タイトルまたは説明

According to an external electrical signal and a desired, either manually or automatically switched on or off the circuit, continuously or intermittently changing the circuit parameters, in order to achieve the power switching circuit or non-object, control, protection, detection, transformation and adjustable electrical equipment. Popular appreciated that electrical power can be controlled is a kind of tool, the most typical feature is "on" and "off." In electrical contact elements played a most important role, its performance determines the whole appliance during operation of the key.