JP4297299B2 - Electrical junction box - Google Patents

Electrical junction box Download PDF

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Publication number
JP4297299B2
JP4297299B2 JP01430299A JP1430299A JP4297299B2 JP 4297299 B2 JP4297299 B2 JP 4297299B2 JP 01430299 A JP01430299 A JP 01430299A JP 1430299 A JP1430299 A JP 1430299A JP 4297299 B2 JP4297299 B2 JP 4297299B2
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JP
Japan
Prior art keywords
fuse
wiring board
housing
wiring
connecting terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP01430299A
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Japanese (ja)
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JP2000215784A (en
Inventor
久雄 本間
敏孝 原
重太郎 向井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
THE FURUKAW ELECTRIC CO., LTD.
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THE FURUKAW ELECTRIC CO., LTD.
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Priority to JP01430299A priority Critical patent/JP4297299B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H2085/2075—Junction box, having holders integrated with several other holders in a particular wiring layout
    • H01H2085/208—Junction box, having holders integrated with several other holders in a particular wiring layout specially adapted for vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H2085/2085—Holders for mounting a fuse on a printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/203—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals
    • H01H85/2035—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals for miniature fuses with parallel side contacts

Description

【０００１】
【発明の属する技術分野】
本発明は、配線基板およびヒューズなどを備えた自動車等の電気接続箱に関する。
【０００２】
【従来の技術】
従来、電気接続箱に用いられる小電流ヒューズは、例えば図３（ａ）に示すようなヒューズホルダー１を用いて配線基板に接続されている。このヒューズホルダー１は樹脂成形体に、配線基板に位置決めするための位置決めピン１ａと、配線基板と電気的に接続する端子１ｂ、およびヒューズの端子が挿入されるリセプタクル部１ｃを設けたものである。このヒューズホルダー１は、図３（ｂ）に示すように、小電流ヒューズ３の端子３ａのリセプタクル部１ｃへの挿入方向が配線基板２に平行になるように、配線基板２に組付けられる。
【０００３】
また、中電流ヒューズは、例えば図４に示すようなヒューズ接続端子４を用いて配線基板２に接続されている。このヒューズ接続端子４は配線基板２に起立するように半田付けして設けられたオス端子からなり、中電流ヒューズ５は配線基板２に垂直にヒューズ接続端子４に挿入される。
【０００４】
【発明が解決しようとする課題】
しかしながら、従来の電気接続箱用のヒューズホルダーには、次のような問題があった。即ち、
１）小電流ヒューズ３に対しては、一個のヒューズ３に対して一個のヒューズホルダー１を要し、ヒューズ３の数が増えると、部品点数が増えるとともに、ヒューズホルダー１の配線基板２への組付け工数も増える。
また、配線基板２にヒューズホルダー１を組付けるための多数の穴を開けると、配線基板２の配線パターン形成が困難になるとともに、配線基板２の強度が低下する。
さらに、配線パターン形成を容易にし、配線基板２の強度を保持するために、ヒューズホルダー１の組付けの間隔を広げると、配線基板２が大型化する。
【０００５】
２）中電流ヒューズ５をヒューズ接続端子４に挿抜すると、挿抜力がヒューズ接続端子４と配線基板２の半田付け部分に加わり、ヒューズ接続端子４と配線基板２の接続の信頼性を損なう恐れがある。
【０００６】
【課題を解決するための手段】
本発明は配線基板と、複数のヒューズと、前記ヒューズに接続する、両端に端子を備えた複数のヒューズ接続用端子部材と、前記複数のヒューズ接続用端子部材をヒューズハウジング本体に固定し、配線基板に接続されるヒューズハウジングと、前記ヒューズハウジング及び前記配線基板に被せられたヒューズカバーと、を備え、前記ヒューズハウジングは、前記配線基板の所定の面上に取り付けられ、前記ヒューズ接続用端子部材はＬ字形をなし、Ｌ字形の一方側の端子が前記配線基板に直角方向ではんだ接続されており、Ｌ字形の他方側の端子が、前記配線基板に対して平行となるように、前記ヒューズハウジングに貫通固定されており、
前記ヒューズハウジングを備えた２枚の前記配線基板を対向配置させて、１つのヒューズカバーに固定し、前記ヒューズは、前記ヒューズカバーを貫通し、前記配線基板に対して平行となるように保持されて、前記ヒューズ接続用端子部材のＬ字形の他方側の端子に、前記配線基板に対して平行な方向に接続して、前記配線基板に前記ヒューズ接続用端子部材を介して電気的に接続されており、前記ヒューズハウジング本体は、固定されるヒューズの個数にかかわらず共用化されることができることを特徴とするものである。
【０００７】
上述のように、本発明によれば、複数のヒューズ接続用端子部材を組付けたヒューズハウジングを配線基板に取り付けるため、配線基板に直接取り付ける部品点数が減り、取り付け工数も減る。
また、配線基板に設けるヒューズハウジング取り付け用などの穴の数は、従来のヒューズホルダーの数だけ設けていた穴の数に比較して少なくなり、配線基板の配線パターン形成が容易になるとともに、配線基板の強度の低下や大型化を招くこともなくなる。
