For implementing source changeover with ComPacT NSX circuit breakers, you would typically need additional accessories and control devices designed specifically for source changeover operations. Here's a general guide on how to achieve source changeover with ComPacT NSX circuit breakers:

1. Selection of Accessories: Choose compatible accessories that are designed for source changeover operations. These accessories may include:
   • Mechanical interlocks: These devices ensure that only one power source is connected to the load at a time, preventing parallel operation and back-feeding.
   • Transfer switches: Automatic or manual transfer switches facilitate the transition between power sources, providing a seamless transfer of electrical supply.
2. Installation: Install the ComPacT NSX circuit breakers and the source changeover accessories according to the manufacturer's instructions and local electrical codes. Ensure proper wiring and connections between the circuit breakers, power sources, and loads.
3. Configuration: Configure the source changeover system to operate as desired, specifying the sequence of operations and timing parameters. This may involve programming control devices, setting delay times, and defining source priorities.
4. Testing: Perform comprehensive testing and commissioning of the source changeover system to verify its functionality and reliability. Test the system under various conditions, including normal operation, source failure, and source restoration, to ensure proper operation.
5. Operation: Once the source changeover system is installed and tested, it can be operated manually or automatically to switch between power sources as required. Follow established procedures for initiating and monitoring source changeover operations.
6. Maintenance: Regularly inspect and maintain the source changeover system to ensure continued reliability and performance. Check for signs of wear or damage, and replace components as needed. Conduct periodic testing and verification of the system's operation.

By following these steps and utilizing compatible accessories and control devices, you can implement a reliable source changeover system with ComPacT NSX circuit breakers, ensuring uninterrupted power supply in your electrical distribution system.