3/4" Manual Reset Snap Disc Thermostats

SENASYS

3/4″ Manual Reset Snap Disc Thermostats

Senasys manufactures 3/4″ Manual Reset Snap Disc Thermostats, 404 series. Our manual reset thermostat switches are ideal when you want to call special attention to a temperature malfunction. Because the switch needs to be manually reset, a human must interact with the switch and solve the problem before the equipment or appliance can work again.

CUSTOM OPTIONS

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

HIGH QUALITY

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

CERTIFIED

All of our snap disc units are UL approved (USR).

MADE IN U.S.A.

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

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404-440A48 3/4″ Manual Reset Thermostat – Airstream Mount
Rated 3.00 out of 5
$16.75 Select options This product has multiple variants. The options may be chosen on the product page
404-440A28 3/4″ Manual Reset Thermostat – Large Bracket
Rated 5.00 out of 5
$16.75 Select options This product has multiple variants. The options may be chosen on the product page
404-440A38 3/4″ Manual Reset Thermostat – Notched Bracket
Rated 5.00 out of 5
$16.75 Select options This product has multiple variants. The options may be chosen on the product page

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The 404 series is our 3/4″ manual reset snap disc. This series is ideally suited for applications where you want to call special attention to a specific temperature malfunction. The 404 series feature a trip-free operation. Physical depression of the reset button holds the contact open and renders the device inoperative until the reset button is released.

Our 404 manual reset snap disc thermostats have a temperature range of 100-350°F, ±25°F. Many standard temperature options are available, or we can easily design a customer temperature range to suit your application requirement.

Product Specifications

3/4″ Bi-Metal Snap Action Disc
Manual Reset
Breaks on temperature rise
SPST (Single Pole, Single Throw)
25 Amps @ 120VAC, 6,000+ cycles
Temperature Range of 100°-350°F, ±25°F differential
Available with exposed caps to provide a faster response time.
Special black discs can be used to further improve the response to radiative heating in exposed units.
Available with a variety of mounting brackets
Variety of terminal options available.
UL Listed
Made in U.S.A.

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. Additionally, this has allowed us to expand our catalog offering to meet other application requirements, including:

Ratings up to 45A@250VAC
TUV Listed

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Frequently Asked Questions

YOUR QUESTIONS, ANSWERED.

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.

When should an exposed snap disc cap be used?

One of the standout characteristics of an exposed cap is its’ use of a black exposed disc. This disc serves as a crucial element in sensing temperature fluctuations swiftly, enabling the switch to respond rapidly to environmental changes. This quick thermal response is especially important in applications where precise temperature control is paramount, such as in thermostats, industrial control systems, and appliances. The exposed caps are available for all non-epoxied snap disc thermostats within the Senasys catalog.

For more information on exposed snap disc caps, click here.

When should gold contacts be used in place of silver?

One of the key advantages of gold contacts is their significantly lower contact resistance when compared to high-current silver contacts. This low resistance translates into improved electrical conductivity, allowing for smoother and more reliable signal transmission. This is especially important in applications where even the slightest interruption or distortion in the signal could lead to critical errors or malfunctions.

For more information on when gold contacts should be used, click 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.

3/4″ Manual Reset Snap Disc Thermostats

SENASYS