Switches | McMaster-Carr

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System of Measurement

Switching Voltage

0.2V AC to 400V AC

6V AC to 400V AC

12V AC to 140V AC

12V AC to 240V AC

12V AC to 250V AC

12V AC to 275V AC

12V AC to 277V AC

24V AC to 240V AC

24V AC to 264V AC

24V AC to 265V AC

24V AC to 280V AC

24V AC to 420V AC

Number of Terminals

Switch Action

Switching Current

Number of Positions

Position Designation

Off-on-on-on-On

Off-on-on-on-on-On

Number of Circuits Controlled

Switch Designation

Panel Cutout Diameter

Wire Connection

Standard Banana

Environment

Food and Beverage

High Temperature

High-Pressure Washdown

High-Temperature Washdown

Illumination

Not Illuminated

Switch Starting Position

Electrical Connection

1/2" Circular Connector

DIN Valve Connection

Flat-Pin Mini Thermocouple Connector

Metric Circular

Mounting Location

Electrical Receptacle

Color

Actuator Color

Voltage

18V AC to 30V AC

20V AC to 30V AC

24V AC to 30V AC

24V AC to 250V AC

24V AC to 277V AC

100V AC to 240V AC

Push-Button Style

RoHS

Compliant with Exemptions

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

REACH

Export Control Classification Number (ECCN)

DFARS Specialty Metals

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8,353 Products

Electrical Power, Networking, and Controlling

Toggle Switches

Toggle Switches

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

Push-Button Switches

Push-Button Switches

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

Lever Switches

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

Rocker Switches

Rocker Switches

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

Snap-Acting Switches

Snap-Acting Switches

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

Switch Contact Blocks

Switch Contact Blocks

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

Limit Switches

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

Disconnect Switches

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

Motor Switches

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

Emergency Stop Switches

Emergency Stop Switches

Cut power to equipment during emergencies

Slide Switches

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

Foot Switches

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

Rotary Switches

Rotary Switches

Control multiple devices with a single switch

Magnetic Switches

Magnetic Switches

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

Pendant Switches

Pendant Switches

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

Proximity Sensors

Proximity Sensors

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

Key Switches

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

Timer Switches

Automatically turn electrical equipment on or off after a set interval

Doorbell Switches

Doorbell Switches

Activate doorbells or buzzers with the push of a button

Switch Guards

Prevent people from activating switches accidentally

Finger-Touch Switches

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

Safety Switches

Safety Switches

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

Ethernet Switches

Ethernet Switches

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

Battery Switches

Battery Switches

Turn the knob to alternate between two batteries without interrupting power

Pull-Chain Switches

Pull-Chain Switches

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

Tilt Switches

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

Switch Mats

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

Enclosure Door Switches

Enclosure Door Switches

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

DIP Switches

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

Joystick Switches

Joystick Switches

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

Photoelectric Sensors

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

Pull Switches

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

Toggle Switch Covers

Toggle Switch Covers

Completely cover toggle switches to protect them from moisture and dust

Air-Actuated Switches

Air-Actuated Switches

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

Transfer Switches

Transfer Switches

Switch to backup power during an outage

Touch-Pad Switches

Touch-Pad Switches

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

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

Push-Button Switch Covers

Push-Button Switch Covers

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

Vibration Switches

Vibration Switches

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

Toggle Switch Seals

Toggle Switch Seals

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

Speed-Monitoring Switches

Speed-Monitoring Switches

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

Enabling Switches

Enabling Switches

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

Bumper Switches

Bumper Switches

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

Fingerprint Scanners

Fingerprint Scanners

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

Photoelectric Sensor Reflectors

Photoelectric Sensor Reflectors

Pair with reflector photoelectric sensors to bounce light back at them

Proximity Sensor Safety Barriers

Proximity Sensor Safety Barriers

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

Automatic Door Switches

Automatic Door Switches

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

Ribbon Switches

Ribbon Switches

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

Switch Receivers

Switch Receivers

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

Rocker Switch Covers

Rocker Switch Covers

Completely cover rocker switches to protect them from moisture and dust

Switch Padding

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

Ultrasonic Sensors

Ultrasonic Sensors

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

Cylinder Position Sensors

Cylinder Position Sensors

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

Safety Light Curtain Mirrors

Safety Light Curtain Mirrors

Deflect beams from a set of safety barrier switches to form a perimeter around machinery

