JP2002352876A - Ancillary terminal block for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting structure of an ancillary terminal block mounted on a circuit breaker so that the terminal block can be mounted on the side of the case of a breaker body in a simple single operation. SOLUTION: The ancillary terminal block is mounted on the side of a breaker case 1 for connecting appurtenances installed inside the beaker body, such as auxiliary switches, to an external signal line. A pair of 'dovetail grooves' 3b is formed on the front and rear of the side wall surface of a breaker case cover 3 having an auxiliary cover 10, respectively, and a pair of projected 'dovetails' 14a corresponding to the 'dovetail grooves' is formed on the interior wall surface of the ancillary terminal block, wherein the 'dovetails' are fitted into the 'dovetail grooves' from above the case to mount the ancillary terminal block on the side of the beaker case. Further, a recessed groove 3c for drawing out a lead wire is formed on the side of the beaker case cover, and a coming-off preventive projection 14b is provided on the auxiliary terminal block in the position corresponding to that of the recessed groove. While the ancillary terminal block is mounted on the breaker case, the coming-off preventive projection is pressed down from above with the auxiliary cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an auto breaker,
For circuit breakers such as earth leakage breakers, attached to the side of the breaker case to connect lead wires of auxiliary devices such as auxiliary switches and alarm switches built into the breaker body to external signal wires The present invention relates to a terminal block mounting structure.

[0002]

2. Description of the Related Art First, the auto breaker described above is used as an example.
FIGS. 4 and 5 show a schematic configuration of a circuit breaker to which the present invention is applied and an attached terminal block for connecting lead wires of an attached device. In FIG. 4, 1 is a circuit breaker case made of a resin molded product in which a case 2 and a cover 3 are combined, 4 is a fixed contact integrated with a power supply terminal, 5 is a movable contact, 6 is an opening / closing mechanism, and 7 is an operation handle. , 8 is an overcurrent trip device, 9
Is a load-side terminal, and a pocket-shaped recess 3a is formed in the cover 3 as an internal accessory device (optional accessory) for storing accessory switches to be described later side by side.
Further, an auxiliary cover 10 as an opening / closing lid is provided on the upper surface of the recess 3a.

Here, the cover 3 of the circuit breaker case 1 is
The operating handle 7 is pulled out from the upper surface of the central convex portion, and the concave portion 3a is defined in a region adjacent to the central convex portion on the power supply terminal side. In addition, the auxiliary cover 10
Is a one-sided opening / closing lid whose right and left ends are hinged to a bearing portion of the cover 3, and the lid portion has an L-shaped cross section as shown in the drawing, and its upright end face abuts against the wall surface of the convex portion of the cover 3. The screw is fastened to the cover 3 in the closed position.

In FIG. 5, reference numeral 11 denotes an auxiliary switch as an attached switch (an ON / OFF state of a main circuit contact is taken out as an electric signal in conjunction with a movable contact 5 of a circuit breaker), and 12 is an alarm switch ( An operation signal is extracted to the outside when the circuit breaker trips). Reference numeral 13 denotes lead wires of switches 11 and 12. When these attached switches are provided in the circuit breaker body, the auxiliary cover 10 shown in FIG. After being opened to the chain line position, the auxiliary switch 11 and the alarm switch 12 are arranged side by side as shown in FIG. 5 and inserted into the recess 3a defined in the cover 3 of the circuit breaker case 1 and mounted. In some cases, the lead wire 13 of each attached switch is drawn out to the side of the circuit breaker case 1 and connected directly to an external signal line. However, usually, an attached terminal block for connecting the lead wire 13 to an external signal line is used. (Optional product) 14 is prepared, and the attached terminal block 14 is mounted on the side surface of the circuit breaker case 1 so that an external signal line is wired.

Here, conventionally, the accessory terminal block 14 is screwed to the side surface of the circuit breaker case 1 by using a set screw, or a hook-shaped mounting seat protruding and formed on the inner surface side of the accessory terminal block 14 is connected to the circuit breaker. Case 2 of Case 1 and Cover 3
And fixed at the mounting position.

