Summary of button switches commonly used by electricians, let's increase knowledge together
1.The function of the push switch A push switch is a control switch that is operated by applying force from a certain part of the human body (usually fingers or palm) and has a spring energy storage reset. It is the most commonly used master electrical appliance. The current allowed to pass through the contact of the switch is small, generally not more than 5A. Therefore, in general, it does not directly control the on-off of the main circuit (high-current circuit), but sends a command signal in the control circuit (small-current circuit) to control electrical appliances such as contactors and relays, and then they control the main circuit. On-off, function conversion or electrical interlocking.
2.The structure principle and symbol of the switch The push switch is generally composed of a switch cap, a return spring, a bridge-type moving contact, a static contact, a strut link and a shell. The opening and closing state of the contacts when the switch is not affected by external force (that is, static), is divided into stop switch (that is, moving and breaking switch), start switch (that is, moving and closing switch) and reset switch (that is, that the combination of moving and closing contacts is as follows: integrated switch).
When the switch is under the action of external force, the opening and closing state of the contact changes:
3. The meaning of the switch color
What is a normally closed switch?
What is a normal open switch?
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