The P270-DS21R5K is a 27mm panel-mount rotary potentiometer designed for heavy-duty applications requiring long operational life. It features a conductive plastic element with a resistance range of 1K to 1M ohms (depending on taper), ±10% tolerance, and a maximum residual resistance of 6 O. The device is rated for 1 million cycles at 10% resistance change, operates across -55°C to +120°C, and supports input voltages up to 500 Vdc with a power rating of 1 Watt (or 2 Watts for B-taper at 70°C). With a total mechanical travel of 312°±5°, sealed construction option, and RoHS compliance, this potentiometer is ideal for industrial control panels, instrumentation, and applications demanding durability and reliability in harsh environments.