JP4455162B2 - Surge protection device - Google Patents

Description

  The present invention relates to a surge protection device (SPD) that protects various electrical devices connected to a power line from lightning surges.

Surge protection devices (arrestors, lightning arresters) that protect electrical devices connected to power lines from malfunctions and damage caused by lightning surges, printed circuit boards with non-linear voltage limiting elements such as zinc oxide, and surge protection circuit components such as discharge gaps and fuses Surge protection unit mounted in a flat insulating housing and a horizontally long terminal block that is electrically and mechanically attached to and removed from the surge protection unit. The terminal block is a DIN rail, switchboard, etc. Generally, it is used by attaching to external equipment. For example, when this flat type surge protection device is used for a large number of power lines, a plurality of the same type are installed facing a DIN rail or the like in parallel with a minute gap (see, for example, Patent Document 1). .
JP2003-102126A (FIG. 1)

  In the surge protection device, one surge protection unit is fitted into each of a plurality of terminal blocks fixed in parallel to an external device by a one-touch method. Also, if the surge protection means of the surge protection unit deteriorates or breaks down, the surge protection unit can be removed from the terminal block of the external device by hand and replaced with a new one quickly and easily. Both the terminal block and the surge protection unit have a terminal charging part that exposes a metal plate that can be electrically and mechanically connected in a one-touch manner. In practical use, this terminal charging part is insulated with an insulating cover. It is necessary to protect and prevent electric shock.

  Most of this type of insulating cover is in a prototype stage that is fitted into the terminal charging portion and attached by screwing. The former fitting type cover is easy to attach with one touch, but it is easy to come off due to external vibration or impact, and it cannot be said to be a good electric shock prevention structure. The latter screw-on type cover cannot be easily removed due to external vibrations or shocks, but the attachment / detachment workability is poor, and it is not practical in facilities in which a large number of surge protection devices are arranged in an external device.

  In addition, if the surge protection unit is fitted into the terminal block fixed to the external device with a one-touch fitting, and an insulating cover is fitted into the terminal charging part of the terminal block and the surge protection unit, the terminal block is attached to the terminal block. If the surge protection unit is loose due to external vibration or shock, the insulating cover may be loose with respect to the terminal block or surge protection unit and easily come off.

  An object of the present invention is to provide a surge protection device that adopts the modified electric shock prevention structure by modifying the electric shock prevention structure of the surge protection device in which the terminal block and the surge protection unit are attached and detached with one touch. It is in.

In order to achieve the above object, the present invention provides a surge protection unit in which terminal fittings are exposed on both side surfaces of a base end portion of a flat insulating housing for storing surge protection means, and a base end portion of the housing in the vertical direction. Contacts that are in electrical and mechanical contact with the terminal fitting when the base end portion of the housing is inserted into the concave portion at both ends of the horizontally long insulating base having a concave portion that is removably inserted into the center portion of the upper surface. In a surge protection device that has a terminal block that exposes the metal fittings, it is detachably fitted to the terminal charging part exposed from the terminal metal fittings and the contact metal fittings on the side surface of the housing base end and the base end in a vertical direction. A terminal cover for preventing electric shock that is partially locked to the terminal charging unit side, and the terminal cover restrains elastic deformation of the contact metal fitting when the terminal cover is fitted to the end of the base , thereby causing a surge from the terminal block. have a stopper to prevent the omission of protection unit in one piece And wherein the Rukoto.

