What is a Changeover Switch & Disconnectors?

A changeover switch and disconnectors are both electrical devices used in power distribution systems, but they serve slightly different purposes.

  1. Changeover Switch:
    • A changeover switch, also known as a transfer switch, is a device used to switch the power supply from one source to another. It allows for the seamless transition of power supply from one system to another, typically used in situations where backup power is necessary.
    • Changeover switches are commonly used in situations such as switching between mains power and generator power during power outages or maintenance. They ensure uninterrupted power supply to critical systems or equipment.
    • These switches can have multiple positions, allowing for various configurations of power sources and loads. They are often manually operated, although some can be automatic, sensing power failures and switching to backup power automatically.
  2. Disconnectors:
    • Disconnectors, also known as isolators or isolating switches, are used to isolate a circuit or equipment from the power supply. They are primarily used for safety purposes, allowing maintenance or repair work to be carried out on electrical equipment without the risk of electric shock or damage.
    • Disconnectors provide a physical break in the circuit, ensuring that no current flows through the equipment while it is being worked on.
    • Unlike changeover switches, disconnectors typically have only two positions: open (off) and closed (on). When in the open position, they physically disconnect the circuit, preventing the flow of electricity.
    • Disconnectors are commonly used in conjunction with circuit breakers and other protective devices to ensure safe operation of electrical systems.

In summary, while both changeover switches and disconnectors are used in electrical systems, changeover switches are primarily used to switch between different power sources, while disconnectors are used to isolate equipment for maintenance or safety purposes.