3/4″ Epoxy Sealed Snap Disc Thermostats

Senasys manufactures 3/4″ Epoxy Sealed Snap Disc Thermostats, like the 2570 series, is a unique thermostat switch designed for extended use in extreme environments. It is built using our patented metal sleeve rivet construction and sealed to protect against salt spray, water, moisture and heat.

custom options

Designed & manufactured to meet requirements of original equipment manufacturers worldwide.

high quality

Senasys products are 100% tested before they leave our facilities.


All of our snap disc units are UL approved (USR) and the 2511 family is also Canadian Standard approved (CNR).

made in u.s.a.

Designed & manufactured in Eau Claire, WI, U.S.A.

The 2570 series is a unique thermostat switch designed for extended use in extreme environments. It is built using our patented metal sleeve rivet construction and sealed to protect against moisture and heat. These sealed thermostats are highly versatile, carrying up to 15 Amps at 120VAC. The 3/4″ bi-metal thermodisc within is set to a precise temperature range between -21°-220°F (-29°-105°C). The temperature range determines when the thermal switch will close, or engage the electrical circuit, and when it will automatically reset, or open.

The 2570 Series 3/4″ Epoxy Sealed Snap Disc Thermostats are manufactured with a high temperature ceramic insulated base encased in a protective nylon boot. Devices are sealed, have a comparative tracking index of +600 per UL 746A and IEC 112; water absorption of 0% and exceptional heat resistance.

2570 Series Sealed Thermostats feature a patented metal sleeve rivet construction listed by many European approval agencies with 4mm over surface clearance current carrying parts to ground. The 3/4″ thermal element of the device with its fast response and sensitivity characteristics is processed to maintain close tolerances and narrow differential performance for extended life.


  • 3/4″ Bi-Metal Disc
  • Sealed thermostats meet MIL-STD-202 specification for humidity, moisture resistance, salt spray, freeze and thaw, and shock and vibration.
  • High environmental exposure temperature range of -21°-220°F (-29°-105°C).
  • Differential temperature range of 15-80°F (-9 – 25°C).
  • Automatic Reset
  • Single-pole, single-throw (SPST)
  • 15 Amps at 120VAC, 100,000+ cycle life
  • Variety of mounting brackets, including pipe mounts.
  • Variety of wire lead options available, standard: 18AWG – 12″ or 72″, covered with 1/32″ or 1/16″ thick 100°C plastic insulation. Other custom wire leads, such as gauge, color, length, & connectors available. Contact us for more information.
  • UL Approved
  • Made in USA

For a more economical solution, Senasys has built relationships with overseas suppliers to provide our customers thermostats at a lower cost, with the same high quality as our snap disc thermostats built in the U.S.A.

Mounting Options

With snap discs, different applications will require a different snap disc mounting style. Temperature switches can be installed in a variety of environments, and the right mounting bracket is needed to make sure that the switch is able to perform accurately. Even if a switch functions at the right temperature, the wrong bracket can cause it switch at the wrong time or even not switch at all. See a variety of available mounting options below, or click here to learn more.

If you need a style that isn’t shown here, contact us! We offer custom bracket options as well.

Select from a variety of mounting options below.

2570 Epoxy Sealed Thermostat Dimensions
Standard Cap w/ U-Clip
2570 Options
Flush Mount, Large Flange Bracket
2570F332-123 Drawing
Flush Mount, Notched Bracket
2570 Options
.375″ Diameter Pipe Mount Cap
2570 Epoxy Sealed Thermostat Switches Pipe Mount 625 Product Details
.625″ Diameter Pipe Mount Cap
2570 Options
.500″ Diameter Pipe Mount Cap
2570-099 Thermostat Switch Print
0.75″ Diameter Pipe Mount Cap
2570 Epoxy Sealed Thermostat Switches Pipe Mount 875 Product Details
.875″ Diameter Pipe Mount Cap
2570 Epoxy Sealed Thermostat Switches Pipe Mount 1 Product Details
1″ Diameter Pipe Mount Cap

Standard Temperature Options

Below is a list of our common, off the shelf, bi-metal temperature options. Custom temperature options available. Please contact us.

Disc Number


Close 15°F, Open 5°F (±3°F)


Close by 35ºF max, Open by 25ºF min


Close 45ºF, Open 34ºF (±5°F)


Close 50°F, Open 40°F (±5°F)


Close 65ºF, Open 40ºF (±5°F)


Close 70ºF, Open 60ºF (±5°F)


Close 80ºF, Open 65ºF (±5°F)


Close 90°F, Open 80ºF (±5°F)


Close by 100ºF max, Open by 85ºF min


Close 110ºF, Open 95ºF (±5°F)


Close 120ºF, Open 105ºF (±5°F)


Close 130ºF, Open 115ºF (±5°F)


Close 140ºF, Open 110ºF (±5°F)


Close 150ºF, Open 135ºF (±5°F)