さらに、前記ヒューズカバーを貫通し、前記配線基板に対して平行となるように保持されたヒューズは、一方側の端子が前記配線基板に直角方向ではんだ接続されたＬ字形の前記ヒューズ接続用端子部材の他方側の端子に、前記配線基板に対して平行な方向に接続して、前記配線基板に前記ヒューズ接続用端子部材を介して電気的に接続しているため、ヒューズの挿抜力やヒューズに加わる外力はヒューズハウジング本体とヒューズカバーに受け止められ、ヒューズ接続用端子部材と配線基板とのはんだ接続部に作用することはない。
【０００８】
【発明の実施の形態】
以下、図面に基づいて本発明の実施の形態を詳細に説明する。
図１は、本発明にかかる電気接続箱の一実施形態の分解斜視図である。図１において、図３、４に関して説明した部分と同部分は同符号で指示してある。
ヒューズハウジング１４は、小電流用のヒューズ接続用端子部材１１を組付けたヒューズハウジング本体１３ａと、中電流用ヒューズ接続用端子部材１２を組付けたヒューズハウジング本体１３ｂとからなる。なお、ヒューズハウジング本体１３ａ、１３ｂは一体に形成され、ヒューズハウジング本体１３を形成している。
小電流用のヒューズ接続用端子部材１１は、図２に示すように、Ｌ字形をして、両端に小電流ヒューズ３に接続する音叉形端子１１ａと、配線基板２にはんだ接続する端子１１ｂが形成されている。また、中電流用のヒューズ接続用端子部材１２はＬ字形をした板状のものである。
【０００９】
ヒューズカバー１８は、ヒューズハウジング本体１３に組付けられたヒューズ接続用端子部材１１、１２の配列に合わせて、ヒューズカバー本体１７に貫通穴（図示されず）部が設けられ、これらの貫通穴部に小電流用のヒューズ保持部品１５と中電流用のヒューズ保持部品１６を組付けたものである。
小電流用のヒューズ保持部品１５は、小電流ヒューズ３の形状に合わせたコの字形状をなしている。また、中電流用のヒューズ保持部品１６は、中電流ヒューズ５の形状に合わせた四角筒形状をしており、ヒューズ５の挿入側に拡がるようにテーパがついている。ヒューズ保持部品１５、１６は、ヒューズ３、５をヒューズ接続用端子部材１１、１２に接続する際にガイドするとともに、接続したヒューズ３、５を保持する。
【００１０】
ヒューズハウジング１４は、小電流ヒューズ３および中電流ヒューズ５の挿入方向が配線基板２面と平行になるように、配線基板２に取り付けられ、ヒューズ接続用端子部材１１、１２の配線基板２に接続する端子が配線基板２にはんだ付けされている。
ヒューズカバー１８は、対向するように配置された２枚の配線基板２に取り付けられた２個のヒューズハウジング１４にかぶせられ、ヒューズハウジング本体１３に取り付けられたヒューズ接続用端子部材１１、１２がヒューズカバー１８のヒューズ保持部品１５、１６を貫通する。
なお、ヒューズハウジング１４には位置決め用の穴（図示されず）が設けられており、また、ヒューズカバー１８には位置決め用のピン（図示されず）とロック爪（図示されず）が設けられており、前記穴に前記ピンをロックさせて、ヒューズハウジング１４にヒューズカバー１８を固定する。
小電流ヒューズ３および中電流ヒューズ５は、ヒューズ保持部品１５、１６に挿入、ガイドされてヒューズ接続用端子部材１１、１２の端子に接続し、保持される。なお、図１では、対向するように配置される同一配線パターンの２枚の配線基板２のうちの一枚を省略している。
【００１１】
上記実施形態によれば、配線基板２にはヒューズハウジング１４を取り付けるのみであり、取り付けに要する部品点数および工数が少なくなる。
また、それにともない、配線基板２に設ける取り付け用の穴の数も減るため、配線基板２の配線パターン形成が容易になるとともに、配線基板２の強度の低下や大型化を招くこともなくなる。
さらに、ヒューズ接続用端子部材１１、１２はヒューズハウジング本体１３に組付けられ、ヒューズ３、５はヒューズ保持部品１５、１６で保持されている。そのため、ヒューズ３、５のヒューズ接続用端子部材１１、１２への挿抜力やヒューズ３、５に加わる外力はヒューズハウジング本体１３やヒューズ保持部品１５、１６で受け止められ、ヒューズ接続用端子部材１１、１２と配線基板２とのはんだ接続部に作用することがなく、その接続部の信頼性が損なわれることもない。
【００１２】
なお、本実施形態では、対向配置される２枚の配線基板２は同一配線パターンで、ヒューズの使用個数は同じであるが、対向配置される２枚の配線基板のヒューズの使用個数が異なる場合でも、不要なヒューズ接続用端子部材をヒューズハウジング本体に組付けず、かつ、ヒューズカバーからも不要なヒューズ部品を除くことにより対応できるので、ヒューズハウジング本体を共用し、ヒューズハウジング本体作製用の金型費を削減することができる。
【００１３】
【発明の効果】
以上説明したように本発明によれば、配線基板に取り付ける部品点数および取り付け工数が減り、また、配線基板の配線パターン形成が容易になるとともに、配線基板の強度の低下や大型化を防ぎ、さらに、配線基板とのはんだ接続部の信頼性が向上するという優れた効果がある。
【図面の簡単な説明】
【図１】本発明にかかる電気接続箱の一実施形態の分解斜視図である。
【図２】ヒューズ接続用端子部材の斜視図である。
【図３】（ａ）、（ｂ）はそれぞれ、従来のヒューズホルダーの斜視図および前記ヒューズホルダーを配線基板に組付けた状態の斜視図である。
【図４】従来のヒューズ接続端子を配線基板に組付けた状態の斜視図である。
【符号の説明】
２ 配線基板
３、５ ヒューズ
１１、１２ ヒューズ接続用端子部材
１１ａ、１１ｂ 端子
１３、１３ａ、１３ｂ ヒューズハウジング本体
１４ ヒューズハウジング
１５、１６ ヒューズ保持部品
１７ ヒューズカバー本体
１８ ヒューズカバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrical connection box of an automobile or the like provided with a wiring board and a fuse.
[0002]
[Prior art]
Conventionally, a small current fuse used in an electrical junction box is connected to a wiring board using a fuse holder 1 as shown in FIG. The fuse holder 1 has a resin molded body provided with positioning pins 1a for positioning on a wiring board, terminals 1b that are electrically connected to the wiring board, and receptacle portions 1c into which fuse terminals are inserted. . As shown in FIG. 3B, the fuse holder 1 is assembled to the wiring board 2 so that the insertion direction of the terminal 3 a of the small current fuse 3 into the receptacle part 1 c is parallel to the wiring board 2.
