The 91A1A-B24-B20L is a 5/8" square single-turn panel control potentiometer manufactured by Bourns, designed for applications requiring virtually infinite electrical circuit isolation. This model features multiple available pin-out configurations and offers both metal and plastic shaft options to accommodate various installation requirements. The potentiometer is available with either conductive plastic or cermet resistance elements, supporting standard resistance ranges from 100 ohms to 1 megohm with linear or audio taper options. With total resistance tolerance options of 5% to 20% and independent linearity of ±5%, this component is suitable for audio equipment, instrumentation panels, and industrial control systems where reliable variable resistance adjustment is needed. The product is RoHS compliant, ensuring environmental compliance for modern electronic applications.