| 摘要 |
A magnetic switch having a main motor switch for supplying power from a battery to a starter motor and an auxiliary relay for operating the motor switch is mounted on the starter motor. The main motor switch includes copper contacts switching a large amount of starter current, and the auxiliary relay includes contacts switching only a small amount of current sufficient to operate the main motor switch. The auxiliary relay is separated from the main motor switch by a wall to protect the auxiliary relay, especially its contacts from copper dusts generated in switching operation of main motor switch. Since the auxiliary relay is kept free from the copper dusts, the magnetic switch properly functions for a long time.
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