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ON-OFF, SPST Rocker Switch Function and Wiring

ON-OFF, SPST Rocker Switch Function

An ON-OFF, SPST (Single Pole Single Throw) rocker switch is one of the simplest types of switches. It has the following characteristics:

  1. Functionality:
    • Single Pole: It controls a single circuit.
    • Single Throw: It has one pair of contacts that can either be closed (ON) or open (OFF).
  2. Operation:
    • In the ON position, the switch completes the circuit, allowing current to flow through.
    • In the OFF position, the switch breaks the circuit, stopping the flow of current.
  3. Applications:
    • Commonly used in household appliances, automotive, and various electronic devices to control power.

Wiring an ON-OFF, SPST Rocker Switch

Wiring a rocker switch is straightforward. Here’s a basic guide:

  1. Identify the Terminals:
    • COM (Common): The input terminal where the power source is connected.
    • NO (Normally Open): The output terminal where the load (device) is connected.
  2. Steps for Wiring:
    1. Turn Off Power: Always ensure the power source is turned off before wiring to avoid electric shock.
    2. Connect the Power Source:
    3. Connect the Load:
      • Attach the wire from the NO terminal of the switch to the positive terminal of the load (e.g., a light bulb).
    4. Complete the Circuit:
      • Connect the negative terminal of the power source directly to the negative terminal of the load.
  3. Example Wiring Diagram:
    Rocker Switch Wiring Diagram

Practical Example

If you are wiring a rocker switch to control an LED light:

  1. Connect the positive terminal of the battery to the COM terminal of the switch.
  2. Connect the NO terminal of the switch to the positive terminal of the LED.
  3. Connect the negative terminal of the battery directly to the negative terminal of the LED.

When the switch is flipped to the ON position, the circuit is completed, and the LED lights up. When flipped to the OFF position, the circuit is broken, and the LED turns off.

Safety Tips

  • Always double-check connections to ensure proper wiring.
  • Use appropriate wire gauges for the current load.
  • Insulate all connections to prevent short circuits and potential hazards.

By understanding these basics, you can confidently wire an ON-OFF, SPST rocker switch for various applications.

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