TR Manufacturing Auto Power Switching Unit Transfer Switch FB-JB-NA4300 1 Discover the reliability and efficiency of the TRM Auto Power Switching Unit Transfer Switch, model FB-JN-NA4300. Designed for seamless transitions, this unit ensures a quick and smooth switch between main and standby power sources, suitable for a wide range of applications. The robust construction and intuitive design highlight TRM's commitment to quality, providing you with a safe and dependable solution for your power needs. With its straightforward installation process, the TR Manufacturing Auto Power Switching Unit Transfer Switch is a practical choice for both residential and light commercial settings. The FB-JN-NA4300 model is a testament to TRM's dedication to innovation and customer satisfaction, offering a reliable standby power solution that is both cost-effective and easy to maintain.