Nason Switches
Snap action switches for precise, repeatable control
One Switch. Countless Applications.
Engineers choose Nason for accurate, long-life switching and easy integration in industrial automation, with applications ranging from backup horns on forklifts to braking and steering controls in military vehicles to everyday manufacturing lines. Choose a diaphragm switch for low to medium pressures or a piston switch for higher ranges to get crisp on/off performance and consistent set points. Every unit is configurable with broad media and electrical connection options.
Pressure Switches
Low through high-pressure models cover roughly 2 to 7,500 psi with diaphragm or piston sensing, adjustable or preset set points, and multiple media and electrical connection options for pneumatic and hydraulic systems.
Temperature Switches
Mechanical temperature switches designed for reliable, repeatable actuation across a wide range of applications, featuring broad electrical connection options, recognized industry approvals, and durable construction for long-term performance.
Vacuum Switches
Factory-preset or field-adjustable models cover approximately 1 to 28 inches Hg and are available in NEMA 4 and NEMA 13 constructions, with multiple port and electrical connection options for vacuum control and monitoring applications.
Electrical Options
Match your wiring standard with sealed connectors, conduit entries, quick connects, wire leads, DIN styles, M12, Deutsch, Metri-Pack, Weather Pack, and other popular connection types. This broad selection simplifies installation, supports existing electrical architectures, and helps ensure reliable integration across a wide range of industrial and mobile equipment applications.
Snap-action accuracy
Nason pressure switches use a snap-action mechanism actuated by either an elastomer diaphragm or a piston. This proven design eliminates creep at the set point, delivering fast, repeatable switching performance. The sensing element moves a precise 0.040 inches to ensure instantaneous contact actuation and reliable operation throughout the life of the switch.
Built for a long service life
Under typical operating conditions, Nason switches are rated for more than one million cycles, helping reduce maintenance requirements, minimize downtime, and lower total cost of ownership over the life of the equipment. To ensure consistent performance and reliability, every unit is individually tested for accuracy and proper operation before leaving our facility.
Wide pressure coverage
From low to high pressure, models span set points from approximately 2 psi up to 7,500 psi, with both adjustable and factory-preset versions available to match specification and validation requirements. A wide range of pressure ranges and configuration options makes integration easy in virtually any pneumatic or hydraulic system.
Connection options that fit your design
Choose from a large catalog of media connections including NPT, BSP, SAE, JIS, DIN, and MS, along with electrical connection options such as M12, Deutsch, Metri-Pack, Weather Pack, DIN, sealed connectors, and conduit styles. This broad compatibility simplifies installation and integration across a wide range of industrial, mobile, pneumatic, and hydraulic applications.
Sealed and rugged
Models are available in NEMA 4 and NEMA 13 constructions for harsh environments, providing dependable performance in wash-down areas, dust-laden facilities, and outdoor applications. Rugged housings and durable components help protect against contaminants while maintaining reliable operation in demanding industrial conditions.
Recognized approvals
Multiple switch families carry UL, CSA, and select military approvals to support specification in regulated and mission-critical applications. These recognized certifications help simplify compliance requirements while providing added confidence in performance, quality, and long-term reliability across demanding operating environments.
Configure your switch
Know what you need? Use our online tool to build the right switch for your application. Select sensing type, set point, materials, media and electrical connections, then generate a model number and CAD instantly.
Ready to test a sample?
Validate the fit, function, and switching behavior on your equipment before you commit. Request a pressure, temperature, or vacuum switch sample configured to your specifications.
Frequently Asked Questions (FAQs)
What is a snap action switch?
A snap action switch uses an over-center mechanism that moves from one electrical state to the other almost instantly at a precise set point, rather than creeping gradually. In Nason designs, the sensing element’s controlled travel produces crisp contact change and repeatable switching suitable for industrial automation.
How does the snap-action mechanism operate in Nason pressure, vacuum, and temperature switches?
Pressure and vacuum models use either an elastomer diaphragm or a sealed piston to drive the snap mechanism. Contacts stay open or closed until the exact set point is reached, then snap to the other state and remain there until the differential is crossed in the opposite direction. Temperature models work the same way as limit sensors, opening or closing when the defined temperature set point is reached.
Which sensing element should I choose: diaphragm or piston?
Choose a diaphragm when you need sensitivity and stability at low to medium pressures, especially in pneumatic systems and clean media. Select a piston for higher pressures and rugged hydraulic service where a sealed, wear-resistant sensor is preferred. Nason’s high-pressure families typically use sealed pistons, while many low-pressure families use long-life elastomer diaphragms.
What set point ranges are available for pressure, temperature, and vacuum models?
Nason pressure switches span approximately 2 to 7,500 psi across low-, mid-, and high-pressure families, with model-specific tolerances. Vacuum switches cover roughly 1 to 28 inches Hg depending on model and whether the unit is fixed or adjustable. Temperature switches include models with factory-set points across common industrial ranges. Confirm the exact range on the product page or catalog sheet for your chosen series.
What is deadband, and how do I select the right value?
Deadband, also called differential, is the separation between the actuation and reset points. It prevents chattering in systems with pressure or temperature ripple. Choose narrower differentials for tight control in stable systems and wider differentials when shock, pulsation, or noise is present.
Are the switches field adjustable or factory preset?
Both are available. Nason offers field-adjustable options in several pressure and vacuum families and factory-preset versions when you prefer tamper resistance or a validated setting from the factory. The catalog and product pages identify which series are adjustable versus fixed, along with the available adjustment ranges.
Which electrical connections and contact forms are available?
Common contact forms include SPDT and SPST normally open or normally closed. Connection options include wire leads, spade quick connects, DIN 43650A, M12, Deutsch, Metri-Pack, Weather Pack, and 1/2 in. conduit entries, among others. The Electrical Options guide shows the full menu, pin assignments, and typical IP ratings by connector.
What is the typical lead time for samples or production units?
Inventory-reducing build practices keep lead times short. Samples can usually be assembled and shipped quickly, but please consult the factory for exact lead times.