  Here, the casing of the surge protection unit is a substantially rectangular flat box-shaped resin case and houses surge protection means mounted with a voltage limiting element or the like. The lower part of the housing is the base end part, and terminal fittings wired to the surge protection means are fixed to both side surfaces thereof. The terminal block includes a pair of contact fittings at both ends of a resin base that is fixed to an external device such as a DIN rail or a switchboard by screwing or the like. These terminal fittings and contact fittings are metal plates that are in electrical and mechanical contact with each other. The base of the terminal block has a recess at the center of the upper surface thereof where the base end portion of the casing of the surge protection unit is inserted in a one-touch manner from the vertical direction. Here, the vertical direction is a relative direction with respect to a terminal block installed on a horizontal external device. A pair of contact fittings are disposed inside the both ends of the base that form both side walls of the recess. Each of the pair of contact fittings extends to the upper surface of both ends of the base, and an external wire connecting terminal member such as a terminal screw is provided in the extended portion. The terminal block exposes the contact brackets at both ends of the base, the surge protection unit exposes the terminal brackets on both sides of the chassis, and when the surge protection unit is attached to the terminal block, the terminal bracket and contact bracket come into contact with each other A charging part is formed, and a terminal cover, which is a feature of the present invention, is detachably fitted to the terminal charging part for insulation protection, thereby preventing electric shock.

  The terminal cover is a resin-molded product that is detachably fitted on both ends of the base of the terminal block to which the surge protection unit is fitted and on both sides of the casing of the surge protection unit. Enclose and protect. Although an appropriate wiring gap is provided between the terminal cover fitted to the terminal block and the terminal block, there is no gap for a finger to enter, and this serves to prevent electric shock. The terminal cover locking means is formed by a displacement portion that can be elastically deformed at the tip of a thin hard external member (small tool) such as a flat-blade screwdriver, and a small protrusion provided at the tip of the displacement portion. Can do. This locking means is integrally formed on the lower surface of the top plate portion that forms the upper surface of the terminal cover so that the displacement portion can be elastically displaced only by a thin external member inserted from directly above. In addition, a locking portion such as a small hole for locking the small protrusion to the base of the terminal block or the casing of the surge protection unit is formed in correspondence with the small protrusion of the locking means. At the stage where the terminal cover is inserted into the terminal block and the terminal charging part of the surge protection unit with a one-touch attachment, the locking means is locked to the locking part to prevent the terminal cover from rattling and falling off, and the removal is thin. Do not do this unless an external member is used.

  Further, in the present invention, in the surge protection device in which the terminal fitting of the terminal block is elastically deformed by pressing the terminal fitting of the surge protection unit, the side surface of the casing base end of the surge protection unit and the base end of the terminal block A terminal cover for preventing electric shock that is detachably fitted to the terminal charging part exposed from the terminal charging part and the contact metal part from above and locked to the terminal charging part side. It is characterized by integrally having a stopper that restrains the elastic deformation of the contact metal fitting and prevents the surge protection unit from coming off from the terminal block when fitted to the end of the base.

  Here, the pair of contact fittings at both ends of the base of the terminal block are pressed against each other by the pair of terminal fittings on both sides of the base end when the casing base end of the surge protection unit is fitted, The contact fittings are elastically deformed in the direction of spreading away from each other, and the base end portion of the casing is firmly sandwiched and supported by this elastic deformation. When removing the surge protection unit from the terminal block, it is performed by pressing one of the pair of contact fittings and elastically deforming the casing of the surge protection unit. The stopper provided on the terminal cover is a tongue piece or a protrusion that prevents the elastic deformation from coming into contact with a pair of contact fittings at both ends of the base of the terminal block when the terminal cover is fitted to the terminal block. If the terminal cover is fitted to the terminal block with the surge protection unit fitted and the contact bracket is restrained from elastic deformation by the stopper, one of the contact fittings is pushed and elastically deformed by the case of the surge protection unit. Even if you try, you can not. That is, the surge protection unit cannot be removed from the terminal block unless the terminal cover is removed from the terminal block to release the restraint of the contact fitting. As a result, until the terminal cover is removed from the terminal block, the surge protection unit is stably attached to the terminal block without rattling, and the terminal cover fitted to the terminal block is also stable because the surge protection unit stabilizes on the terminal block. Is maintained, and a stable electric shock can be prevented.

  Moreover, in this invention, the said latching means can be integrally provided in the terminal cover provided with the said stopper. Both the stopper and the locking means of the terminal cover improve the mounting stability of the terminal cover to the terminal block, and construct a more stable electric shock prevention structure.

