Merrill Manufacturing proudly offers Heavy-Duty Standard and Extra Heavy-Duty Pressure Switches. Our models are rated for 2 horsepower and 5 horsepower, respectively. They equipped with extra-large silver contacts and feature a heavy fiberboard bracket to withstand more heat. Standard HD wire connectors hold up to No.8  wire, while XHD easily connects No.4. Both are tightly secured with a brass tube with set screws. XHD options use a spacious 5.7-inch-by-5.3-inch case and offer ¾-inch conduit knockouts, making tedious wiring easy. Check out our switches today at or by calling 800-831-6962!