Electrical Controls | McMaster-Carr

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9,032 Products

Electrical

Manual Switches

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

1,239 products

Manual Switch Contact Blocks

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

41 products

Relays

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

722 products

Snap-Acting Switches

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

180 products

Limit Switches

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

149 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

215 products

Sensor Switches

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

652 products

Light Switches

Manually turn lights on and off

58 products

Potentiometers

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

27 products

Timer Relays

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

195 products

Switch Guards

Prevent people from activating switches accidentally

2 products

Motor Starters

Turn motors on and off and protect them from current overloads

422 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

100 products

Light Dimmers

Adjust the brightness of lights, even in large workspaces

12 products

Motor Switches

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

45 products

Magnetic Switches

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

61 products

Safety Switches

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

33 products

Programmable Logic Controllers

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

8 products

Programmable Logic Controller End Plates

Pair with PLCs to tell your processor there are no more inputs or outputs; protect PLCs from debris

1 product

Programmable Logic Controller Communication Modules

Connect and communicate simultaneously with multiple automation devices

12 products

Programmable Logic Controller Input and Output Modules

Connect switches, transmitters, and actuators to your PLC for complex automation jobs

59 products

Programmable Logic Controller Expansion Modules

Increase the number of inputs and outputs for your PLC

12 products

Control Panels

Connect and monitor your fire alarm system

1 product

Speed-Monitoring Switches

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

1 product

Light Switch Sensors

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

75 products

Tilt Switches

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

8 products

Bumper Switches

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

23 products

IO Link Connectors

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

24 products

Transfer Switches

Switch to backup power during an outage

14 products

Switch Mounts

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

5 products

IO Link Programmers

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

1 product

Current Relays

Prevent AC current overload in equipment such as motors and heaters

5 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 products

Motor Speed Controls

Manage the speed of AC and DC motors

36 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

23 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

4 products

Fusible Link Switches

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

5 products

Conductivity Controllers

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

1 product

Motor Controllers

Store and run programs and send signals to a driver to control the motion of a stepper motor

3 products

Light Switch Sensor Guards

Protect light switch sensors from damage and vandalism

5 products

Sensor Switch Transmitters

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

5 products

Electrical Receptacles

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

1,019 products

Electrical Cords

Connect equipment and devices to a power supply

9 products

Power Supplies

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

260 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

413 products

Diodes

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

93 products

Current Conditioners

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

33 products

Varistors

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

20 products

Light Switch/Receptacles

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

2 products

Outlet Boxes

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

6 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

601 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

25 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

4 products

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

5 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

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

2 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

Electric Actuators

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

103 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

3 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

2 products

Lighting

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

33 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

7 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 Reader/Writers

Scan RFID tags and cards to track inventory or grant building access

8 products

Material Handling

Robot Safety Padding

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

6 products

Tablet Holders

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

3 products

Fabricating and Machining

Abrasive Blaster Safety Switches

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

3 products