... to "OFF" position with a power failure*5V, 12V or 15V, or 24V dc operation*Simple drive circuit for TTL input commands ... requirements: 5V, 12V or 15V or 24V dc.Specifications:Aperture Size: 0.5 inchPower Requirements: 5V dc, 700 mA. Optional: 12V dc, 300 mA and ... 24V dc, 160 mAResponse Time: 15 mSecExpected Life ...