The Honeywell 11SM77-H58 is a precision snap-action switch featuring a plastic plunger actuator. Designed for demanding industrial applications, this switch offers reliable performance and long life. The mating contact surfaces are finished with a 24K solid gold overlay, ensuring low contact resistance and excellent signal transmission. The switch is capable of withstanding temperatures up to 250°F and is suitable for use in a wide range of electrical circuits. Mounting holes accept pins or screws of .087 max diameter, providing flexibility in installation. This switch is a direct replacement for PR-17309.