The Banner Engineering OTBVR81QD is an optical touch button in the OPTO-TOUCH OTB Series that provides a momentary-action input with a SPDT electromechanical relay output for machine control. It operates from 20–30 V AC or DC and uses a 5-pin Mini QD quick-disconnect, with single-point optical sensing. For the QD variant, the upper housing is None and it is designed for base-mount/saddle panel installation on industrial equipment.
