What Is the Function of Push Button Switch?

The push button switch is a control switch with spring energy storage reset. The current allowed to pass through the contacts of the push button switch is small, generally not exceeding 5A. The function of the push button switch is mostly used on some CNC machine tools or machinery with obvious functional classifications. Each push button switch has two pairs of contacts. Each pair of contacts consists of a normally open contact and a normally closed contact. When the button is pressed, two pairs of contacts will act simultaneously: the normally closed contact opens and the normally open contact closes. The main parameters, type, mounting hole size, number of contacts and current capacity of the contacts of the different push button switches are shown in the product description of Bulk Switch Marts.

Push button switches can complete basic controls such as start, stop, speed change and interlock. In order to indicate the function of each button and avoid misoperation, the button caps are usually made into different colors. Common colors include red, green, black, yellow, blue, white, etc. Generally speaking, red indicates the stop button, green indicates the start button, etc. Some button switch manufacturers will make the button caps into different colors for easy identification. Some more personalized switches will add LED lights to the circuit under the button caps, and engrave different logo patterns on the button caps. Push button switches with LEDs are generally called signal indicators. In addition to color, there are many types of mounting cut holes for push button switches. Our store provides 12, 16, 19, and 22mm push button switch for you to choose from.

Under normal circumstances, the push button switch does not directly control the on and off of the main circuit (large current circuit). But only sends out command signals in the control circuit (low current circuit) to control electrical appliances such as contactors and relays. Then these electrical appliances control on-off, function conversion, or electrical interlocking of the main circuit.

Buttons generally consist of button caps, return springs, movable contacts, static contacts, pillar connecting rods and shells.

When the button is not affected by external force, the opening and closing status of the contact is divided into stop button, start button and composite button:

function of push button switch

When the button is acted upon by an external force, the opening and closing status of the contacts changes:

push button switch function

The core function of a push button switch is to provide a simple way to turn a circuit on or off. This is usually done by pressing a button on the switch. Push button switches have electrical contacts inside that are either normally open (NO) or normally closed (NC). In the “normally open” state, the switch is open and current cannot flow. In the normally closed state, the switch is closed, allowing current to pass. When you press a button on a push-button switch, the switch’s internal mechanism changes the state of the contacts when the button is pressed. If in NO state, it switches to NC when pressed and vice versa. When the switch is in the closed state (NC), current can flow through it, powering connected devices or circuits. When the switch is in the off state (NO), current flow is interrupted and the device turns off.

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