Push button switch based on materials, it can be divided into plastic push button and metal push button. Metal materials includes stainless steel, brass plated nickel, aluminum oxide. Push button switch is a switch that USES the push button to push the transmission mechanism to make the moving contact and the static contact on or off and realize circuit switching. In the electric automatic control circuit, it is used to send out the control signal manually to control the contactor, relay, electromagnetic starter and so on. Because of the different application devices and functions, there is difference of colors, voltages, with light or not, momentary or latching, mounting hole diameter, switch function and shapes. Specific application examples is the elevator button, medical apparatus and instruments, commercial kitchen utensils and appliances, security door, coffee maker and so on. And by the way, some special symbol can be made.
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