91A1A-B28-B10L is a single-turn panel control potentiometer from the Bourns Model 91 series, featuring a 5/8" square form factor with multiple pin-out configurations for flexible circuit integration. The device offers virtually infinite electrical circuit isolation and is available with metal or plastic shaft options to suit various mechanical requirements. It supports a wide range of resistance values from 100 ohms to 1 megohm depending on element type and taper selection, with independent linearity of ±5% and total resistance tolerance options of 5% or 10% for cermet elements. The potentiometer is RoHS compliant and designed for applications requiring reliable panel-mounted control in audio, instrumentation, and industrial equipment where precise resistance adjustment is needed.