  In the present invention, a handle can be integrally projected on the upper surface of the terminal cover. The handle may be like a knob that can be picked with two fingers, and the terminal cover is removed from the terminal block by picking the handle and pulling it up directly. If the terminal block is placed close to or in contact with an external device and a surge protection unit and terminal cover are attached to each terminal block, there will be no gap between the adjacent terminal covers and it will be difficult to remove the terminal cover. However, if a handle is provided on the upper surface, it can be easily removed.

  Such a terminal cover may have a structure in which the upper surface of the casing of the surge protection unit assembled to the terminal block and the upper surface of the terminal cover are aligned. If this is done, there will be no gap between the surge protection unit housing and the terminal cover so that fingers can not enter the corners of the surge protection unit and terminal cover. Therefore, a stable electric shock prevention structure is obtained in which both the surge protection unit and the terminal cover are less likely to rattle against the terminal block. In addition, since the surge protection unit and the terminal cover are arranged at the same height on the terminal block, it is possible to provide a locking means for locking the surge protection unit on the upper part of the terminal cover. A stopper can be formed in the lower part of the terminal cover, and the locking means and the stopper can be easily designed.

  According to the present invention, the electric shock prevention structure in which the terminal cover is fitted to the terminal charging portion of the surge protection device in which the terminal block and the surge protection unit are connected is formed by inserting the external member from the vertical direction through the terminal cover locking means. As long as the terminal cover is not elastically deformed, the terminal cover does not come off, and the terminal cover does not rattle due to unintentional vibration or impact from the outside. In addition, the terminal cover can be easily fitted into the terminal block with a single touch, and a small tool such as a flat-blade screwdriver can be used as an external member to remove the attached terminal cover. A surge protection device can be provided.

  In addition, by providing a stopper to restrain the terminal bracket contact bracket on the terminal cover, the surge protection unit cannot be removed from the terminal block unless the terminal cover is removed. It is possible to suppress the backlash of both terminal covers, and it is possible to provide a surge protection device with a terminal cover having a stable electric shock prevention function.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 to 3 show a surge protection device 1 installed on an external device 2 such as a DIN rail or a switchboard indicated by a chain line, and FIG. 4 is an exploded view of the surge protection device 1. The surge protection device 1 has a structure in which a flat surge protection unit 10 and a terminal block 20 are detachably connected, and a pair of electric shock prevention terminal covers 40 are detachably fitted. A terminal cover 40 is fitted to a terminal charging unit 30 between the surge protection unit 10 and the terminal block 20 and the exposed terminals of the terminal charging unit 30 (exposed portions of the terminal fitting 13 and the contact fitting 23 described later). ) Is an electric shock prevention structure covered by the terminal cover 40.

  The surge protection unit 10 has a surge protection means 11 housed in a substantially rectangular and flat insulating casing 12, and a pair of terminal fittings on both side surfaces of a base end portion 12a which is a lower portion of the casing 12 in FIG. 13 is exposed. The terminal fitting 13 is an electrode terminal wired to the surge protection means 11 in the housing 12. The surge protection means 11 is mounted with a zinc oxide type voltage limiting element, a fuse or the like. The casing 12 is a resin molded product having a bottom opening at the upper end, houses the surge protection means 11 from the upper end opening, and closes the upper end opening with a lid 12b of a transparent resin plate. Such a surge protection unit 10 can use an existing product.

