The CYK4 is a knife disconnect terminal block designed for safe and efficient circuit isolation and testing in control panels and automation systems. It allows users to isolate circuits without removing wires, enabling faster and safer maintenance. Circuit disconnection and isolation are achieved by lifting the orange knife lever with a standard screwdriver, providing an intuitive and secure method that enhances safety during testing. An integrated test point also allows for easy voltage or continuity checks without interrupting the wiring, further simplifying troubleshooting and maintenance tasks.