The 91C1A-D24-B10L is a 5/8" square single-turn panel control potentiometer manufactured by Bourns, designed for applications requiring electrical circuit isolation and reliable resistance control. This model features a conductive plastic element with a resistance range of 1 kO to 1 megohm in audio taper configuration, offering a total resistance tolerance of ±10% or ±20% and independent linearity of ±5%. The potentiometer is available with metal or plastic shaft options and provides virtually infinite electrical circuit isolation, making it suitable for audio equipment, instrumentation, and consumer electronics where precise volume or parameter adjustment is required. Its RoHS-compliant design ensures environmental compliance and reliability in modern electronic applications.