| 摘要 |
In the case where a printed board is contained in a casing of an electrical junction box, and where electrical components such as relays disposed on the printed board are connected to a bus bar disposed in the casing, a heat generated in the bus bar is uniformed in the casing without causing an uneven heat distribution around the bus bar, thereby requiring no means for radiating the bus bar. An electrical junction box including a casing, a printed board contained in the casing, an insulation plate disposed on the printed board, a bus bar mounted on the insulation plate, and a relay mounted on the printed board. The bus bar is provided with an electrical power source terminal to be connected to an electrical power source side. Branched portions provided on the bus bar are connected to a conductor on the printed board, respectively. A terminal of the relay is connected to the printed board conductor connected to the branched portions of the bus bar. The relay terminal is connected through the printed board conductor to the bus bar.
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