Switches | McMaster-Carr

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8,321 Products

Electrical Power, Networking, and Controlling

Toggle Switches

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

127 products

Push-Button Switches

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

395 products

Lever Switches

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

130 products

Rocker Switches

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

121 products

Snap-Acting Switches

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

206 products

Switch Contact Blocks

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

40 products

Limit Switches

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

153 products

Motor Switches

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

45 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

260 products

Emergency Stop Switches

Cut power to equipment during emergencies

143 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

Slide Switches

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

1 product

Proximity Sensors

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

394 products

Magnetic Switches

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

120 products

Doorbell Switches

Activate doorbells or buzzers with the push of a button

22 products

Key Switches

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

77 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

108 products

Ethernet Switches

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

68 products

Safety Switches

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

59 products

Switch Guards

Prevent people from activating switches accidentally

2 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

26 products

Pull-Chain Switches

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

1 product

Switch Mats

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

45 products

Tilt Switches

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

8 products

Battery Switches

Turn the knob to alternate between two batteries without interrupting power

1 product

Toggle Switch Covers

Completely cover toggle switches to protect them from moisture and dust

16 products

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

263 products

Joystick Switches

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

15 products

Pull Switches

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

4 products

Enclosure Door Switches

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

2 products

Air-Actuated Switches

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

13 products

DIP Switches

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

7 products

Transfer Switches

Switch to backup power during an outage

7 products

Vibration Switches

Monitor vibration in machinery and shut it down or sound an alarm if levels rise

4 products

Speed-Monitoring Switches

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

3 products

Toggle Switch Seals

Seal dust and moisture out of switches while leaving the toggle exposed

6 products

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

5 products

Push-Button Switch Covers

Completely cover push-button switches to protect them from moisture and dust

11 products

Bumper Switches

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

31 products

Touch-Pad Switches

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

4 products

Fingerprint Scanners

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

3 products

Proximity Sensor Safety Barriers

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

2 products

Photoelectric Sensor Reflectors

Pair with reflector photoelectric sensors to bounce light back at them

38 products

Enabling Switches

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

18 products

Automatic Door Switches

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

12 products

Ribbon Switches

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

15 products

Switch Receivers

Pair with switches to set up wireless controls that cut power to machinery in case of emergency

5 products

Rocker Switch Covers

Completely cover rocker switches to protect them from moisture and dust

14 products

Ultrasonic Sensors

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

20 products

Switch Padding

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

4 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

44 products

Cylinder Position Sensors

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

8 products

HMIs

Control PLCs, inverters, and other automated equipment

1 product

PLCs

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

37 products

PLC Expansion Modules

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

40 products

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

Potentiometers

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

26 products

IO Link Programmers

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

1 product

Control Panels

Connect and monitor your fire alarm system

1 product

Motor Speed Controls

Manage the speed of AC and DC motors

37 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

Motor Starter Overload Protectors

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

8 products

Tablet Holders

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

3 products

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

4 products

Relays

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

366 products

Timer Relays

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

202 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 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

Monitoring Relays

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

31 products

Latching Relays

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

27 products

Vehicle Relays

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

36 products

Safety Relays

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

60 products

Infrequent-Cycle Relays

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

147 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 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

1 product

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

Power Receptacles

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

70 products

Strain-Relief Connector Boots

Protect connectors and cords from strain, bends, and pulls

2 products

Data Connection Hubs

Add USB, DisplayPort, or HDMI ports to your computer to connect multiple device

28 products

Power Cords

Connect equipment and devices to a power source

2 products

Outlet Boxes

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

8 products

Console Enclosures

Build out interfaces with buttons, gauges, and other components to monitor and control machinery

9 products

Battery Chargers

Charge everything from large-cell to cordless tool to household batteries

54 products

Fluid Handling

Directional Control Valves

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

420 products

Float Switches

Start process equipment such as pumps and motors when the liquid in your tank reaches the float

130 products

Float Switch Relays

Amplify current to actuate equipment that has a higher current rating than your float switch

2 products

Flow Switches

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

177 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

29 products

On-Off Valves

Start and stop flow through a line

15 products

Air-Exhaust Valves

Vent or divert exhaust to speed up the operation of air cylinders, actuators, and other equipment

104 products

Paddle Level Switches

Actuate when the paddle stops rotating to indicate the level of dry material

6 products

Pressure Switches

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

310 products

Differential Pressure Switches

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

53 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

6 products

Humidity Controllers

Monitor humidity and control it by automatically turning equipment on and off

2 products

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

Humidistats

Control the humidity in an enclosure or space

6 products

Water Heater Thermostats

Replace the thermostat on your water heater

3 products

Noncontact Temperature Sensor Transmitters

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

5 products

Flow Transmitters

Send flow rate measurements to PLCs, data loggers, and remote displays

84 products

Pressure and Vacuum Transmitters

Convert pressure and vacuum measurements into a signal sent to remote displays and controllers

23 products

Lighting

Light Switches

Manually turn lights on and off

65 products

Light Switch/Receptacles

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

3 products

Light Dimmers

Adjust the brightness of lights, even in large workspaces

18 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 Sockets

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

47 products

Light Socket Pull Cords

Lengthen pull-chain light switches

1 product

Measuring and Inspecting

Rotary Switches

Control multiple devices with a single switch

13 products

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 Covers

Prevent dirt buildup on infrared thermometer transmitters

1 product

Thermometer Insulating Tubes

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

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

Heating, Ventilation, and Air Conditioning

HVAC Switches

Control and monitor airflow in HVAC systems automatically

3 products

Thermostats

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

72 products

HVAC Flame Detectors

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

1 product

Building and Machinery Hardware

Indicating Knobs

Control devices and view settings at a glance

89 products

Mechanical Control Cables

Weave around obstructions to operate valves, throttles, and other machinery from a distance

97 products

Garage Door Opener Receivers

Wire to automatic overhead door openers to accept signals from remote and keypad transmitters

1 product

Garage Door Opener Transmitters

Send signals to receivers to open and close automatic overhead door openers

8 products

Garage Door Opener Internet Gateways

Use a smartphone or computer to control automatic overhead door openers

1 product

Positioning Arms

Mount and position tools and other small equipment

4 products

Brackets

Connect surfaces in an assembly

64 products

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

18 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

6 products

Fire Alarm Pull Stations

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

5 products

Fire Alarm Station Covers

Shield your fire alarm pull stations from damage and tampering

4 products

Material Handling

Chain Hoist Replacement Parts

Replace brake coils and discs, control pendants, and other parts on electric chain hoists

51 products

Conveyor Accessory Mounts

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

54 products

Communication

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 Alarms

Everything from bells and whistles to horns and sirens

8 products

Fabricating and Machining

Abrasive Blaster Safety Switches

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

11 products

Facility and Grounds Maintenance

Mirrors

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

10 products

Power Transmission

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

12 products