[0003]
Further, the medium current fuse is connected to the wiring board 2 using, for example, a fuse connection terminal 4 as shown in FIG. The fuse connection terminal 4 is a male terminal soldered to stand on the wiring board 2, and the medium current fuse 5 is inserted into the fuse connection terminal 4 perpendicularly to the wiring board 2.
[0004]
[Problems to be solved by the invention]
However, the conventional fuse holder for an electrical junction box has the following problems. That is,
1) For a small current fuse 3, one fuse holder 1 is required for one fuse 3. As the number of fuses 3 increases, the number of parts increases and the fuse holder 1 is connected to the wiring board 2. The assembly man-hours also increase.
If a large number of holes for assembling the fuse holder 1 are formed in the wiring board 2, it is difficult to form a wiring pattern on the wiring board 2 and the strength of the wiring board 2 is reduced.
Furthermore, in order to facilitate the formation of the wiring pattern and maintain the strength of the wiring board 2, the wiring board 2 becomes larger when the interval between the assembly of the fuse holders 1 is increased.
[0005]
2) When the medium current fuse 5 is inserted into or removed from the fuse connection terminal 4, the insertion / extraction force is applied to the soldered portion of the fuse connection terminal 4 and the wiring board 2, and the reliability of the connection between the fuse connection terminal 4 and the wiring board 2 may be impaired. is there.
[0006]
[Means for Solving the Problems]
The present invention relates to a wiring board, a plurality of fuses, a plurality of fuse connecting terminal members having terminals at both ends connected to the fuse, and the plurality of fuse connecting terminal members fixed to a fuse housing body, A fuse housing connected to a substrate; and a fuse cover that covers the fuse housing and the wiring substrate , the fuse housing being mounted on a predetermined surface of the wiring substrate, and the fuse connecting terminal member Has an L-shape, one terminal of the L-shape is solder-connected to the wiring board at a right angle, and the other terminal of the L-shape is parallel to the wiring board. It is fixed to the housing through,
The two wiring boards provided with the fuse housing are arranged opposite to each other and fixed to one fuse cover, and the fuse is held so as to penetrate the fuse cover and be parallel to the wiring board. Te, wherein the terminals of the fuse connecting the other side of the L-shaped terminal members, connected in a direction parallel to the wiring substrate are electrically connected via the fuse connection terminal member to the wiring substrate The fuse housing body can be shared regardless of the number of fuses to be fixed.
[0007]
As described above, according to the present invention, since the fuse housing assembled with a plurality of fuse connecting terminal members is attached to the wiring board, the number of components directly attached to the wiring board is reduced, and the number of attachment steps is also reduced.
