Electrical Controls | McMaster-Carr

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9,734 Products

Most Likely Products

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

1,265 products

Relays

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

713 products

All Results

Electrical Power, Networking, and Controlling

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

1,265 products

Snap-Acting Switches

Open and close circuits quickly to minimize arcing and sticking; often used as door-open indicators

206 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

209 products

Limit Switches

Turn equipment on or off when objects touch the actuator; often used for conveyors and bin filling

153 products

Manual Switch Contact Blocks

Mount to switches to control electrical circuits as you move the switch

40 products

Sensor Switches

Detect moving objects from a distance, triggering a circuit to open or close

681 products

Magnetic Switches

Actuate when a magnet comes within sensing distance; often used to detect when doors or windows open

120 products

Motor Switches

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

46 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

108 products

Switch Guards

Prevent people from activating switches accidentally

2 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

59 products

Speed-Monitoring Switches

Avoid downtime and machinery damage by detecting slowdowns in drive trains and conveyors

3 products

Tilt Switches

Trip circuits when tilted; use as position indicators, pump level controls, and limit switches

8 products

Switch Mounts

Mount sensor switches to panel cutouts, tank walls, or conveyors

5 products

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

38 products

Bumper Switches

Signal when overhead doors close or items reach the end of conveyors

31 products

Transfer Switches

Switch to backup power during an outage

7 products

Switch Safety Barriers

Safely send power to switches and sensors in volatile areas such as refineries and power plants

2 products

Switch Padding

Trigger an emergency stop when robot arms contact a worker or object

4 products

Sensor Switch Transmitters

Monitor objects, switch equipment on and off, and send data to control systems with a single device

21 products

Relays

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

713 products

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

IO Link Programmers

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

1 product

PLCs

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

19 products

Control Panels

Connect and monitor your fire alarm system

1 product

HMIs

Control PLCs, inverters, and other automated equipment

1 product

Motor Speed Controls

Manage the speed of AC and DC motors

37 products

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

4 products

Motor Starter Overload Protectors

Upgrade your motor starter protector to use less energy and emit less heat

8 products

Conductivity Controllers

Turn pumps, mixers, and valves on and off based on a solution’s conductivity

3 products

Motor Drives

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

3 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

Motor Controller/Drives

Determine settings such as steps, direction, and step resolution from one device

3 products

Tablet Holders

Equip tablets with safety switches to halt robots, conveyors, and other machinery in an instant

3 products

Relay Sockets

Quickly mount relays to DIN rail or flat surfaces

26 products

Timer Relays

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

197 products

Diodes

Route current in one direction and block it in the other to protect sensitive electronics

93 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 products

Varistors

Protect sensors, programmable logic controllers, and other small components from electrical surges

20 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

44 products

Power Receptacles

Install in a wall or panel to transmit power to plugs or sockets

707 products

USB Receptacles

Install in an outlet box to charge multiple devices

1 product

Mil. Spec. Receptacles

Install in walls and panels and pair with Mil. Spec. plugs

60 products

IO Link Connectors

Remotely view measurements, adjust settings, and identify errors in sensors and actuators

28 products

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

289 products

CB Radio Connectors

Sockets and receptacles to connect CB radios

2 products

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

73 products

D-Sub Connectors

Plugs, sockets, receptacles, and adapters for connecting computers, monitors, and printers

138 products

Ecomate Connectors

Connect machine tools, robots, and other vibrating equipment

14 products

Audio Connectors

Plugs, sockets, receptacles, and adapters to make audio connections

26 products

Mini Receptacles

Install in walls and panels and pair with plugs to send power and signal

48 products

Solenoid Valve Connectors

Sockets and receptacles to connect solenoid components, such as valves and motors

20 products

Power Cords

Connect equipment and devices to a power source

9 products

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

252 products

Current Conditioners

Lower current flows to levels that work with panel monitors and other electrical measuring equipment

