Process Controllers | McMaster-Carr

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System of Measurement

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Horsepower @ Switching Voltage

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Surface

Wall

Number of Terminals

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Hydraulic Fluid (Petroleum Based)

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Flat-Pin Mini Thermocouple Connector

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C-UL Recognized Component

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Voltage

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Environment

High-Pressure Washdown

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Export Control Classification Number (ECCN)

REACH

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Pressure Set Point

0 in. H₂O to 0.5 in. H₂O

0 in. H₂O to 1 in. H₂O

0 in. H₂O to 2 in. H₂O

0 in. H₂O to 5 in. H₂O

0 in. H₂O to 10 in. H₂O

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2,984 Products

Temperature Controllers

Autotuning Temperature Controllers

Autotuning makes fine adjustments for the most precise and stable temperature control

50 products

Washdown Autotuning Temperature Controllers

NEMA and IP rated for protection in washdown environments

14 products

Washdown Wall-Mount Autotuning Temperature Controllers

The housing is NEMA rated for protection in washdown conditions

5 products

On/Off Temperature Controllers

The simplest temperature controllers—turn devices fully on or off

7 products

Bench-Top Autotuning Temperature Controllers

The enclosure protects them when they're sitting on your workbench

8 products

High-Limit Temperature Controllers

Shut down your machine when it gets too hot to protect equipment and personnel

6 products

Adjustable-Power Temperature Controllers for Plug-In Heaters

Regulate the amount of power flowing to your heater with the turn of a dial

1 product

DIN-Rail-Mount Autotuning Temperature Controllers

Mount directly onto DIN rail

4 products

Proportional Temperature Controllers

Cycle heaters on and off intermittently to maintain a set temperature in your system

7 products

Washdown On/Off Temperature Controllers

NEMA and IP rated to turn your equipment on or off in areas with frequent washdowns

3 products

On/Off Temperature Controllers for Plug-in Heaters

Switch heaters on or off when your process reaches a certain temperature

2 products

Other Products

PLCs

Program complex automation jobs by combining the functionality of a relay, timer relay, and switch

76 products

IO-Link Programmers

Configure your IO-Link devices without a PC, outlet, or separate software

1 product

Timer Relays

Turn machinery on or off after receiving an electrical signal that starts the timer

202 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

138 products

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

Flow Switches

Turn equipment on or off when flow rate reaches a set point

177 products

Potentiometers

Control speed, volume, and light intensity by varying electrical flow; also known as rheostats

26 products

Vacuum Switches

Activate controls, set off alarms, and power equipment when a set vacuum is reached

26 products

Pressure and Vacuum Switches

Activate controls, set off alarms, and power equipment when a set pressure or vacuum is reached

7 products

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

3 products

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

414 products

Pressure Switches

Activate controls, set off alarms, and power equipment when a set pressure is reached

310 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

260 products

Infrequent-Cycle Relays

Use with equipment that cycles on and off, such as HVAC systems

147 products

Thermostats

Connect to heaters, fans, and air conditioners to control the temperature

72 products

Safety Relays

Monitor circuits and force machines to a safe stop if the relay detects a fault

64 products

Differential Pressure Switches

Activate controls and alarms when the pressure difference between process lines exceeds a setpoint

53 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

79 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

45 products

Vehicle Relays

Switch high-current loads on vehicles, such as starters, headlights, and fuel pumps

47 products

Latching Relays

Lock into position so they don't require constant voltage to stay switched

29 products

Stepper Motors

The motor shaft turns in small, equal increments for precise positioning

27 products

Monitoring Relays

Trip circuits or sound an alarm when voltage, current, or other limits are exceeded

31 products

HMIs

Control PLCs, inverters, and other automated equipment

24 products

Electric Actuators

Push and pull loads with more precise positioning than air and hydraulic cylinders

33 products

Linear Position Sensors

Measure the position of an object moving in a straight line; also known as string pots

16 products

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Computers

Sturdy and reliable for harsh industrial jobsites, from frigid freezers to sweltering foundries

18 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Air-Actuated Switches

Press with your hand or foot to turn circuits on and off with air pressure

13 products

Computer Monitors

Display information in tough conditions such as on factory floors and outdoor jobsites

9 products

Stepper Motor Drives

Control the speed and position of stepper motors

6 products

Transfer Switches

Switch to backup power during an outage

7 products

Tablets

Tough enough to withstand drops, grime, and heavy use

12 products

HVAC Switches

Control and monitor airflow in HVAC systems automatically

3 products

Temperature-Controlled Outlet Adapters

Automatically turn heating and cooling devices on and off as temperatures rise and fall

3 products

Water Heater Thermostats

Replace the thermostat on your water heater

3 products

Drinking Fountain Replacement Parts

Replace nozzles, regulators, filters, handles, and other original manufacturer parts

2 products

LED Drivers

Deliver the electrical current your LEDs need

2 products

Air-Actuated Relays

Convert an air signal on a pneumatic control system to an electric one

1 product

Alternating Relays

Automatically split run time between two devices so one isn't always running

2 products