Electronic Switches | McMaster-Carr

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Environment

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High-Temperature Washdown

Mounting Location

Electrical Receptacle

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

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Export Control Classification Number (ECCN)

5A991

EAR99

DFARS Specialty Metals

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Certification

C-TUV Rheinland Certified

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C-UL Recognized Component

TUV Rheinland Certified

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5,933 Products

Electrical Power, Networking, and Controlling

Toggle Switches

Flip the toggle from one position to the other, turning circuits on and off

127 products

Rocker Switches

Press the wide, flat surface to easily turn circuits on and off

121 products

Switch Contact Blocks

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

40 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

247 products

Snap-Acting Switches

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

209 products

Push-Button Switches

Our most common switch type actuates circuits with the push of a button

457 products

Limit Switches

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

153 products

Lever Switches

Grip and twist the lever to turn circuits on and off, preventing accidental actuation

155 products

Joystick Switches

Move the joystick to steer and position cranes, robot arms, and other machinery

15 products

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

263 products

Proximity Sensors

Detect the presence or position of objects from a short sensing distance

428 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

108 products

Ribbon Switches

Place across driveways or walkways to actuate when foot and vehicle traffic pass over

15 products

Emergency Stop Switches

Cut power to equipment during emergencies

190 products

Slide Switches

Like a flashlight, the switch slides from one side to the other to turn circuits on and off

1 product

Key Switches

Turn a key to actuate circuits, preventing accidental start and limiting access

77 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

44 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

31 products

Ethernet Switches

Expand your data network by connecting computers, printers, and servers

68 products

Photoelectric Sensor Reflectors

Pair with reflector photoelectric sensors to bounce light back at them

38 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

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

45 products

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

5 products

Switch Padding

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

4 products

Rotary Switches

Control multiple devices with a single switch

13 products

Transfer Switches

Switch to backup power during an outage

7 products

Touch-Pad Switches

Lay flat or mount on a wall to alert you when doors open or objects are removed

4 products

Switch Mats

Step on a mat to actuate circuits, often to control doors, lights, and alarms

45 products

Enabling Switches

Equipment only runs while you press the switch; also known as deadman switches

18 products

Foot Switches

Step on the pedal to actuate circuits while keeping your hands free for other tasks

94 products

Pendant Switches

Control machinery, such as cranes, hoists, and trolleys, from a safe distance

93 products

Pull Switches

Tug on a cable or rope to turn on and off circuits, often for production lines along conveyors

4 products

Doorbell Switches

Activate doorbells or buzzers with the push of a button

22 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

36 products

DIP Switches

Slide actuators to open or close each circuit to configure instructions for electronic devices

7 products

Battery Switches

Turn the knob to alternate between two batteries without interrupting power

1 product

Air-Actuated Switches

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

13 products

Fingerprint Scanners

Use fingerprints to confirm the identity of personnel before granting access to areas or equipment

3 products

Enclosure Door Switches

Control fans, lights, and other devices inside your enclosure when you open and close the door

2 products

Pull-Chain Switches

Pull a chain to send a signal, such as for turning on and off lights and fans

1 product

Automatic Door Switches

Doors open when you touch a button or the switches detect motion

18 products

Cylinder Position Sensors

Monitor your air cylinder rod's position and turn the cylinder on and off

8 products

Ultrasonic Sensors

Measure the distance to objects and the level of liquids and materials

21 products

Relays

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

414 products

Latching Relays

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

29 products

Timer Relays

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

202 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

79 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

47 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

147 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

64 products

Alternating Relays

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

2 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

PLCs

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

76 products

VFDs

Control the speed and torque of AC electric motors

23 products

Potentiometers

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

26 products

Control Panels

Connect and monitor your fire alarm system

1 product

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

Motor Starter Overload Protectors

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

8 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

Linear Position Sensors

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

16 products

IO-Link Programmers

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

1 product

DC Motor Drives

Control the speed and torque of DC electric motors

7 products

Outlet Boxes

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

8 products

Fusible Link Switches

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

10 products

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

34 products

I/O Modules

Communicate between your sensors and actuators and your PLC

18 products

Power Cords

Connect equipment and devices to a power source

2 products

Power Receptacles

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

70 products

Lighting

Light Switches

Manually turn lights on and off

65 products

Light Switch Sensors

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

74 products

Light Dimmers

Adjust the brightness of lights, even in large workspaces

18 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

2 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 Switch/Receptacles

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

3 products

Measuring and Inspecting

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

1 product

Thermometer Cooling Jackets

Connect to a compressed air or water line to keep infrared thermometer transmitters from overheating

1 product

Thermometer Insulating Tubes

Prevent infrared thermometer transmitters from overheating by shielding them from hot surfaces

1 product

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

1 product

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

Fabricating and Machining

Abrasive Blaster Safety Switches

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

9 products

Fluid Handling

Temperature Switches

Turn heating equipment on or off at a specified temperature

5 products

Directional Control Valves

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

218 products

Vacuum Switches

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

4 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

8 products

Flow Switches

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

8 products

Noncontact Temperature Sensor Transmitters

Send temperature readings of molten steel, furnaces, and other extremely hot surfaces to your PLC

10 products

Solenoid On/Off Valves

A solenoid withstands rapid cycling for applications with frequent opening and closing

2 products

Material Handling

Conveyor Accessory Mounts

Position guides or sensors to the exact spot needed for your conveyor

30 products

Facility and Grounds Maintenance

Mirrors

View your reflection or deflect beams from safety barrier switches for a perimeter around machinery

10 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

Building and Machinery Hardware

Brackets

Connect surfaces in an assembly

60 products

Indicating Knobs

Control devices and view settings at a glance

62 products

T-Slotted Framing Switches

Attach to your rail to actuate components or cut power

10 products

Safety Equipment

Fire Alarm Pull Stations

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

5 products

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

6 products

Communication

Audible Alarms/Indicator Lights

Alert people with both light and sound

2 products

Legend Plates

Mark switches and lights on control panels for easy identification

15 products

Speaker Volume Controls

Wire between your speakers and sound amplifier to adjust the volume

4 products

RFID Readers

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

8 products

Audible Door Alarms

An alarm sounds if someone opens a door without using the code or key

7 products