In addition, the number of holes for mounting the fuse housing in the wiring board is smaller than the number of holes provided in the conventional fuse holder, facilitating the formation of wiring patterns on the wiring board, and wiring. There is no reduction in the strength or size of the substrate.
Further, the fuse that passes through the fuse cover and is held parallel to the wiring board has an L-shaped fuse connection terminal in which one terminal is solder-connected to the wiring board in a direction perpendicular to the wiring board. Since it is connected to the terminal on the other side of the member in a direction parallel to the wiring board and is electrically connected to the wiring board via the fuse connecting terminal member , the insertion / extraction force of the fuse and the fuse The external force applied to the fuse housing is received by the fuse housing body and the fuse cover, and does not act on the solder connection portion between the fuse connecting terminal member and the wiring board.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view of an embodiment of an electrical junction box according to the present invention. In FIG. 1, the same parts as those described with reference to FIGS.
The fuse housing 14 includes a fuse housing main body 13a assembled with a small current fuse connecting terminal member 11 and a fuse housing main body 13b assembled with a medium current fuse connecting terminal member 12. The fuse housing main bodies 13a and 13b are integrally formed to form the fuse housing main body 13.
As shown in FIG. 2, the fuse connecting terminal member 11 for small current has an L shape, and has a tuning fork terminal 11 a connected to the small current fuse 3 at both ends, and a terminal 11 b connected to the wiring board 2 by soldering. Is formed. Further, the medium current fuse connecting terminal member 12 is an L-shaped plate.
[0009]
The fuse cover 18 is provided with through holes (not shown) in the fuse cover main body 17 according to the arrangement of the fuse connecting terminal members 11 and 12 assembled in the fuse housing main body 13. Are assembled with a fuse holding component 15 for small current and a fuse holding component 16 for medium current.
The fuse holding component 15 for small current has a U-shape corresponding to the shape of the small current fuse 3. Further, the medium current fuse holding component 16 has a rectangular tube shape that matches the shape of the medium current fuse 5, and is tapered so as to expand toward the insertion side of the fuse 5. The fuse holding parts 15 and 16 guide the fuses 3 and 5 when connecting them to the fuse connection terminal members 11 and 12 and hold the connected fuses 3 and 5.
[0010]
The fuse housing 14 is attached to the wiring board 2 so that the insertion direction of the small current fuse 3 and the medium current fuse 5 is parallel to the surface of the wiring board 2 and is connected to the wiring board 2 of the fuse connection terminal members 11 and 12. The terminal to be soldered is soldered to the wiring board 2.
The fuse cover 18 is put on two fuse housings 14 attached to two wiring boards 2 arranged so as to face each other, and the fuse connecting terminal members 11 and 12 attached to the fuse housing main body 13 are fuses. The fuse holding parts 15 and 16 of the cover 18 are penetrated.
