| 摘要 |
PROBLEM TO BE SOLVED: To easily interconnect a plurality of relays with simple work. SOLUTION: A cylindrical part 16 and an engaging recessed part 18 are formed in a case 3 of each relay 2, and a cylindrical part 16 of one relay 2 is engaged with an engaging recessed part 18 of the other relay 2 when the plurality of relays 2 are interconnected. Thus, the plurality of relays 2 are interconnected. In this state, a communication passage 19, namely a hollow inside of the cylindrical part 16, and the engaging recessed part 18 are opened inside and outside the case 3, so that heat inside the case 3 is discharged to the outside through the communication passage 19 and the engaging recessed part 18.
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