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. It is UL listed for use in Class I, Divisions 1 and 2, Groups B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 hazardous locations. The housing also meets NEMA 4X for use in washdown environments with splashing water, corrosive liquid, and dust. Install the threaded probe directly into tanks, pipelines, and other process components to turn heating equipment on or off at a specified temperature. Set actuation points with the adjustment dial.

Switch with one actuation point has one single pole, double throw (SPDT) relay. The relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Switch with two actuation points has two single pole, double throw (SPDT) relays. Each relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Turn heating equipment on or off at a specified temperature. Switches have a probe on a cable for remote temperature readings. Set the actuation point with the adjustment dial.

Switches that control one circuit are single pole, double throw (SPDT). They can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Switches that control two circuits are double pole, single throw (DPST). They turn two circuits from on to off (normally closed).

Switches with an open housing are often added to existing enclosures or custom installations.

Switches with a pilot light indicate when the switch is on.

Use packing seals and fittings (sold separately) to seal the probe into threaded tanks and pipes.

To protect these switches from splashing water, corrosive liquid, and dust, the housing meets NEMA 4X for washdown conditions. Switches turn heating equipment on or off at a specified temperature. All have a probe on a cable for remote temperature readings. Set actuation points with the adjustment dial.

Single pole, double throw (SPDT) switches can be set to turn circuits from off to on (normally open) or from on to off (normally closed). Switches with one actuation point have one single pole, double throw (SPDT) relay. The relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed). The probe has 1/2 NPT male threads for installation directly into tanks, pipelines, and other process components. It comes with a bushing that adapts the thread size to 3/4 NPT male. Switches with two actuation points have two single pole, double throw (SPDT) relays. Each relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Double pole, single throw (DPST) switch turns two circuits from on to off (normally closed).

Triple pole, single throw (3PST) switches turn three circuits from on to off (normally closed).

Turn heating equipment on or off in environments with flammable gases, combustible dust, and ignitable fibers, such as chemical plants, refineries, and grain elevators. The switch housing is UL listed for use in Class I, Divisions 1 and 2, Groups B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 hazardous locations. It also meets NEMA 4X for use in washdown environments with splashing water, corrosive liquid, and dust. Switches have a probe on a cable for remote temperature readings. Set actuation points with the adjustment dial.

Switch with one actuation point has one single pole, double throw (SPDT) relay. The relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed). The probe has 1/2 NPT male threads for installation directly into tanks, pipelines, and other process components. It comes with a bushing that adapts the thread size to 3/4 NPT male.

Switch with two actuation points has two single pole, double throw (SPDT) relays. Each relay can be set to turn one circuit from off to on (normally open) or from on to off (normally closed).

Install the probe directly into drilled and reamed holes to turn heating equipment on or off at a specified temperature. Use the adjustment screw to set the actuation point. All switches are single pole, single throw (SPST) and control one circuit.

Normally open switches turn the circuit from off to on.

Normally closed switches turn the circuit from on to off.

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. They read temperature with a highly sensitive thermocouple or RTD probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. All fit DIN cutouts for installation into instrument panels. Use the keypad to set the actuation point. Controllers are auto/manual selectable and have two alarm relays.

Mechanical relays actuate circuits directly. All are single pole, single throw (SPST) and turn circuits from off to on (normally open). Controller with one mechanical relay actuates one circuit. Controller with two mechanical relays actuates two circuits.

Signal relays output 4-20 mA current to actuate equipment on a current loop.

The faceplate is sealed to meet NEMA 4X and IP66 for protection in washdown environments with splashing water, corrosive liquid, and dust. The rear case meets IP20. These controllers have proportional-integral-derivative (PID) software with fuzzy logic that learns system behavior and automatically compensates for changes to achieve high accuracy in applications with fluctuating conditions. They read temperature with a highly sensitive thermocouple probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. All fit into instrument panels with DIN cutouts. Set actuation points with the keypad. Controllers are auto/manual selectable.

Controllers with 1/16 DIN trade size have one alarm relay.

Controllers with 1/8 and 1/4 DIN trade size have two alarm relays.

Mechanical relays actuate one circuit directly. Single pole, double throw (SPDT) relays can be set to turn the circuit from off to on (normally open) or from on to off (normally closed). Single pole, single throw (SPST) relay turns the circuit from off to on (normally open).

Solid-state relays actuate an external relay (not included). They have a longer service life than mechanical or signal relays.

Signal relays output 4-20 mA current to actuate equipment on a current loop.

Install these controllers into instrument panels. They read temperature with a highly sensitive thermocouple or RTD probe (sold separately) in critical process applications to turn heating equipment on or off at a specified temperature. Set the actuation point with the keypad. Controllers are single pole, double throw (SPDT). They can be set to turn one circuit from off to on (normally open) or on to off (normally closed).