The fuse housing 14 is provided with positioning holes (not shown), and the fuse cover 18 is provided with positioning pins (not shown) and lock claws (not shown). Then, the pin is locked in the hole, and the fuse cover 18 is fixed to the fuse housing 14.
The small current fuse 3 and the medium current fuse 5 are inserted and guided in the fuse holding parts 15 and 16, connected to the terminals of the fuse connection terminal members 11 and 12, and held. In FIG. 1, one of the two wiring boards 2 having the same wiring pattern arranged so as to face each other is omitted.
[0011]
According to the above embodiment, only the fuse housing 14 is attached to the wiring board 2, and the number of parts and man-hours required for attachment are reduced.
Accordingly, since the number of mounting holes provided in the wiring board 2 is reduced, the wiring pattern of the wiring board 2 can be easily formed, and the strength and size of the wiring board 2 are not reduced.
Further, the fuse connecting terminal members 11 and 12 are assembled to the fuse housing body 13, and the fuses 3 and 5 are held by fuse holding parts 15 and 16. Therefore, the insertion / extraction force of the fuses 3 and 5 to / from the fuse connecting terminal members 11 and 12 and the external force applied to the fuses 3 and 5 are received by the fuse housing body 13 and the fuse holding parts 15 and 16, 12 does not act on the solder connection part between the wiring board 2 and the wiring board 2, and the reliability of the connection part is not impaired.
[0012]
In the present embodiment, the two wiring boards 2 arranged opposite to each other have the same wiring pattern and the same number of fuses used, but the number of fuses used in the two wiring boards arranged opposite to each other is different. However, since it is possible to cope by removing unnecessary fuse parts from the fuse cover without attaching an unnecessary fuse connection terminal member to the fuse housing body, the fuse housing body can be shared and used for making the fuse housing body. The mold cost can be reduced.
[0013]
【The invention's effect】
As described above, according to the present invention, the number of parts to be attached to the wiring board and the number of mounting steps can be reduced, the wiring pattern of the wiring board can be easily formed, and the strength and size of the wiring board can be prevented from being reduced. There is an excellent effect that the reliability of the solder connection portion with the wiring board is improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of an electrical junction box according to the present invention.
FIG. 2 is a perspective view of a fuse connecting terminal member.
FIGS. 3A and 3B are a perspective view of a conventional fuse holder and a perspective view of a state in which the fuse holder is assembled to a wiring board, respectively.
FIG. 4 is a perspective view of a state in which a conventional fuse connection terminal is assembled to a wiring board.
[Explanation of symbols]
2 Wiring board 3, 5 Fuse 11, 12 Fuse connection terminal member 11a, 11b Terminal 13, 13a, 13b Fuse housing body 14 Fuse housing 15, 16 Fuse holding parts 17 Fuse cover body 18 Fuse cover

