How does a push button on off switch work?

A push button switch is a small, sealed mechanism that completes an electric circuit when you press on it. When it’s on, a small metal spring inside makes contact with two wires, allowing electricity to flow. When it’s off, the spring retracts, contact is interrupted, and current won’t flow.

What is push button control?

A Push Button switch is a type of switch which consists of a simple electric mechanism or air switch mechanism to turn something on or off. The button itself is usually constructed of a strong durable material such as metal or plastic. Push Button Switches come in a range of shapes and sizes.

What does a push button do in a circuit?

A ‘push to make’ switch allows electricity to flow between its two contacts when held in. When the button is released, the circuit is broken. This type of switch is also known as a Normally Open (NO) Switch. (Examples: doorbell, computer case power switch, calculator buttons, individual keys on a keyboard)

How does the control circuit remain on after the start push button is released?

The three-wire control circuit is the most widely used motor control circuit. This control circuit gets its name because of the auxiliary contacts that are connected in parallel with the start button. The auxiliary contacts seal in the circuit to keep the coil energized after the start push button is released.

How are the buttons on a contactor closed?

When the coil is energized, the circuit that the contactor is switching will be energized. In the above example, there are two start, and two stop buttons (in brown – fig2) in the supply to the coil (black zigzag – fig2). To close the contactor (to energize the switched circuit), one of the two start buttons (in green – fig2) must be pressed.

How does a contactor control an electric motor?

Perhaps the most common industrial use for contactors is the control of electric motors. The top three contacts switch the respective phases of the incoming 3-phase AC power, typically at least 480 Volts for motors 1 horsepower or greater.

Why is my AC contactor not pulling in?

10 Reasons why the Air Conditioner Contactor is not pulling in: The furnace power switch or the air handler breaker might be turned off. The furnace door might be loose and allowing the door safety switch to not be engaged. Make sure the furnace power switch is on and your furnace blower door is on tight.

What happens when a contactor is switched off?

To open the contactor (to de-energize the switched circuit), one of the stop buttons must be pressed. The circuit to the coil will become broken, de-energising the coil. The supply that the contactor is switching (grey cables fig1) will therefore be switched off. (See AC motor section at the bottom of this page).