JPH1040800A - Leakage display unit of leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized, compact leakage display unit incorporated in a leakage breaker capable of a stable display operation and reducing the number of parts. SOLUTION: A leakage display unit 9 is constituted by integrally assembling a printed circuit board 11 mounting a unit case 10 on a base body and a leakage detection circuit, a trip coil 6 formed as a plunger solenoid mounted on a back face side of the printed circuit board 11 and connected to the leakage detection circuit, a leakage display button 3 directly coupled with a movable iron core 6a of the trip coil 6 and penetrating the printed circuit board 11 and an armature 8 as a trip actuator, and a lock holding mechanism 12 for holding the leakage display button 3 at a protrusion position, and an end face of the button 3 is seen on a button hole 1a opened in a breaker case and assembled in the breaker. Thus, a latch mechanism for linking the trip coil 6 and the leakage display button 3 and an energizing spring is eliminated, the number of parts is reduced, and the unit can be miniaturized and compactly constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage display unit incorporated in a case of an earth leakage breaker.

[0002]

2. Description of the Related Art The earth leakage breaker described above is designed to display an earth leakage by projecting an earth leakage display button forward from a case in conjunction with a trip operation for detecting the occurrence of earth leakage and opening a main circuit contact. The conventional configuration is shown in FIGS.
First, FIG. 4 is an external view of the entire earth leakage breaker, 1 is a circuit breaker case, 2 is an operation handle, 3 is an earth leakage display button,
Is a nameplate, and the leakage display button 3 has a case 1
Is installed in a circuit breaker case together with a leak detection unit to be described later so as to protrude and retract in a button hole 1a opened in the front surface of the circuit breaker. Then, it always retracts from the front of the case and stands by, and when the circuit breaker trips when a short circuit occurs, the circuit breaker operates so as to protrude to the front of the case 1.

[0005] Next, FIG. 5 shows a conventional structure of a leakage display mechanism. In the figure, the leakage display mechanism includes the above-described leakage display button 3, a latch 5 for restraining and holding the button 3 at a standby position,
And trip coil (magnetic holding solenoid) 6,
It is composed of an assembly with the biasing spring 7 of the leakage display button. Here, the leakage display button 3 is provided with a display cap 3b facing the button hole 1a of the case 1 on the tip side of the base 3a,
At the opposite end, an armature 8 (not shown, the tip of the armature 8 is linked to a trip crossbar of a main contact opening / closing mechanism, and transmits the operation of the trip coil 6 to the trip crossbar to open / close the main circuit contact. Activate the mechanism,
When the operation handle 2 shown in FIG. 4 is reset from the OFF position to the ON position after the trip, the armature 8 linked thereto is reset.
The earth leakage display button 3 is pulled back to the retracted position via.)
It has. The latch 5 has a latch claw 5a at the end of the lever.
The electric leakage display button 3 is held at the retracted position by engaging with the engagement stepped portion 3c formed on the base 3a.

In such a configuration, when a leakage detection circuit incorporated in the circuit breaker detects the occurrence of leakage and activates the trip coil 6, the movable iron core 6a protrudes in the direction of arrow I under the bias of the driving spring 6b and latches. 5 is driven in the direction of arrow II. As a result, the latch claw 5a is disengaged from the engagement step 3d of the leakage display button 3, the display button 3 is driven in the direction of arrow III by the spring force of the biasing spring 7, and the display cap 3b moves forward from the circuit breaker case 1. The armature 8 protrudes to display the leakage, and the armature 8 drives the trip crossbar of the main contact opening / closing mechanism to trip the circuit breaker. When the operation handle 2 (see FIG. 4) is operated to the reset position after the interruption, the electric leakage display button 3 retreats via the armature 8 in conjunction with the operation, and the button cap 3b is retracted from the circuit breaker case 1.

