The ABB 1SDA064518R1 is a high-quality accessory designed for seamless integration with PR221, PR222, and PR222MP systems, specifically compatible with T4-T5 units. This auxiliary switch features a single changeover contact (1S51 NC) that provides a closed signal for tripped indication, enhancing the functionality and reliability of your electrical setup. With a UPC of 804325520959 and a consistent weight of 1 lb for both net and gross measurements, this product ensures durability and ease of installation. Ideal for industrial settings requiring precise operational accuracy and robust performance.