Claims (1)

配線基板と、複数のヒューズと、前記ヒューズに接続する、両端に端子を備えた複数のヒューズ接続用端子部材と、前記複数のヒューズ接続用端子部材をヒューズハウジング本体に固定し、配線基板に接続されるヒューズハウジングと、前記ヒューズハウジング及び前記配線基板に被せられたヒューズカバーと、を備え、
前記ヒューズハウジングは、前記配線基板の所定の面上に取り付けられ、
前記ヒューズ接続用端子部材はＬ字形をなし、Ｌ字形の一方側の端子が前記配線基板に直角方向ではんだ接続されており、Ｌ字形の他方側の端子が、前記配線基板に対して平行となるように、前記ヒューズハウジングに貫通固定されており、
前記ヒューズハウジングを備えた２枚の前記配線基板を対向配置させて、１つのヒューズカバーに固定し、
前記ヒューズは、前記ヒューズカバーを貫通し、前記配線基板に対して平行となるように保持されて、前記ヒューズ接続用端子部材のＬ字形の他方側の端子に、前記配線基板に対して平行な方向に接続して、前記配線基板に前記ヒューズ接続用端子部材を介して電気的に接続されており、
前記ヒューズハウジング本体は、固定されるヒューズの個数にかかわらず共用化されることができることを特徴とする電気接続箱。A wiring board, a plurality of fuses, a plurality of fuse connecting terminal members having terminals at both ends connected to the fuse, and the plurality of fuse connecting terminal members fixed to the fuse housing body and connected to the wiring board A fuse housing, and a fuse cover that covers the fuse housing and the wiring board ,
The fuse housing is mounted on a predetermined surface of the wiring board;
The fuse connecting terminal member has an L shape, one terminal of the L shape is solder-connected to the wiring board at a right angle, and the other terminal of the L shape is parallel to the wiring board. So as to be fixed to the fuse housing.
Two wiring boards provided with the fuse housing are arranged opposite to each other and fixed to one fuse cover,
The fuse passes through the fuse cover, is held so as to be parallel to the wiring board, on the other side of the terminal of the L-shaped of the fuse connection terminal member, parallel to said wiring board Connected in a direction and electrically connected to the wiring board via the fuse connecting terminal member,
The electrical connection box, wherein the fuse housing body can be shared regardless of the number of fuses to be fixed.
JP01430299A 1999-01-22 1999-01-22 Electrical junction box Expired - Fee Related JP4297299B2 (en)

Priority Applications (1)

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JP01430299A JP4297299B2 (en) 1999-01-22 1999-01-22 Electrical junction box

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Application Number Priority Date Filing Date Title
JP01430299A JP4297299B2 (en) 1999-01-22 1999-01-22 Electrical junction box

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JP2000215784A JP2000215784A (en) 2000-08-04
JP4297299B2 true JP4297299B2 (en) 2009-07-15

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002251952A (en) 2001-02-22 2002-09-06 Jst Mfg Co Ltd Fuse holder
JP2009153239A (en) * 2007-12-18 2009-07-09 Sumitomo Wiring Syst Ltd Electrical connection box

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