Process Controllers | McMaster-Carr

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System of Measurement

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Horsepower @ Switching Voltage

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Printed Circuit Board

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Surface

Wall

Number of Terminals

For Use With

Hydraulic Fluid (Petroleum Based)

Wire Connection

Pipe Size

Switch Starting Position

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Flat-Pin Mini Thermocouple Connector

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Certification

C-UL Recognized Component

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Mil. Spec.

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UL Recognized Component

Voltage

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

Yes

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Compliant

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Export Control Classification Number (ECCN)

Environment

High-Pressure Washdown

DFARS Specialty Metals

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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2,911 Products

Fluid Handling

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

95 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

139 products

Water Heater Thermostats

Replace the thermostat on your water heater

3 products

Vacuum Switches

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

27 products

Flow Switches

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

177 products

Pressure Switches

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

313 products

Differential Pressure Switches

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

53 products

Pressure and Vacuum Switches

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

6 products

Electrical Power, Networking, and Controlling

PLCs

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

40 products

HMIs

Control PLCs, inverters, and other automated equipment

1 product

IO Link Programmers

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

1 product

Potentiometers

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

26 products

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

Computers

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

18 products

Computer Monitors

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

9 products

Motor Drives

Receive signals from a motor controller and deliver them to your stepper motor

3 products

Tablets

Tough enough to withstand drops, grime, and heavy use

5 products

Timer Relays

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

202 products

Relays

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

366 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

262 products

Motor Switches

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

45 products

Transfer Switches

Switch to backup power during an outage

7 products

Air-Actuated Switches

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

9 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

48 products

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Vehicle Relays

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

36 products

Latching Relays

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

27 products

Monitoring Relays

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

31 products

Infrequent-Cycle Relays

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

128 products

Air-Actuated Relays

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

1 product

Safety Relays

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

60 products

Alternating Relays

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

1 product

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Measuring and Inspecting

Decade Boxes

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

3 products

Power Transmission

Electric Actuators

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

33 products

Stepper Motors

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

27 products

Facility and Grounds Maintenance

Drinking Fountain Replacement Parts

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

2 products

Lighting

LED Drivers

Deliver the electrical current your LEDs need

2 products

Heating, Ventilation, and Air Conditioning

Thermostats

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

72 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