Switches | McMaster-Carr

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2B999

5A991

EAR99

DFARS Specialty Metals

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8,179 Products

Electrical

Manual Switches

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

1,266 products

Manual Switch Contact Blocks

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

40 products

Manual Switch Covers

Completely cover switches to protect them from moisture and dust

42 products

Manual Switch Seals

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

6 products

Snap-Acting Switches

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

211 products

Limit Switches

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

149 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

215 products

Sensor Switches

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

682 products

Switch Safety Barriers

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

2 products

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

38 products

Magnetic Switches

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

88 products

Relays

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

718 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

99 products

Ethernet Switches

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

68 products

Potentiometers

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

26 products

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

4 products

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

Safety Switches

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

39 products

HMIs

Control PLCs, inverters, and other automated equipment

1 product

Switch Guards

Prevent people from activating switches accidentally

2 products

Tilt Switches

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

8 products

PLCs

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

9 products

PLC Input and Output Modules

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

10 products

Speed-Monitoring Switches

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

1 product

IO Link Programmers

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

1 product

Timer Relays

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

198 products

Vibration Switches

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

4 products

Fusible Link Switches

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

5 products

Switch Mounts

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

5 products

Control Panels

Connect and monitor your fire alarm system

1 product

Transfer Switches

Switch to backup power during an outage

5 products

Light Curtain Cords

Connect multiple light curtains in a row

4 products

Light Curtain Brackets

Swivel a transmitter and receiver from side-to-side for easier alignment during installation

1 product

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

11 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

Motor Speed Controls

Manage the speed of AC and DC motors

37 products

Bumper Switches

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

23 products

Tablet Holders

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

3 products

Switch Padding

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

4 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 products

Switch Receivers

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

4 products

Sensor Switch Transmitters

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

16 products

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

449 products

Data Connection Hubs

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

28 products

Electrical Receptacles

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

70 products

Electrical Cords

Connect equipment and devices to a power supply

2 products

Electrical Connector Boots

Protect connectors and cords from strain, bends, and pulls

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

3 products

Battery Chargers

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

60 products

Fluid Handling

Directional Control Valves

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

421 products

Float Switches

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

122 products

Float Switch Relays

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

2 products

On-Off Valves

Start and stop flow through a line

17 products

Flow Switches

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

171 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

25 products

Paddle Level Switches

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

6 products

Air-Exhaust Valves

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

68 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

93 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

137 products

Humidistats

Control the humidity in an enclosure or space

6 products

Noncontact Temperature Sensors

Monitor the temperature of hazardous, sensitive, and hard-to-reach materials without touching them

5 products

Water Heater Thermostats

Replace the thermostat on your water heater

3 products

Pressure Switches

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

300 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

27 products

Pressure and Vacuum Switches

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

6 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

22 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 Sensors

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

75 products

Light Switch/Receptacles

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

2 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

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

1 product

Thermometer Cooling Jackets

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

1 product

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

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

Building and Machinery Hardware

Garage Door Opener Transmitters

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

8 products

Garage Door Opener Receivers

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

1 product

Garage Door Opener Internet Gateways

Use a smartphone or computer to control automatic overhead door openers

1 product

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

Positioning Arms

Mount and position tools, small electronics, and displays

4 products

Brackets

Connect surfaces in an assembly

64 products

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

18 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

67 products

HVAC Flame Detectors

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

1 product

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

48 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

3 products

Fire Alarm Pull Stations

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

3 products

Fire Alarm Station Covers

Shield your fire alarm pull stations from damage and tampering

4 products

Fabricating and Machining

Abrasive Blaster Safety Switches

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

6 products

Communication

Legend Plates

Mark switches and lights on control panels for easy identification

14 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

2 products

Audible Alarms

Everything from bells and whistles to horns and sirens

5 products

Power Transmission

Air Cylinders

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

12 products