The JE-21 is a roller actuator designed for use with a basic switch. When installed with a compatible ISEI basic switch, it requires a maximum operating force of 6 ounces. The device is constructed with a corrosion-resistant steel (Type 302) actuator and bracket, and features an oil-impregnated bronze roller for smooth operation. Key mechanical characteristics include a minimum overtravel of 0.010 inches and a maximum differential travel of 0.016 inches, ensuring precise switch actuation in various control applications.