● Switch output isolation gate, switch output isolation type safety gate, safety place on one side of the contact switch signal through the safety gate control or drive the field of intrinsic safety equipment work, intrinsic safety equipment such as solenoid valve, audible and visual alarm, etc.
● DRG-1701 One in and one out
● DRG-1721 Two in two out
● DRG-1704 One in and one out independent power supply