Thermostats | McMaster-Carr

	Voltage Voltage

	For Use With For Use With

Heaters

Air Conditioners

Fans

	Temperature Setting Temperature Setting

	Thermostat Type Thermostat Type

Nonprogrammable

Programmable

Wi-Fi Enabled Programmable

	Electrical Connection Type Electrical Connection Type

Hardwire

Plug

	Sensor Type Sensor Type

Built In

Remote

	Current Current

	Switch Type Switch Type

	Control Type Control Type

	For System Type For System Type

	Display Type Display Type

Analog

Digital

	For Use Outdoors For Use Outdoors

Yes

	For System Efficiency For System Efficiency

Single Stage

Multistage

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Overall Height Overall Height

	Overall Width Overall Width

	Overall Depth Overall Depth

	Specifications Met Specifications Met

	Program Function Program Function

Daily

Weekdays/Saturday/Sunday

	Environmental Rating Environmental Rating

IEC Zone 1 Groups IIC,
IIB, IIA

IEC Zone 21 Groups
IIIC, IIIB, IIIA

NEC Class I Division 2
Groups A, B, C, D

NEC Class I Divisions
1, 2 Group D

NEC Class I Divisions
1, 2 Groups B, C, D

NEC Class I Divisions
1, 2 Groups C, D

NEC Class II Divisions
1, 2 Groups E, F, G

NEC Class III
Divisions 1, 2

NEC Zone 1 Groups
IIB, IIA

	Material Material

Plastic

Aluminum

Steel

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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196 Products

Thermostats and Guards

Line-Voltage Thermostats

Regulate line-voltage HVAC systems.

Plug-In Line-Voltage Thermostats

Plug in the thermostat, then plug your heater into the socket on the thermostat's plug.

Line-Voltage Thermostats with Thermowell

Commonly used with hydronic heaters, this thermostat senses the temperature of liquids. The thermowell protects the sensor.

Multi-Speed Line-Voltage Thermostats

Control one- and two-speed heaters and air conditioners.

Remote-Sensor Line-Voltage Thermostats

Place sensor in enclosures or different rooms than the rest of the thermostat to control temperature from outside the space. Thermostats work with line-voltage HVAC systems.

Remote-Sensor Line-Voltage
Thermostats with Thermowell

Commonly used with hydronic heaters, this thermostat senses the temperature of liquids. The thermowell protects the sensor.

DIN-Rail Mount Remote-Sensor
Line-Voltage Thermostats

Remote-Sensor Hazardous
Location Line-Voltage Thermostats

Place sensor in enclosures or different rooms than the rest of the thermostat to control temperature from outside the space.

Hazardous Location Line-Voltage Thermostats

Use to regulate line-voltage HVAC systems where flammable gases, vapors, and dust are present. Thermostats are rated Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G.

Washdown Line-Voltage Thermostats

These thermostats are rated NEMA 4X for protection from dirt, washdowns, and corrosion.

Programmable Low-Voltage Thermostats

Set these thermostats to adjust the temperature at certain times each day.

Low-Voltage Thermostats

These thermostats work with low-voltage HVAC systems that have only one speed.

Wi-Fi Enabled Programmable Low-Voltage Thermostats

Connect to a Wi-Fi network so you can remotely program, monitor, and control the temperature from a computer, tablet, or smart phone.

Remote Room-Monitoring Adjustable Thermostats

If ambient air temperature rises above or falls below an actuation point, this thermostat flashes the current temperature reading on the display and shows a “high” or “low” message.

Enclosure Thermostats

Control a single heating or cooling device in your enclosure to keep electronics at a safe operating temperature.

Enclosure Thermostats for Multiple Devices

Keep electronics in your enclosure from getting too hot or cold with these thermostats that control two devices at once.

Snap-Action Thermostats

Also known as snap discs, these thermostats switch on cooling systems or switch off heating systems when equipment gets too hot.

Thermostat Guards

Restrict access and protect thermostats from damage.

Reverse-Action Air-Powered Thermostats

As the temperature goes up, the pressure in the system goes down.

HVAC Damper Actuators

Proportional HVAC Damper Actuators

These actuators provide better control than incremental actuators because they are constantly being positioned in response to duct airflow requirements.

Incremental and Proportional HVAC Damper Actuators

Actuators automatically switch between incremental and proportional control to adjust dampers to regulate airflow.

Incremental HVAC Damper Actuators

When duct airflow varies from the setpoint, these actuators open and close until the system requirement is restored.

Temperature Switches

Wall-Mount Temperature Switches

These temperature switches mount on walls and take remote temperature readings with a probe on a cable.

Washdown Wall-Mount Temperature Switches

To protect these switches from splashing water, corrosive liquid, and dust, the housing meets NEMA 4X for washdown conditions.

Hazardous Location Wall-Mount Temperature Switches

Housing is UL listed for environments with flammable gases, combustible dust, and ignitable fibers, such as chemical plants, refineries, and grain elevators.

Compact Threaded Temperature Switches

Since these switches don’t have a housing above the probe, they are often used in tight spaces and low-clearance areas.

Threaded Temperature Switches

Install the threaded probe directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature.

Easy-Adjust Threaded Temperature Switches

Switch heating equipment on and off at a specified temperature by installing these electronic switches directly into tanks, pipelines, and other process components. Simply twist the outer rings to adjust your set point—no need for tools.

Washdown Threaded Temperature Switches

To control heating equipment in washdown environments with splashing water, corrosive liquid, and dust, these switches have a housing that meets NEMA 4X.

Hazardous Location Threaded Temperature Switches

Often used in hazardous locations, such as chemical plants, refineries, and grain elevators, these switches have a housing that’s UL listed for environments with flammable gases, combustible dust, and ignitable fibers.

Surface-Mount Temperature Switches

Often used to control heat cable output, these switches have mounting holes for surface installation.

Insertion Temperature Switches

Install directly into drilled and reamed holes.

Precision Temperature Controllers

Autocorrecting Precision Panel-Mount
Temperature Controllers

For high accuracy in applications with fluctuating conditions, these controllers have proportional-integral-derivative (PID) software with fuzzy logic that learns system behavior and automatically compensates for changes.

Autocorrecting Washdown Precision
Panel-Mount Temperature Controllers

The faceplate is sealed to meet NEMA 4X for protection in washdown environments with splashing water, corrosive liquid, and dust.

Precision Panel-Mount Temperature Controllers

Install these controllers into instrument panels.

High-Limit Precision Panel-Mount
Temperature Controllers

To protect equipment and personnel, these controllers shut down your machine when it gets too hot and won’t let it turn back on until they’re reset. Mount them to DIN panel cutouts in your heating equipment.

Precision Washdown Wall-Mount
Temperature Controllers

For protection in washdown conditions with splashing water, corrosive liquid, and dust, these controllers have a housing that meets NEMA 4X.

Precision Portable Temperature Controllers

These lightweight controllers have a carrying handle.

Panel-Mount Temperature Controllers

Install these controllers in DIN panel cutouts to maintain your heating equipment’s temperature. When your machine gets too hot, they turn it on and off in short cycles to cool it down.

Thermostats for Electric Water Heaters

Drinking Fountain Replacement Parts