Mainly consists of the following 5 categories:
① for making and breaking circuits of electrical appliances, such as contactors, knife switches, load switches, disconnectors, circuit breakers, etc.
II used to control electrical circuits, such as electromagnetic starter, autotransformer starters, rheostats, control relays, etc.
③ for switching circuit of the appliance, such as switches, electrical, etc.
④ coefficient of detection circuit for electrical appliances, such as transformers, sensors, etc.
⑤ for protective circuit of electrical appliances, such as fuses, circuit breakers, surge arrester, etc.
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