What is relay type vdg cdg vtt ect?

Relay types such as VDG (Voltage-Driven Gate), CDG (Current-Driven Gate), and VTT (Voltage-Tolerant Trigger) refer to different methods of controlling relay operation based on varying electrical signals. VDG typically responds to specific voltage levels, CDG is triggered by current levels, and VTT is designed to tolerate a range of input voltages while still functioning effectively. Each type serves different applications in electronic circuits, depending on the requirements for sensitivity and control.