For protection in washdown conditions with splashing water, corrosive liquid, and dust, these controllers have a housing that meets NEMA 4X. They include a highly sensitive Type J thermocouple to take temperature readings in critical process applications and turn heating equipment on at a specified temperature. Use the keypad to set the actuation point. Controllers are triple pole, single throw (3PST). All have a control relay that turns three circuits from off to on (normally open). They also have two alarm relays.

These lightweight controllers have a carrying handle. They read temperature with a highly sensitive Type J thermocouple probe (sold separately) to turn heating equipment on or off at a specified temperature in critical process applications. Use the keypad to set the actuation point. All controllers are single pole, single throw (SPST). They have a control relay that turns one circuit from off to on (normally open). All come with a flat-pin connector for attaching a thermocouple.

These controllers turn on and off in short cycles to continuously maintain a stable set temperature. They require a separate thermometer to calibrate and monitor temperature. Adjust the ratio of on to off time with the dial.

Mechanical relay actuates one circuit directly. It is single pole, single throw (SPST) and turns the circuit from on to off (normally closed).

Solid-state relay actuates an external relay (not included). It has a longer service life than a mechanical relay.

Control a single heating or cooling device in your enclosure to keep electronics at a safe operating temperature. Clip them on to a DIN rail and connect them to your heater, fan, or air conditioner.

All these thermostats meet American, Canadian, or European safety standards. They have an IP20 rating—to prevent shocks, fingers won’t fit inside. They also meet UL 94 V-0, so they self-extinguish within 10 seconds if they catch fire and won’t spread the fire by dripping.

Adjustable thermostats let you set the temperature you need.

These thermostats keep the air in your enclosure within a set range. Temperature setting is the high end of the range for both heating and cooling thermostats. Heating thermostats are normally closed—when the air in your enclosure reaches the temperature setting, the thermostat will turn the heater off. Cooling thermostats are normally open, so they’ll switch your fan or air conditioner on when the air in your enclosure reaches the temperature setting.

Temperature difference is the difference between the temperature when the thermostat turns your device on and when it turns off. For a heater thermostat with a temperature setting of 50° and an 18° temperature difference, the thermostat will switch your heater on when the temperature goes below 32° and off once the temperature reaches 50°. Thermostats with a lower temperature difference maintain a narrower range of temperatures, but they use more power because they switch on and off more frequently.

Keep electronics in your enclosure from getting too hot or cold with these thermostats that control two devices at once. Clip them to a DIN rail to install.

Adjustable thermostats allow you to set custom temperatures.

Heating and cooling thermostats control heaters and fans or air conditioners. Thermostats with one actuation point, also known as changeover thermostats, switch between heating and cooling so one device is always running. When the temperature in your enclosure gets hotter than the temperature you set, the thermostat will turn on your fan or air conditioner. It goes back to heating once the temperature is reduced by the temperature difference. So for a thermostat with a temperature difference of 9° F, setting it at 60° F means it will heat the enclosure until it reaches 60° F, switch to cooling until it reaches 51° F, and then switch back to heating.

Heating and cooling thermostats with two actuation points control two devices independently. When your enclosure temperature is within the set range, neither device is powered, so they’re more efficient than changeover thermostats. For each device, temperature setting is the high end of the temperature range, and temperature difference is the size of the range. For a thermostat with temperature settings of 59° and 95° F and an 18° F temperature difference, the heater will switch on when your enclosure is colder than 41° F and turn off when it reaches 59° F. The fan or other cooling device will switch on when the temperature goes above 95° F and turn off once the enclosure cools to 77° F.

Cooling thermostats regulate two cooling devices, such as a fan and an air conditioner, for two-stage cooling. Use only one device for cooling in mild temperatures or both for extreme heat. These thermostats switch your equipment on when the enclosure is hotter than the temperature setting. Once the temperature is reduced by the temperature difference, it will switch off. For example, a thermostat set at 77° F for a fan and 140° F for an air conditioner will power both devices when the enclosure is over 140° F. With a temperature difference of 18° F, the air conditioner will switch off when the temperature goes below 122° F. The fan will run until the temperature reaches 59° F, and switch back on if it heats up to 77° F or hotter.

All thermostats meet IP20, which means they’re designed so fingers can’t fit inside and get shocked. They also meet UL 94 V-0, so they self-extinguish within 10 seconds if they catch on fire and won’t spread the fire by dripping. Thermostats that are CE marked or VDE certified meet European safety standards. UL Recognized Component and C-UL Recognized Component thermostats also meet American and Canadian safety standards.