Close 170°F, Open 155 (±5°F)


Close 180ºF, Open 165ºF (±5°F)


Close 200°F, Open 185ºF (±5°F)

Disc Number


Open 15°F, Close 5°F (±5°F)


Open by 30ºF max, Close by 20ºF min


Open by 40ºF max, Close by 30ºF min


Open by 45ºF max, Close by 35ºF min


Open at 50ºF ±5°F, Close at 40ºF ±5°F


Open 60ºF, Close 50ºF (±5°F)


Open 70ºF, Close 60ºF (±5°F)


Open 95°F, Close 85°F (±5°F)


Open 100ºF, Close 85ºF (±5°F)


Open 110°F, Close 100°F (±5°F)


Open 120°F, Close 110°F (±5°F)


Open 130°F, Close 120°F (±5°F)


Open 140ºF, Close 125ºF (±5°F)


Open 150°F, Close 140°F (±5°F)


Open 160°F, Close 150°F (±5°F)


Open 170°F, Close 160°F (±5°F)


Open 180°F, Close 170°F (±5°F)


Open 190°F, Close 180° (±5°F)


Open 200ºF, Close 185ºF (±5°F)


Open 220ºF, Close 205ºF (±5°F)

Common Applications

Our 3/4″ epoxy sealed snap disc thermostats are found in a variety of applications. Choose a category below to learn more.

Thermostat Switches in Food Equipment
Food Equipment

Frequently Asked Questions


What is a bi-metal snap disc?

Our snap disc thermostats are created with bimetal discs in them that react to temperature changes (rise or fall) and ‘snap’ causing the circuit to open or close. We form our discs from one of three bimetal compositions. Click here to learn more.

What custom temperatures are available?

For small quantities, we can build anything from -20°F to 220°F. Contact us for higher temperatures.

What is the DC voltage rating on the 2570 series?

Our epoxy sealed thermostat switches are UL rated for 100,000 cycles 15 Amps at 120VAC / 10 Amps at 240VAC, and 0.5 Amps at 24VDC. We did some additional testing in house. Check out our results  here!

What are the options for the wire leads?

Our standard wire leads are black, 18 AWG at 12″ or 72″ length. We recommend the 72″ length, and then cutting down to what you need. We have other options available including color, lengths and gauge sizes.  Click here  to learn more.

What is the durability of the epoxy sealed thermostats under water?

Senasys manufacturers two different lines of sealed thermal switches,  431 series and 2570 series, which are  UL873 approved to be hermetically sealed. Our sealed snap disc thermal switches are commonly found in environments where condensation, dust or other material may be present.

Senasys performed a series of tests with our sealed thermostat switches by submerging them into fresh water and salt water.  Click here  to see the results!

What is the durability of the epoxy sealed thermostats under water?

Our complete switches aren’t rated for UL94, or any other particular flammability rating for that matter, individual components are. We did some testing in-house as well. Check out the results  here!

How are snap disc thermostats tested?

Senasys tests our snap disc thermostats through air, fluid, hot plate and other testing standards. Learn more about our quality inspection here.

My thermostat isn’t operating. What should I test first?

Continuity! Whether you have a hot or cold temperature thermostat, this test is easy and one of the first things we ask customers. Learn how to do so here.

What is the differential of a snap disc thermostat?

For these types of switches 10ºF is about the smallest range they can maintain cost effectively and consistently.

For complex systems actual testing is usually pretty important. We support this process by making it easy to test multiple package styles and disc temps in sequence or all at once just give us a call. Learn more about temperature differentials here.

What is the temperature tolerance of my snap disc thermostat?

Our standard tolerance is between 5°F to 10°F, but tighter tolerance options are available. We also offer a min/max type. Click here to learn more, or contact us with your requirements.

Where should I locate my thermostat when installing into my equipment?

The location of the temperature switch inside your heating element should be well thought through. Temperature will change in various locations within the system depending on the heating element location. The further you distance from the heating element, the lower the temperature. Where a temperature switch is located will determine how accurate it can measure and control the system. Senasys typically recommends with all of our temperature switches the closer you can get to the heating element the better for the most accurate reading and fastest response time.

What IP rating does my snap disc thermostat have?

The 2570 series has an IP68 rating. To learn more about IP ratings, click here!

Cross Reference

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2570 Series


37T Series

3/4″ Bi-Metal Disc
Automatic Reset
Fixed Temperature
-20°F to 220°F
Single Pole, Single Throw


15 Amps @ 120VAC

100,000 cycles

Variety of Mounting Options – Pipe & Surface
Variety of Wire Options
UL Listed
Made in U.S.A.

Build A Thermostat

Follow the below nomenclature guide to determine the 3/4″ epoxy sealed thermostat to meet your application requirements.

Other custom body, wire options, and more available.   Contact our technical support team to get started!

2570 Epoxy Sealed Snap Disc Thermostat Nomenclature

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