  The terminal block 20 has a horizontally long resin base 21 slightly thicker than the surge protection unit 10. The base 21 has rectangular block-shaped end portions 21a on both sides of the central portion, and a U-shaped concave portion 22 is formed on the upper surface of the central portion and the inner surfaces of both end portions 21a. The concave portion 22 is a portion where the casing base end portion 12a of the surge protection unit 10 is attached and detached in the vertical direction, and a pair of contact fittings 23 are installed facing both ends of the concave portion 22. As shown in FIG. 5, the contact fitting 23 includes an outer vertical portion 23 a and an inner vertical portion 23 b that are bent and opposed in a vertically long U shape, and a horizontal portion 23 c that is bent at a right angle outward from the upper end of the inner vertical portion 23 b. The gap g of the upper end opening is formed between the outer vertical portion 23a and the inner vertical portion 23b. The horizontal part 23c is installed on the end part 21a of the base 21 and fixed. As shown in FIG. 5, a female screw block 35 is integrally fixed below the center of the horizontal portion 23c, and the female screw block 35 is embedded and fixed in the base end portion 21a. A terminal screw 24 is screwed onto the female screw block 35, and an electrical mechanical connection between the contact fitting 23 and an external electrode wire is performed using the terminal screw 24.

  In addition, guide grooves 31 and 32 and guide ribs 34 extending in the vertical direction are formed on the front and rear surfaces of both end portions 21a of the base 21, and these are used for attaching and detaching the terminal cover 40 and the like. Will be described later.

  As shown in FIG. 4, when the base end portion 12a of the casing 12 of the surge protection unit 10 is pushed into the recess 22 of the terminal block 20 from above, a pair of terminal fittings 13 exposed on both side surfaces of the base end portion 12a correspond. The outer vertical portions 23a of the pair of contact fittings 23 are slidably contacted to elastically deform the outer vertical portions 23a so as to push outward in the direction of narrowing the gap g, and the base end portion 12a is press-fit to the bottom of the concave portion 22 as it is. Fitted. The elastically deformed contact fittings 23 at both left and right ends of the recess 22 repress the housing base end portion 12a from both sides, and support the surge protection unit 10 in the recess 22 in a stable and constant posture. Further, as shown in FIG. 4, an engagement hole 14 is formed at a fixed position of the terminal fitting 13, an engagement protrusion 15 as shown in FIG. When the housing base end portion 12a is fitted, the engagement hole 14 and the engagement protrusion 15 are engaged to make the mounting posture of the surge protection unit 10 more stable. To remove the surge protection unit 10 from the recess 22, hold the upper portion of the housing 12 with a hand and apply an external force in either the left or right direction in FIG. The operation can be performed by elastically deforming g in a narrowing direction and returning the other elastically and pulling it up.

  Further, the terminal block 20 has a structure that can be installed on either a DIN rail (not shown) or a switchboard. For example, a concave step 25 is formed at the center of the lower surface of the base 21, and protrusions 26 and 27 that are locked to the DIN rail are formed at both ends of the concave step 25, and the DIN rail is fitted into the concave step 25. It can be inserted. Further, a cylindrical mounting seat portion 28 is integrally projected at the center of the top surface of the recessed step portion 25, and a positioning projection 29 is integrally projected on the lower surface of one base end portion 21a. The lower surface of 21 is positioned by positioning protrusions 29, and the mounting seat 28 is screwed to the switchboard.

  A pair of terminal covers 40 attached to both ends of the terminal block 20 are resin molded products having the same shape, and have a top plate portion 40a, side plate portions 40b and 40c, and a front plate portion 40d as shown in FIG. The top plate portion 40a is rectangular in plan view, and has a handle 43 integrally on the rear portion of the top surface. Both sides of the handle 43 are formed into a concave space so that the handle 43 can be easily picked up with fingers. The locking means 41 is integrally formed on the upper portion of one side plate portion 40b (the front side plate in FIG. 5), and a linear guide portion 45 extending vertically is integrally formed on the inner surface, and is projected upward at the lower end. An extending slit portion 44 is formed. The other side plate part 40 c includes a guide part 45 and a slit part 44. A front plate portion 40d is formed between the upper front ends of the both side plate portions 40b and 40c, and a tongue-like stopper 42 is integrally formed downward from the lower end central portion of the front plate portion 40d. The stopper 42 is a spacer that enters the gap g of the contact fitting 23 of the surge protection unit 10 fitted to the terminal block 20 and restrains the elastic deformation of the contact fitting 23. The stopper 42 is inclined outward from the front plate portion 40d. An inclined portion inclined in the direction and a vertical tongue piece portion extending directly from the tip of the inclined portion.

