A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. Model Applicability: passion_Pro Splendor_Plus Splendor_NXG Splendor_iSmart HF_DELUXE Pleasure Pleasure_SPL_Edn Maestro_Edge Duet Passion_X_Pro iSmart HF_Dawn