[0006]

However, the conventional mounting structure of the attached terminal block has the following problems in terms of handling. In other words, the optional switch and terminal block, which are optional items, should be installed with the user's load as little as possible in consideration of the case where the circuit breaker is installed on the distribution board etc. and the user will be additionally equipped. It is desirable that it can be easily mounted. Such a point,
In the conventional mounting structure, when the attached terminal block is mounted on the circuit breaker main body, it takes time and effort such as screw fastening, or once removing the cover of the circuit breaker case and assembling it.

The present invention has been made in view of the above points, and does not require any troublesome work such as screwing or removing a cover of a circuit breaker case, and the case side of the circuit breaker body can be operated by a simple one-touch operation. It is an object of the present invention to provide a terminal block attached to a circuit breaker in which a mounting structure is improved so that the terminal can be mounted on a circuit breaker to improve serviceability to a user.

[0008]

According to the present invention, an auxiliary switch, an alarm switch, etc., mounted on the side of a circuit breaker case comprising a case and a cover and incorporated in the circuit breaker body, are provided. An auxiliary terminal block for connecting an auxiliary device to an external signal line, wherein the cover includes a recess for storing the auxiliary device, and an auxiliary cover for covering an upper surface of the recess. A pair of front and rear "grooves" is formed on the inner wall surface of the attached terminal block, and a "groove" corresponding to the "groove" is formed, and the "groove" is formed in the "groove" from above the case. The attached terminal block is fitted on the side surface of the circuit breaker case.

Further, according to the present invention, in order to lock and hold the attached terminal block so as not to come off from the mounting position, in addition to the above-described configuration, a recess for leading a lead wire formed on the side surface of the cover of the circuit breaker case. A retaining projection is provided on the inner surface side of the accessory terminal block corresponding to the groove, and with the accessory terminal block attached to the circuit breaker case, the retaining projection is pressed down from above by the auxiliary cover and held in the mounting position. (Claim 2).

[0010] In the above configuration, when attaching an accessory device (an accessory switch, an alarm switch, etc.) and an accessory terminal block for connecting the lead wire and an external signal wire to the circuit breaker body, the lead wire of the accessory device must be connected in advance. With the auxiliary cover of the circuit breaker case open with the auxiliary device connected to the terminal of the accessory terminal block, the accessory device is inserted into the recess of the case cover from above. In addition, the attached terminal block has an "indented groove" formed on the side wall of the case cover with an "indented" protruding inward.
To fit. Then, by returning the auxiliary cover to the closed position and tightening the screws, the attached device and the attached terminal block are simultaneously held at the respective mounting positions.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on the embodiments shown in FIGS. In the drawings of the embodiment, the same members corresponding to FIGS. 4 and 5 are denoted by the same reference numerals, and the description thereof will be omitted. That is, in the illustrated embodiment, the dovetail-shaped cross-section “dove groove” 3b is provided on the left and right side walls of the cover 3 with respect to the circuit breaker case 1 at the front and rear.
Are formed in the up-down direction, and the recessed portion 3a for storing the accessory device in alignment with the auxiliary cover 10 is provided with a vertical recess for drawing out the lead wire 13 (see FIG. 5) of the accessory device out of the case. A groove 3c is formed. On the other hand, on the inner wall surface of the attached terminal block 14 mounted on the side surface of the circuit breaker case 1, there are provided "a" 14a having a dovetail cross section corresponding to the "a" groove 3b and the concave groove 3c, respectively, and a retaining projection. 14b is formed. The attached terminal block 14
Has a hollow structure, and the lead wire of the attached device drawn in through the opening opened to the inner wall surface side is connected to the screw terminal 1.
4c.

In this configuration, when the auxiliary switches such as the auxiliary switch 11 and the alarm switch 12 shown in FIG. 5 and the auxiliary terminal block 14 connected to the lead 13 of the auxiliary switch are provided in the circuit breaker main body, Attach it according to the work procedure described above. First, as a preparation work, the auxiliary switch 11,
The lead wire 13 of the alarm switch 12 is connected to the screw terminal 14c of the attached terminal block 14. Subsequently, the auxiliary cover 10 of the circuit breaker case 1 is opened, and the auxiliary switch 11 and the alarm switch 12 are inserted and set into the recess 3a of the cover 3 from above.