33 products

Current Relays

Prevent AC current overload in equipment such as motors and heaters

5 products

Rectifiers

Convert AC voltage to a constant DC voltage on a circuit board

30 products

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

439 products

Fusible Link Switches

Use as a safety switch to shut off hydraulic equipment and other machinery when the link melts

10 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

8 products

Lighting

Light Switches

Manually turn lights on and off

58 products

Light Dimmers

Adjust the brightness of lights, even in large workspaces

18 products

Light Switch/Receptacles

Combine a switch and receptacle into a single outlet box for a small footprint

2 products

Light Switch Sensors

Automatically turn lights on and off when you enter and exit rooms

74 products

Light Switch Sensor Controllers

Turn lights on and off or dim them in unison from a secure Bluetooth network

9 products

Light Switch Sensor Guards

Protect light switch sensors from damage and vandalism

5 products

Light Socket Pull Cords

Lengthen pull-chain light switches

1 product

Light Sockets

Install or replace sockets in fixtures for standard household, tubular, compact, or miniature bulbs

51 products

LED Drivers

Deliver the electrical current your LEDs need

50 products

Light Retrofit Kits

Upgrade to energy-efficient LED lights without completely replacing old fixtures

11 products

Fluid Handling

Directional Control Valves

Manage the flow of fluids to move equipment in air- and hydraulic-powered systems

197 products

On-Off Valves

Start and stop flow through a line

600 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

29 products

Air Pulse Valves

Convert continuous flow into bursts that reduce air consumption in dryers and dust collectors

5 products

Flow Switches

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

8 products

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

8 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

5 products

Power Transmission

Stepper Motors

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

197 products

Servomotors

Create rotary motion with accurate positioning and fine control over speed and torque

96 products

Stepper Gearmotors

Stepper motor and gearbox in one for high torque in areas large motors won’t fit

20 products

Electric Gearmotors

A motor and speed reducer in one to slow speed and increase torque in AC- or DC- power applications

52 products

Electric Motors

Keep machinery and equipment moving with AC or DC power

34 products

Electric Actuators

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

103 products

Brakes

Control how much and how quickly your drive system slows down

7 products

Clutches

Start and stop the transmission of power to machinery

58 products

Torque Limiters

Keep torque at or below a set limit to control tension or braking or protect machinery from overload

112 products

Clutch/Brakes

Control when to transmit power with a clutch and when to hold a load in place with a brake

5 products

Positioning Slides

A lead screw drives the carriage for accurate positioning in laboratory and production equipment

50 products

Building and Machinery Hardware

Indicating Knobs

Control devices and view settings at a glance

89 products

Brackets

Connect surfaces in an assembly

64 products

Garage Door Openers

Automatically open and close overhead doors; also known as jackshafts

4 products

Door Openers

Automatically open doors with a slight nudge

2 products

Measuring and Inspecting

Signal Output Testers

Check if the signal output of a DC switch is NPN or PNP to know how to wire components

1 product

Decade Boxes

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

3 products

Safety Equipment

Smoke Detector Test Stations

Test hard-to-reach HVAC smoke detectors from a convenient location

1 product

Smoke Detectors

Warn people when there's smoke in your facility

17 products

Fire Alarm Pull Stations

Activate to send a signal to your control panel if there's a fire

3 products

Heating, Ventilation, and Air Conditioning

HVAC Flame Detectors

Replace flame detectors in HVAC equipment such as furnaces, ovens, water heaters, and boilers

1 product

Communication

Speaker Volume Controls

Wire between your speakers and sound amplifier to adjust the volume

4 products

Audible Alarms

Everything from bells and whistles to horns and sirens

5 products

RFID Readers

Read RFID cards when prototyping systems or scan RFID tags to control circuits

3 products

RFID Reader/Writers

Scan RFID tags to sort inventory, track items, and control building access

10 products

Fabricating and Machining

Abrasive Blaster Safety Switches

Shut off abrasive blasters if the operator loses control; also known as deadman switches

6 products