3/4" Adjustable Snap Disc Thermostats

SENASYS

3/4″ Adjustable Snap Disc Thermostats

KST Series

Senasys 3/4″ Adjustable Snap Disc Thermostats (KST Series) are great for unique applications that require a flexible switching temperature.

Our quality-engineered adjustable snap discs are designed for a variety of applications, including heating systems and appliances.

These robust adjustable snap discs can be used in high current applications, carrying up to 25 amps at 240VAC for 100,000 cycles. These switches are available as a single-pole, single-throw (SPST) device.

Senasys adjustable snap discs have adjustable options from 90°F to 290°F, making them a versatile and flexible component of any electric heating system.

custom options

We offer custom terminals and mounting options to meet the needs of original equipment manufacturers.

high quality

These parts are built using welded construction for integrity of current-carrying components. All units are subject to 100% mechanical and thermal inspection

certified

We take pride in the reliable operation of our components. Our KST adjustable snap discs are UL and cUL listed.

made in u.s.a.

Products are designed, stocked & shipped from our facilities in Eau Claire, WI to clients across the globe.

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Senasys Adjustable Snap Disc Thermostats are quaility engineered thermal sensors specifically for a variety applications including heating systems and appliances. Senasys KST series feature adjustable fan or limit operation through our bi-metal disc design, giving users the ability to adjust the operating temperature within an approximate temperature range.

To ensure that a safe combination of thermostat and application is achieved, the purchaser must determine product suitability for their individual requirements.

Features

Units available for limit and control applications.
Accurate air and surface temperature regulation.
Adjustable dial knob gives end user control over opening/close temperature.
The snap-action of the bi-metal disc provides high-speed contact separation resulting in excellent life cycle characteristics at electrical loads up to 25 amps at 277 VAC for 100,000 cycles.
Welded construction for integrity of current-carrying components.
Contact chattering is virtually eliminated, as is false cycling and sparking.
The bimetallic disc is thermally and electrically insulated from the power circuit, eliminating self- heating effects.
Only the temperature of the controlled equipment causes the switch to actuate.
Switch operation is rapid and positive due to the characteristics of the bimetallic disc.
Enclosed or Exposed discs available. Exposed discs allow the switch to react faster to temperature change, an exposed bimetal disc or an optional matte finish disc may be specified. The enclosed disc construction provides greater protection than the exposed disc construction, keeping airborne contaminants such as dirt and dust from entering the control. It also protects the bimetal disc from possible physical damage during assembly and in the final application.
For added flexibility, the orientation of the terminals with respect to the mounting bracket can be specified in 45 angular degree increments.
Terminals 90° to mounting holes (standard)
Terminals 45° clockwise to mounting holes
Terminals 45° counterclockwise to mounting holes
Variety of custom capabilities, such as terminal options, brackets, pipe and tube mounts, over-molding and epoxy sealing, and temperature specifications, to meet needs of original equipment manufacturers.

Product Specifications

Single-pole, single-throw (SPST) models available.
Manufactured to individual temperature ranges between 90°F and 290°F (32°C to 140°C) available
Manufactured to meet individual temperature differentials between 20°F to 40° (0°C to 4°C).
Designed to meet tight tolerances of ±3°F to ±10°F
Temperature calibrations are preset, and all units are subject to 100% mechanical and thermal inspection.
Great for unique applications which require a faster response time or a lower contact resistance.
Gold contacts available for low electrical loads
Opens or Closes on Temperature Rise
Available in a variety of terminal and mounting configurations, and other custom options to meet needs of original equipment manufacturers.
Recognized by UL/cUL

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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 do you adjust the temperature?

There is a dial that you can turn with a flat head screwdriver.

How much power does a snap disc use?

A snap disc does not use any power. Instead it acts as a circuit breaker for a system.

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.

Can the differential be adjusted?

No, the differential is fixed on all units.

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.

Do we offer custom units?

We can offer limited customization with the terminals, but the vast majority of applications will be able to use a standard option.

3/4″ Adjustable Snap Disc Thermostats

SENASYS