  The terminal cover 40 is of a size that can be inserted into the base end portion 21a of the terminal block 20, and when the terminal cover 40 is inserted from above the base end portion 21a, the guide portions 45 of the both side plate portions 40b and 40c are formed. The guide groove 31 is guided and inserted into the guide grooves 31 on both side surfaces of the base end 21a, and the notch 44 is then inserted into the guide rib 34 so that the lower end of the terminal cover 40 is flush with the lower end of the base end 21a. To the final position. At the time of fitting to this final position, the locking means 41 is locked to the base end 21a and is restrained at the final insertion position shown in FIG.

  A specific structure of the locking means 41 is shown in FIGS. The locking means 41 has a displacement portion 41a that can be elastically deformed at the tip of the external member 3 as shown by a chain line in FIG. 6, and a small protrusion 41d provided at the tip of the displacement portion 41a. The displacement portion 41a is a vertical piece extending downward from the top plate portion 40a, and has a pair of triangular rib portions 41b integrally projecting on the outer surfaces of both sides. A rectangular plate portion 41c extends integrally downward from the ends of the pair of rib portions 41b, and a small protrusion 41d projects from the center of the inner surface of the plate portion 41c. A small rectangular work hole 46 is formed between the lower end of the displacement portion 41a and the upper end of the plate portion 41c. The working hole 46 is a small hole that can be inserted into the external member 3, for example, a small flat-blade screwdriver 3, and the tip of the flat-blade screwdriver 3 can be inserted into and removed from the working hole 46 only in the vertical direction. When the tip of the flathead screwdriver 3 is inserted into the working hole 46 and the tip of the flathead screwdriver 3 is moved to the right in FIG. 6, the displacement portion 41a is illustrated via the plate portion 41c by engaging with the upper end portion of the plate portion 41c. 6 to move right. When the flathead screwdriver 3 is pulled out, the displacement portion 41a is elastically returned to the original vertical position. The rib portion 41b can displace the displacement portion 41a at the tip of the minus driver 3 as described above by giving the displacement portion 41a appropriate strength in the displacement direction, but can be easily displaced by other methods. I can't do that.

  Corresponding to the locking means 41 of the terminal cover 40, a locking portion 33 is formed on the base end portion 21 a of the terminal block 20 as appropriate for locking with the small protrusion 41 d. The locking portion 33 is a square hole formed in the upper end portion of the guide groove 31d of the base end portion 21a, for example. This square hole may be provided in each of the pair of guide grooves 31d provided on both side surfaces of the base end 21a, but is provided only in one in the drawing. When the terminal cover 40 is inserted into the base end portion 21a as described above, the guide portion 45 of the terminal cover 40 is guided by the guide groove 31 of the base end portion 21a. When the protruding portion 41d approaches the locking portion 33 of the square hole from directly above and reaches the final position, the small protruding portion 41d moves over the displacement portion 41a by elastically displacing the locking portion 33. Lock in the hole. This locking is reliably performed by the guide by the guide portion 45. Further, the locking cannot be released unless the displacement portion 41a is displaced by the flat-blade screwdriver 3.

  When the housing base end 12 a of the surge protection unit 10 is fitted into the recess 22 of the terminal block 20, the head of the terminal screw 24, the upper end of the contact fitting 23, or the housing on the base end 21 a of the terminal block 20. The charging part of the upper end part of the terminal metal fitting 13 of the base end part 12a is exposed, and the terminal charging part 30 is made. The terminal cover 40 is fitted and inserted into the base end 21a from directly above so as to cover the terminal charging unit 30. At the time of this insertion, the stopper 42 of the terminal cover 40 is inserted into the gap g of the contact fitting 23 to restrain the contact fitting 23.

