact with a part of the opening / closing mechanism of the circuit breaker as described later.
The other end 14b is a support end, which is an L curved portion bent upward at a right angle. Reference numeral 15 is an insulating piece of a molded resin molded product, which is formed in an inverted U shape, in which a positioning projection 15a on the upper surface is fitted into a slit 14c of an actuator 14, and a cylindrical projection 15b is inserted into a hole 14d of the actuator 14, By caulking the projection 15b, it is fixed to the lower surface of the actuator 14. The actuator 14 to which the insulating piece 15 is fixed is laterally inserted into an L-shaped groove 12b having a substantially L-shaped cross section formed in the case 12 and is swingably supported. Supporting by the combination of the L curved portion 14b and the L-shaped groove 12b requires less fulcrum space than the conventional supporting by the pin. Assembly of the actuator 14 and the auxiliary switch 4 into the outer box 11 will be described below with reference to FIG. First, the actuator 14 extends the operation end 14a from the cutout window 12c of the case 12 to the outside, and the L curved portion 14b is about half the L of the case 12.
Insert into the groove 12b. Therefore, replace the auxiliary switch 4 with the insulating piece 1.
It is inserted between the side walls 15c, 15c from below 5 and the whole is brought close to the case 12 so that the projection 12a of the case 12 and the hole 4a of the auxiliary switch 4 are fitted together. Next, cover 13 with its protrusion 13a in hole 4 of auxiliary switch 4.
Push it into Case 12 while aligning it with a. As a result, the arms 12d on both sides of the lower part of the case 12 are elastically deformed and opened to the left and right, and the gripping part 12e at the tip thereof rides over the side surface 13b of the cover 13 and falls into the recess 13c on the back surface to grip the cover 12 on the case 12. In this state, the insulating piece 15 covers the upper portion of the auxiliary switch 4, and the lower surface thereof contacts the head portion of the push button 5. In this way, by covering the upper portion of the auxiliary switch 4 with the insulating material, the insulation performance between the actuator 14 serving as the charging portion and the conductive portion 4b of the auxiliary switch 4 becomes very high, and the vertical gap is reduced. Also, the required creepage distance can be sufficiently secured. FIGS. 3 and 4 show a state in which the auxiliary switch device 10 is mounted on the circuit breaker 20. Although not described in detail, the circuit breaker 20 includes an operation handle 22, an opening / closing mechanism 24 including a movable contact 23, a fixed contact 25, an overcurrent release, and a main body case 21 made of a molded resin product. It is configured by incorporating the device 26 and the like. The drawing shows the closed state, and the movable contact 23 performs the opening / closing operation with the pin 27 as a fulcrum. The auxiliary switch device 10 is sandwiched between two main body cases 21 below the circuit breaker 20, and as shown in FIG. 4, a cylindrical protrusion 11a provided on a side surface of the outer box 11 has a main body case 2
It is fitted and held in the round hole of 1. In such a state, the operating end 14a of the actuator 14 comes into contact with the lower surface of the movable contact 23 and is operated by the opening / closing operation thereof. As is apparent from FIG. 3, the auxiliary switch device 10 has a structure in which the actuator 14 is housed in the outer box 11, so that the protrusion of the auxiliary switch device 10 into the circuit breaker 20 causes the actuator 14 to move. Only the operation end 14a is provided, and the internal space of the circuit breaker 20 is made compact. Further, since the fulcrum space of the L curved portion 14b of the actuator 14 is small and the actuator 14 can be brought close to the auxiliary switch 4 by disposing the insulating piece 15, the height of the auxiliary switch device 10 itself becomes small, The protrusion of the auxiliary switch device 10 from the lower surface of the circuit breaker 20 is also small.

【The invention's effect】

The present invention relates to an auxiliary switch in which an auxiliary switch and an actuator are integrally incorporated into an outer casing of an insulator to form a unit, and the actuator is housed in the outer casing of the auxiliary switch device and supported by an L curved portion, and the actuator and the auxiliary are supported. Since the insulating piece that covers the upper part of the auxiliary switch is arranged between the switch and the actuator and the auxiliary switch are brought close to each other, the height of the auxiliary switch device can be made smaller while using a metal actuator that is resistant to arc, and downsized. Can be planned.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 (A) is a cross sectional view of an auxiliary switch device, FIG. 1 (B) is a vertical cross sectional view, and FIG. Exploded perspective view, FIG. 3 shows the first
FIG. 4 is a longitudinal sectional view showing a state in which the auxiliary switch device shown in the figure is mounted on a circuit breaker, and FIG. 4 is a transverse sectional view of FIG. FIG. 5 shows a conventional example, and FIG. 5 (A) is a transverse sectional view,
FIG. 3B is a vertical sectional view. 4: Auxiliary switch, 5: Push button, 10: Auxiliary switch device, 1
1: Outer box, 12: Case, 13: Cover, 14: Actuator, 1
5: Insulation piece, 20: Circuit breaker.

Claims (1)

[Claims] 1. An auxiliary switch having a push button on an upper surface,
An outer casing of an insulator, which is divided into a case and a cover, holds the auxiliary switch by sandwiching it from the side and is held in the main body case of the circuit breaker by fitting, and one end of the opening / closing mechanism of the circuit breaker. It is an operating end that comes into contact with a part, and the other end is formed with an L-bent portion that is bent upward, and this L-bent portion is inserted into an L-shaped groove formed in the case and is freely swingable in the outer box. An auxiliary member for a circuit breaker, which comprises an actuator made of a metal plate supported on the actuator, and an insulating piece fixed to the lower surface of the actuator so as to cover the upper portion of the auxiliary switch and contacting the head of the push button. Switch device.