For MasterPact circuit breakers, including MasterPact NW, source changeover can typically be achieved using additional accessories and control devices. Here's a general guide on how to implement source changeover with MasterPact circuit breakers:

1. Selection of Accessories: Check for compatible accessories designed for source changeover operations. These accessories may include:
   • Mechanical or electrical interlocks: These devices ensure that only one power source is connected to the load at a time, preventing back-feeding or parallel operation.
   • Transfer switches: Automatic or manual transfer switches facilitate the transition between power sources, providing a seamless transfer of electrical supply.
2. Installation: Install the MasterPact circuit breaker(s) 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 in accordance with the desired sequence and timing. This may involve programming control devices, setting delay times, and specifying source priorities.
4. Testing: Conduct thorough testing and commissioning of the source changeover system to verify its functionality and reliability. Test the system under various scenarios, 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 needed. Follow the 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. Perform 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 MasterPact circuit breakers, ensuring uninterrupted power supply in your electrical distribution system.