  As shown in FIG. 4, in a state where the terminal block 20 is fixed on the external device 2 such as a DIN rail, the surge protection unit 10 is fitted on the terminal block 20 by elastically deforming the contact fitting 23, and then a pair of The terminal cover 40 is fitted to the corresponding terminal charging unit 30 from directly above. In the terminal cover 40, the locking means 41 is locked to the locking portion 33 of the base end portion 21 a so that the terminal cover 40 does not come off, and the back and forth and right and left movements are also restrained by the base end portion 21 a and the casing 12 of the surge protection unit 0. The terminal charging unit 30 is covered with a stable posture, and a stable electric shock prevention structure is maintained. Even if a person's finger touches the terminal cover 40 unintentionally, the terminal cover 40 is not rattled and the finger does not enter the terminal cover 40, so that a stable electric shock prevention structure is obtained. Further, even if the terminal cover 40 is directly removed by hand, the locking means 41 cannot be displaced by a finger, so that troubles such as removing the terminal cover 40 directly by hand and causing an electric shock are eliminated, which is safe. The terminal cover 40 cannot be removed unless the locking means 41 is displaced using a small tool such as a flat-blade screwdriver 3. The removal work using such a small tool is easy, and it is convenient because the small tool to be used can be an ordinary thing such as a thin hard bar, and it is economical because it does not require the use of a special dedicated tool. Is.

  Further, as shown in FIG. 8, when the terminal cover 40 is fitted to the terminal charging unit 30, the stopper 42 enters the gap g of the contact metal fitting 23 and comes into contact with the inner surface side of the outer vertical portion 23a, thereby forming the outer vertical portion. It restrains that 23a elastically deforms outward. This restriction is simultaneously performed on the pair of left and right contact fittings 23 of the terminal block 20. As a result, even if the upper part of the casing 12 of the surge protection unit 0 is held and moved to the left and right to be removed from the terminal block 20, the pair of contact fittings 23 is not elastically deformed and the casing 12 is firmly fixed. Maintained. Therefore, the surge protection unit 10 is not rattled with respect to the terminal block 20, the backlash of the surge protection unit 10 is transmitted to the terminal cover 40 and the terminal cover 40 is not rattled, and the attitude of the terminal cover 40 is stabilized. A stable electric shock prevention structure can be maintained.

  Further, the surge protection unit 10 cannot be removed from the terminal block 20 unless the terminal cover 40 is first removed using a small tool. The terminal cover 40 is removed in a situation where an electric shock accident such as replacement of the surge protection unit 10 does not occur (a situation where the terminal charging unit 30 is not charged). If the surge protection unit 10 is forcibly removed from the terminal block 20 when the terminal charging unit 30 is in a charging state, a part of the terminal charging unit 30 may be exposed to cause an electric shock trouble. Since it cannot be removed, there is no electric shock problem and a stable electric shock prevention structure can be maintained.

  9 and 10 show a use state in which a plurality of terminal blocks 20 are installed in parallel at a predetermined pitch P on the external device 2. The pitch P is determined by abutting the guide ribs 34 protruding from both side surfaces of the terminal cover 40 of the adjacent terminal block 20. The plurality of juxtaposed surge protection devices 1 are close to each other, and a gap between the adjacent terminal covers 40 is not allowed to enter. When removing the terminal cover 40 from the terminal block 20, the locking means 41 is displaced from directly above using a small tool with one hand, the handle 43 is gripped with the other hand, and the terminal cover 40 is pulled straight up. Done in This removal operation can be easily performed without being disturbed by the adjacent terminal cover 40. Moreover, even when the adjacent terminal cover 40 contacts and there is no gap, it can carry out.

  FIG. 11 is a diagram for explaining another embodiment. The upper surface of the surge protection unit 10 is flush with the upper surface of the casing 12 of the surge protection unit 10 when the overall height of the terminal cover 40 is increased and the terminal cover 20 is fitted. To. In the case of this embodiment, the stopper 42 is installed at the lower part of the front surface of the terminal cover 40, the locking means 41 ′ is installed at the upper part, and the small protrusion 41e of the locking means 41 ′ is attached to the housing of the surge protection unit 10. It is made to latch on the latching | locking part 33 'formed in the upper side surface of the body 12. FIG.

