The RCK4-100-1 is a terminated cable accessory for providing control connections to Carlo Gavazzi's RK..C series solid state relays. It features a 4-pin connector with a 2.54mm pitch and 0.64' square pins, incorporating an integrated lockable mechanism for a secure connection. This cable is designed to mate with the TE Connectivity connector 3-640441-4, which can be paired with the strain relief cover 643075-4. Using this pre-terminated cable simplifies wiring and ensures reliable control signal input for the relays in various industrial applications.