[0005]

The conventional structure of the electric leakage display mechanism shown in FIG. 5 has the following problems. 1) Normally, the latch 5 is provided on the engagement step 3c of the leakage display button 3.
To prevent the latch 5 from coming off unexpectedly when vibration or impact is applied to the circuit breaker. To prevent this, the latch 5 and the engaging step 3c must be connected to each other. The wedge-shaped tapered surface is used as the contact surface between them, but the release operation is not performed smoothly.
In addition, problems such as an increase in the required driving force of the trip coil 6 arise.

2) In addition, the urging spring 7 is required separately from the trip coil 6 to drive the electric leakage display button 3. For example, the number of parts of the unit increases and the unit becomes large. Since wiring is performed with a lead wire between a printed circuit board (not shown) on which a separate leakage detection circuit is mounted, the number of steps for assembling the circuit breaker increases, and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems and to provide an improved earth leakage circuit breaker improved to achieve a stable earth leakage display operation and a small size and a compact size with a small number of parts. An object of the present invention is to provide a leakage display unit.

[0008]

In order to achieve the above object, an electric leakage display unit according to the present invention comprises a printed circuit board on which an electric leakage detection circuit is mounted, and a plunger solenoid which operates upon receiving an electric leakage detection signal from the circuit. And an assembly of a trip coil and a leakage indication button, wherein the leakage indication button is directly connected to the movable iron core of the trip coil, and the tip of the button is placed facing the front of the circuit breaker case. It shall be.

According to the above configuration, when the plunger-shaped movable core is attracted by the operation of the trip coil, the leakage display button directly connected to the movable core protrudes from the circuit breaker case to perform the leakage display. Therefore, no components such as a latch mechanism and an urging spring are required between the trip coil and the leakage indication button, so that the number of components can be reduced and a compact structure can be achieved. There is no resistance, and a series of operations can be performed smoothly with a small driving force.

Further, according to the present invention, based on the above configuration, the unit can be configured in the following specific forms. 1) The trip coil is mounted on the back side of the printed board, the coil terminal is connected to the printed board, and the leakage indication button is drawn forward through the printed board. With this configuration, the entire unit is made compact, and assembly into the circuit breaker is also simplified.

2) The leakage indication button is integrally formed with an armature as a trip actuator and is directly connected to the movable iron core of the trip coil. Thus, the number of parts can be further reduced. 3) A lock holding means for supporting the leakage display button at the protruding position in the trip operation state of the circuit breaker is provided, so that the display button is maintained at the protruding position even after the circuit breaker trip operation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings of each embodiment, the same members corresponding to FIGS. 4 and 5 are denoted by the same reference numerals. [Embodiment 1] In FIGS. 1 and 2 (a) and 2 (b), the leakage display unit 9 includes a unit case 10 and a printed circuit board 11 mounted with a leakage detection circuit and housed in the unit case 10.
And a trip coil 6 as a plunger-type solenoid mounted on the back side of the printed board 11, and directly connected to a movable iron core (plunger) 6 a of the trip coil 6 and passing through a hole opened in the board surface of the printed board 11. An electric leakage display button 3 facing the button hole 1a of the circuit breaker case 1, an armature 8 mounted on the opposite side of the button, and a locking and holding mechanism 12 for supporting the electric leakage display button 3 at a protruding position. And the unit is incorporated inside the circuit breaker case 1. 6c is the coil of the trip coil 6, and 6d is its yoke.

The trip coil 6 has a connection pin 6e protruding upward from the coil 6c drawn out to the upper surface side of the printed board 11 and soldered to a circuit pattern. Also,
The locking and holding mechanism 12 includes a protrusion 12a protruding laterally from an upper portion of an armature 8 made of a resin molded product, and a leg 1 of the unit case 10 facing above the protrusion 12a.
0a, a forked elastic claw portion 12b provided at the lower end. The armature 8 is linked with a trip crossbar 13 of a main circuit contact opening / closing mechanism. When the operation handle 2 shown in FIG.
The armature 8 is reset to the standby position shown in FIG. 1 and FIG.