  When the surge protection device of FIG. 11 is juxtaposed in a plurality of rows on the external device 2, the entire upper surface becomes a flat surface in which the upper surface of the surge protection unit 10 and the upper surface of the terminal cover 40 are flush with each other. Thus, it is difficult for a finger to be caught on the upper corners of the casing 12 and the terminal cover 40, and the postures of the surge protection unit 10 and the terminal cover 40 become more stable, and a stable electric shock prevention structure is maintained.

  It should be noted that the surge protection device of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

It is a front view which shows embodiment of this invention. It is a top view of the surge protection device of FIG. It is a side view of the surge protection device of FIG. FIG. 2 is an exploded front view of the surge protection device of FIG. 1. FIG. 2 is a partial exploded perspective view of a terminal block and a terminal cover in the surge protection device of FIG. 1. It is an enlarged view including the partial cross section of the terminal block and terminal cover of the surge protection apparatus of FIG. (A) is a partial front view of a terminal cover, (B) is sectional drawing which follows a TT line. It is the elements on larger scale containing the partial cross section of the surge protective device of FIG. It is a side view when a plurality of surge protection devices are juxtaposed. It is a top view when a plurality of surge protection devices are juxtaposed. It is a front view for demonstrating other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surge protection device 2 External device 3 External member, flat head screwdriver 10 Surge protection unit 11 Surge protection means 12 Case 12a Case base end 13 Terminal metal fitting 20 Terminal block 21 Base 21a Base end 22 Recess 23 Contact metal fitting 30 Terminal Charger 40 Electric shock prevention terminal cover 41a Displacement part 41d Small protrusion 41e Small protrusion 42 Stopper 43 Handle 46 Working hole

Claims (5)

A surge protection unit that exposes terminal fittings on both side surfaces of the base end of a flat insulating housing for storing surge protection means, and a recess into which the housing base end is removably inserted. When the housing base end is inserted into the recess at both ends of the horizontally long insulating base at the center of the upper surface, it is elastically deformed by the pressing of the terminal fitting and makes electrical and mechanical contact with the terminal fitting. In a surge protection device comprising a terminal block that exposes a contact fitting,
The terminal cover for electric shock prevention that is detachably fitted from the vertical direction to the terminal charging unit that is exposed to the terminal fitting and the contact fitting on the side surface of the casing base and the end of the base, and is locked to the terminal charging unit side. And the terminal cover integrally includes a stopper that restrains elastic deformation of the contact fitting and prevents the surge protection unit from coming off from the terminal block when fitted to the end of the base. Surge protection device. A surge protection unit that exposes terminal fittings on both side surfaces of the base end of a flat insulating housing for storing surge protection means, and a recess into which the housing base end is removably inserted. When the housing base end is inserted into the recess at both ends of the horizontally long insulating base at the center of the upper surface, it is elastically deformed by the pressing of the terminal fitting and makes electrical and mechanical contact with the terminal fitting. In a surge protection device comprising a terminal block that exposes a contact fitting,
For electric shock prevention that is detachably fitted to the terminal charging unit exposed from the terminal fitting and the contact fitting on the side surface of the casing base and the end of the base, and is partially locked on the terminal charging unit side. A terminal cover, the terminal cover is elastically deformed by an operation of an external member inserted from above and below, and is locked to the terminal charging unit side; A surge protection device comprising a stopper integrally for restraining elastic deformation of the contact fitting and preventing the surge protection unit from coming off from the terminal block. The surge protection device according to claim 2 , wherein a handle is integrally provided on the upper surface of the terminal cover. The surge protection device according to claim 2 , wherein the upper surface of the casing of the surge protection unit assembled to the terminal block and the upper surface of the terminal cover are flush with each other. The surge protection device according to claim 2 , wherein a plurality of the terminal blocks are juxtaposed in a state of being overlapped in the width direction, and the surge protection unit and the terminal cover are attached to each terminal block.