Electrical Control Devices | McMaster-Carr

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Electrical Connection

1" Circular Connector

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8-Pin Circular DIN

DIN Valve Connection

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9,864 Products

Most Likely Products

Switch Contact Blocks

Switch Contact Blocks

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

Power Receptacles

Power Receptacles

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

Directional Control Valves

Directional Control Valves

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

Disconnect Switches

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

I/O Modules

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

All Results

Electrical Power, Networking, and Controlling

Switch Contact Blocks

Switch Contact Blocks

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

Disconnect Switches

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

Magnetic Switches

Magnetic Switches

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

Safety Switches

Safety Switches

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

Switch Padding

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

Push-Button Switches

Push-Button Switches

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

Proximity Sensors

Proximity Sensors

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

Snap-Acting Switches

Snap-Acting Switches

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

Safety Light Curtains

Safety Light Curtains

Immediately cut power to machinery when anything blocks the light beam

Tilt Switches

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

Bumper Switches

Bumper Switches

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

Switch Guards

Prevent people from activating switches accidentally

Timer Switches

Automatically turn electrical equipment on or off after a set interval

Photoelectric Sensor Reflectors

Photoelectric Sensor Reflectors

Pair with reflector photoelectric sensors to bounce light back at them

Limit Switches

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

RFID Reader/Writers

RFID Reader/Writers

Scan RFID tags to sort inventory, track items, and control building access

Speed-Monitoring Switches

Speed-Monitoring Switches

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

Motor Switches

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

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

Linear Position Sensors

Linear Position Sensors

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

Rotary Switches

Rotary Switches

Control multiple devices with a single switch

Transfer Switches

Transfer Switches

Switch to backup power during an outage

RFID Readers

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

Touch-Pad Switches

Touch-Pad Switches

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

Lever Switches

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

Ribbon Switches

Ribbon Switches

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

Switch Mats

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

Enabling Switches

Enabling Switches

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

Toggle Switches

Toggle Switches

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

Rocker Switches

Rocker Switches

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

Foot Switches

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

Emergency Stop Switches

Emergency Stop Switches

Cut power to equipment during emergencies

Pendant Switches

Pendant Switches

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

Pull Switches

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

Doorbell Switches

Doorbell Switches

Activate doorbells or buzzers with the push of a button

Finger-Touch Switches

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

Slide Switches

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

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

Key Switches

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

Battery Switches

Battery Switches

Turn the knob to alternate between two batteries without interrupting power

Air-Actuated Switches

Air-Actuated Switches

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

Fingerprint Scanners

Fingerprint Scanners

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

Enclosure Door Switches

Enclosure Door Switches

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

Pull-Chain Switches

Pull-Chain Switches

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

Photoelectric Sensors

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

Automatic Door Switches

Automatic Door Switches

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

Cylinder Position Sensors

Cylinder Position Sensors

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

Ultrasonic Sensors

Ultrasonic Sensors

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

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

Relay Sockets

Quickly mount relays to DIN rail or flat surfaces

Monitoring Relays

Monitoring Relays

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

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

Vehicle Relays

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

Latching Relays

Latching Relays

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

Infrequent-Cycle Relays

Infrequent-Cycle Relays

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

Air-Actuated Relays

Air-Actuated Relays

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

Safety Relays

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

Alternating Relays

Alternating Relays