Safety Light Curtains

Safety Light Curtains

Immediately cut power to machinery when anything blocks the light beam

PLCs

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

PLC Expansion Modules

PLC Expansion Modules

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

Motor Starters

Turn motors on and off and protect them from current overloads

Potentiometers

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

IO-Link Programmers

IO-Link Programmers

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

Control Panels

Connect and monitor your fire alarm system

DC Motor Drives

DC Motor Drives

Control the speed and torque of DC electric motors

Motor Voltage Monitors

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

Motor Starter Overload Protectors

Motor Starter Overload Protectors

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

Potentiometer Panel Seals

Potentiometer Panel Seals

Keep moisture and dust out of potentiometers

Linear Position Sensors

Linear Position Sensors

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

VFDs

Control the speed and torque of AC electric motors

HMIs

Control PLCs, inverters, and other automated equipment

Relays

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

Timer Relays

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

Proportional-Control Relays

Proportional-Control Relays

Gradually adjust output instead of turning on or off

Safety Relays

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

Interface Relays

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

Lighting Relays

Lighting Relays

Control lighting circuits and switch lighting systems on or off

Latching Relays

Latching Relays

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

Monitoring Relays

Monitoring Relays

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

Vehicle Relays

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

Air-Actuated Relays

Air-Actuated Relays

Convert an air signal on a pneumatic control system to an electric one

Infrequent-Cycle Relays

Infrequent-Cycle Relays

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

Alternating Relays

Alternating Relays

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

Transistors

Boost weak electrical signals and rapidly control data transmission

Circuit Breakers

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

Fusible Link Switches

Fusible Link Switches

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

Power Receptacles

Power Receptacles

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

Strain-Relief Connector Boots

Strain-Relief Connector Boots

Protect connectors and cords from strain, bends, and pulls

Data Connection Hubs

Data Connection Hubs

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

Power Cords

Connect equipment and devices to a power source

Outlet Boxes

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

Enclosure Thermostats

Enclosure Thermostats

Control temperatures in an enclosure to protect electronics

Console Enclosures

Console Enclosures

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

Battery Chargers

Battery Chargers

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

Fluid Handling

Pressure Switches

Pressure Switches

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

Differential Pressure Switches

Differential Pressure Switches

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

Vacuum Switches

Vacuum Switches

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

Pressure and Vacuum Switches

Pressure and Vacuum Switches

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

Directional Control Valves

Directional Control Valves

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

Float Switches

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

Flow Switches

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

Level Sensor Switches

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

Manual On/Off Valves

Manual On/Off Valves

Start and stop flow through a line

Air-Exhaust Valves

Air-Exhaust Valves

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

Paddle Level Switches

Paddle Level Switches

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

Solenoid On/Off Valves

Solenoid On/Off Valves

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

Float Switch Relays

Float Switch Relays

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

Humidity Controllers

Humidity Controllers

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

Temperature Controllers

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

Temperature Switches

Temperature Switches

Turn heating equipment on or off at a specified temperature

Humidistats

Control the humidity in an enclosure or space

Water Heater Thermostats

Water Heater Thermostats

Replace the thermostat on your water heater

Noncontact Temperature Sensor Transmitters

Noncontact Temperature Sensor Transmitters

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

Flow Transmitters

Flow Transmitters

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

Pressure and Vacuum Transmitters

Pressure and Vacuum Transmitters

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

Lighting

Light Switches

Manually turn lights on and off

Light Switch/Receptacles

Light Switch/Receptacles

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

Light Dimmers

Adjust the brightness of lights, even in large workspaces

Light Switch Sensors

Light Switch Sensors

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

Light Switch Sensor Controllers

Light Switch Sensor Controllers

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

Light Switch Sensor Guards

Light Switch Sensor Guards

Protect light switch sensors from damage and vandalism

Light Sockets

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

Light Socket Pull Cords

Light Socket Pull Cords

Lengthen pull-chain light switches

Building and Machinery Hardware

Mechanical Control Cables

Mechanical Control Cables

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

Indicating Knobs

Indicating Knobs

Control devices and view settings at a glance

T-Slotted Framing Switches

T-Slotted Framing Switches

Attach to your rail to actuate components or cut power

Garage Door Opener Receivers

Garage Door Opener Receivers

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

Garage Door Opener Internet Gateways

Garage Door Opener Internet Gateways

Use a smartphone or computer to control automatic overhead door openers

Garage Door Opener Transmitters

Garage Door Opener Transmitters

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

Positioning Arms

Positioning Arms

Mount and position tools and other small equipment

Brackets

Connect surfaces in an assembly

Cam Locks

Unlock with a key, magnetic fob, screwdriver, or number combination

Heating, Ventilation, and Air Conditioning

HVAC Switches

Control and monitor airflow in HVAC systems automatically

Thermostats

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

HVAC Flame Detectors

HVAC Flame Detectors

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

Safety Equipment

Smoke Detector Test Stations

Smoke Detector Test Stations

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

Fire Alarm Pull Stations

Fire Alarm Pull Stations

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

Fire Alarm Station Covers

Fire Alarm Station Covers

Shield your fire alarm pull stations from damage and tampering

Smoke Detectors

Smoke Detectors

Warn people when there's smoke in your facility

Measuring and Inspecting

Thermometer Air Purges

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

Thermometer Cooling Jackets

Thermometer Cooling Jackets

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

Thermometer Covers

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

Thermometer Insulating Tubes

Thermometer Insulating Tubes

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

Signal Output Testers

Signal Output Testers

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

Decade Boxes

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

Material Handling

Chain Hoist Replacement Parts

Chain Hoist Replacement Parts

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

Conveyor Accessory Mounts

Conveyor Accessory Mounts

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

Communication

Legend Plates

Mark switches and lights on control panels for easy identification

Speaker Volume Controls

Speaker Volume Controls

Wire between your speakers and sound amplifier to adjust the volume

RFID Readers

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

Audible Alarms

Everything from bells and whistles to horns and sirens

Fabricating and Machining

Abrasive Blaster Safety Switches

Abrasive Blaster Safety Switches

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

Power Transmission

Air Cylinders

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

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)