The 91R1A-J22-B15L is a Model 91 single-turn panel control potentiometer manufactured by Bourns, featuring a 5/8" square form factor with virtually infinite electrical circuit isolation. This unit is available with either conductive plastic or cermet resistive elements, supporting resistance ranges from 100 ohms to 1 megohm depending on element type and taper configuration. The potentiometer offers independent linearity of ±5%, total resistance tolerance options of 0.10% or 20% (conductive plastic) or 5% to 10% (cermet), and an absolute minimum resistance of 2 ohms maximum. It is RoHS compliant and available in multiple pin-out configurations with metal or plastic shaft options. These potentiometers are commonly used in audio equipment, instrumentation panels, and control systems where precise resistance adjustment and reliable isolation are required.