Next, the attached terminal block 14 is connected to the circuit breaker case 1.
The "present" 14a and the retaining projection 14b of the attachment terminal block 14 are formed on the side of the cover 3 from above so that the "present" 14b and the concave groove 3c can be attached to the side of the cover 3 respectively.
(See FIG. 1). Thereby, FIGS. 3 (a) to 3 (c)
As shown in the figure, the attached terminal block 14 is locked and mounted on the side surface of the circuit breaker case 1. Finally, the auxiliary cover 10 is returned to the closed position, and when the auxiliary cover 10 is fastened to the case cover 3 with the set screw 15, the auxiliary cover 10 is overlaid on the retaining protrusion 14 b so that the auxiliary terminal block 14 is not attached to the mounting position. Hold down. As a result, the auxiliary switch 11, the alarm switch 12, and the attached terminal block 14 are simultaneously held at the respective mounting positions.

When removing the accessory device and the accessory terminal block from the circuit breaker main body, the accessory device and the accessory terminal block must be removed in the reverse procedure.

[0015]

As described above, according to the construction of the present invention, a pair of front and rear "recess grooves" are formed on the side wall surface of the cover of the circuit breaker case, and the "recess groove" is formed on the inner wall surface of the attached terminal block. Forming a "present" corresponding to the "groove" and forming the "present"
Into the "groove" from the top of the case so that the attached terminal block is attached to the side of the circuit breaker case. Further, a retaining projection is provided on the inner side of the attached terminal block, and the attached terminal block is attached to the circuit breaker case. In the mounted state, the retaining protrusion is pressed down from above by the auxiliary cover and held at the mounting position, so that the attached terminal block can be screwed to the side of the circuit breaker case as in the conventional mounting structure, or the circuit breaker case No need for any troublesome operations such as removing the cover and holding it between the case and fixing the auxiliary cover after fitting the “available” of the attached terminal block into the “available groove” on the breaker case side. The attached terminal block can be mounted on the side of the main body of the circuit breaker with a simple mounting work just by closing.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a state before an attached terminal block according to an embodiment of the present invention is mounted on a circuit breaker.

FIG. 2 is a structural view of an attached terminal block in FIG.
(c) Side view, plan view and end view, respectively.

3 is a view showing a state in which the accessory terminal block of FIG. 2 is mounted on a circuit breaker case of a circuit breaker, wherein (a) to (c) are a plan view, a side view, and an end view of a partially cut away, respectively.

FIG. 4 is a configuration sectional view of a circuit breaker to which an attached terminal block is applied.

FIG. 5 is a partial plan view of the circuit breaker shown together with the accessory device and the accessory terminal block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breaker case 2 Case 3 Cover 3a Recess for accommodating device 3b Recessed groove 3c Recessed groove 10 Auxiliary cover 11 Auxiliary switch (attached device) 12 Alarm switch (attached device) 13 Lead wire 14 Attached terminal block 14a Available 14b Exit Set projection 14c Screw terminal 15 Set screw for auxiliary cover

Continued on the front page F term (reference) 5E086 DD05 DD39 DD44 HH08 LL04 LL20 5G030 XX20 YY04 5G052 HA02

Claims (2)

[Claims] An accessory terminal block attached to the side of a circuit breaker case consisting of a case and a cover to connect an auxiliary device built in the circuit breaker main body to an external signal line, wherein the cover has a recess for storing the accessory device. And an auxiliary cover for covering the upper surface of the recess, wherein a pair of front and rear "recess grooves" are formed on the cover side wall surface of the circuit breaker case, and the "recess grooves" are formed on the inner wall surface of the attached terminal block. , And the "present" is inserted into the "present groove" from above the case, and the attached terminal block is mounted on the side surface of the circuit breaker case. Terminal block attached to the circuit breaker to be used. 2. The accessory terminal block according to claim 1, wherein a retaining projection is provided on an inner surface side of the accessory terminal block corresponding to a concave groove for leading a lead wire formed on a side surface of a cover of the circuit breaker case. An accessory terminal block for a circuit breaker, wherein the retaining projection is held down from above by an auxiliary cover and held in a mounting position with the accessory terminal block attached to the case.