In this configuration, when the trip coil 6 is actuated by a signal from the printed circuit board 11 that has detected the occurrence of electric leakage, the movable iron core 6a performs an attraction operation in the direction of arrow P, and as shown in FIG. The armature 8 drives the trip crossbar 13 to trip the main circuit contact opening / closing mechanism at the same time as protruding from the case 1 to display the leakage. In addition, this operation allows the above-described locking and holding mechanism 1
The second projection 12a passes through the space between the left and right claw portions 12b and emerges upward. Therefore, after the interruption, the trip coil 6
Even if the suction force is lost, the protrusion 12a remains hooked on the upper side of the claw portion 12b, whereby the electric leakage display button 3 is held so as to remain at the protruding position. And
When the operation handle 2 shown in FIG. 4 is reset from the OFF position to the ON position after the cutoff, the trip crossbar 13 pulls the armature 8 down from the position shown in FIG. 2B to the position shown in FIG. As a result, the movable iron core 6a of the trip coil 6 returns, and the protrusion 12a of the locking and holding mechanism 12 is moved to the claw 12b.
At the same time as returning to the original position, the electric leakage display button 3 is also retracted inside the case 1.

[Embodiment 2] FIGS. 3 (a) and 3 (b) are diagrams showing the configuration of an application embodiment according to a third aspect of the present invention. In this embodiment, an electric leakage display button 3, an armature 8 and Are integrated resin molded parts, and the parts are connected to the lower end of the movable core 6c of the trip coil 6. Thus, the number of parts and the number of assembly steps can be reduced as compared with the first embodiment. The button 3 penetrates the hole of the printed board 11 and faces the button hole of the circuit breaker case 1, and the other configuration and the leakage display operation are the same as those of the first embodiment.

[0016]

As described above, according to the structure of the present invention, the following effects can be obtained. 1) Using the trip coil as a plunger type solenoid
By connecting the leakage display button directly to the movable core,
In addition to eliminating the need for a latch mechanism and an urging spring as in the conventional configuration, the number of components can be reduced, and the driving force transmission path of the trip coil has no frictional resistance, so that the leakage display operation can be performed smoothly and reliably.

2) A unit case is used as a base and a printed board,
By assembling the trip coil, the ground fault display button, and the armature parts integrally into a unit, the size and size can be reduced, and the number of steps for assembling the unit into the circuit breaker can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration sectional view of a ground fault display unit according to a first embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams of the operation of the leakage display unit shown as a side view of FIG. 1, wherein FIG. 2A is a steady state diagram, and FIG.

FIGS. 3A and 3B are configuration diagrams of a ground fault display unit corresponding to a second embodiment of the present invention, wherein FIGS.

FIG. 4 is an external perspective view of the entire earth leakage breaker to which the present invention is applied.

FIG. 5 is a configuration diagram of a conventional leakage display mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker case 2 Operation handle 3 Electric leakage display button 6 Trip coil 6a Moving iron core 6c Coil 6d Yoke 6e Connection pin 9 Electric leakage display unit 10 Unit case 11 Printed board 12 Lock holding mechanism

Claims (4)

[Claims] An electric leakage display unit for an electric leakage breaker, wherein an electric leakage display button is projected to the front of a circuit breaker case and operated in conjunction with a trip operation of the circuit breaker when an electric leakage occurs, wherein the printed circuit board is provided with an electric leakage detection circuit. And an assembly of a trip coil serving as a plunger-type solenoid that operates in response to a leakage detection signal from the circuit, and a leakage display button, wherein the leakage display button is directly connected to a movable iron core of the trip coil. An earth leakage display unit for an earth leakage breaker, characterized in that a button tip is set facing the front of a circuit breaker case. 2. The electric leakage display unit according to claim 1, wherein the trip coil is mounted on the back side of the printed circuit board, the coil terminal is connected to the printed circuit board, and the electric leakage display button is penetrated through the printed circuit board to the front. An earth leakage display unit for an earth leakage breaker, which is drawn. 3. The leakage display unit according to claim 1, wherein the leakage display button is formed integrally with an armature as a trip actuator and directly connected to a movable iron core of the trip coil. 4. An earth leakage display unit for an earth leakage breaker according to claim 1, further comprising a retaining means for supporting the earth leakage display button at a projecting position in a trip operation state of the circuit breaker.