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

Proportional-Control Relays

Proportional-Control Relays

Gradually adjust output instead of turning on or off

PLCs

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

VFDs

Control the speed and torque of AC electric motors

Potentiometers

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

Control Panels

Connect and monitor your fire alarm system

Motor Starters

Turn motors on and off and protect them from current overloads

Motor Starter Overload Protectors

Motor Starter Overload Protectors

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

Motor Voltage Monitors

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

Stepper Motor Drives

Stepper Motor Drives

Control the speed and position of stepper motors

IO-Link Programmers

IO-Link Programmers

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

DC Motor Drives

DC Motor Drives

Control the speed and torque of DC electric motors

Diodes

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

Power Receptacles

Power Receptacles

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

I/O Modules

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

Ecomate Connectors

Ecomate Connectors

Connect machine tools, robots, and other vibrating equipment

Audio Connectors

Audio Connectors

Plugs, sockets, receptacles, and adapters to make audio connections

CB Radio Connectors

CB Radio Connectors

Sockets and receptacles to connect CB radios

RJ45 Connectors

RJ45 Connectors

Plugs, sockets, and receptacles to make Ethernet connections

Metric Circular Connectors

Metric Circular Connectors

Plugs, sockets, receptacles, and adapters for equipment with metric connections

D-Sub Connectors

D-Sub Connectors

Plugs, sockets, receptacles, and adapters for connecting computers, monitors, and printers

Solenoid Valve Receptacles

Solenoid Valve Receptacles

Pair with plugs or sockets to connect solenoid components

USB Receptacles

USB Receptacles

Install in an outlet box to charge multiple devices

Mil. Spec. Receptacles

Mil. Spec. Receptacles

Install in walls and panels and pair with Mil. Spec. plugs

Mini Receptacles

Mini Receptacles

Install in walls and panels and pair with plugs to send power and signal

Power Cords

Connect equipment and devices to a power source

Outlet Boxes

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

Power Supplies

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

Fusible Link Switches

Fusible Link Switches

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

Current Conditioners

Current Conditioners

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

Circuit Breakers

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

Rectifiers

Convert AC voltage to a constant DC voltage on a circuit board

Fluid Handling

Directional Control Valves

Directional Control Valves

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

Level Sensor Switches

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

Flow Switches

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

Air Pulse Valves

Air Pulse Valves

Convert continuous flow into bursts that reduce air consumption in dryers and dust collectors

Solenoid On/Off Valves

Solenoid On/Off Valves

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

Liquid-Dispensing Metering Valves

Liquid-Dispensing Metering Valves

Program to dispense a specific amount of liquid every time and shut off when set amount is reached

Temperature Switches

Temperature Switches

Turn heating equipment on or off at a specified temperature

Temperature Controllers

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

Power Transmission

Clutch/Brakes

Control when to transmit power with a clutch and when to hold a load in place with a brake

Brakes

Control how much and how quickly your drive system slows down

Clutches

Start and stop the transmission of power to machinery

Torque Limiters

Torque Limiters

Keep torque at or below a set limit to control tension or braking or protect machinery from overload

Electric Actuators

Electric Actuators

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

Electric Gearmotors

Electric Gearmotors

A motor and speed reducer in one to slow speed and increase torque in AC- or DC- power applications

Servomotors

Create rotary motion with accurate positioning and fine control over speed and torque

Stepper Motors

The motor shaft turns in small, equal increments for precise positioning

Electric Motors

Electric Motors

Keep machinery and equipment moving with AC or DC power

Stepper Gearmotors

Stepper Gearmotors

Stepper motor and gearbox in one for high torque in areas large motors won’t fit

Electric Slides

Electric Slides

Move parts with precision in electronics, robotics, and other automated processes

Hydraulic On/Off Valves

Hydraulic On/Off Valves

Control the flow in high-pressure hydraulic systems

Lighting

Light Sockets

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

Light Switch/Receptacles

Light Switch/Receptacles

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

Light Switch Sensors

Light Switch Sensors

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

Light Dimmers

Adjust the brightness of lights, even in large workspaces

Light Socket Pull Cords

Light Socket Pull Cords

Lengthen pull-chain light switches

LED Drivers

Deliver the electrical current your LEDs need

Light Switches

Manually turn lights on and off

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 Retrofit Kits

Light Retrofit Kits

Upgrade to energy-efficient LED lights without completely replacing old fixtures

Measuring and Inspecting

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

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

Heating, Ventilation, and Air Conditioning

HVAC Flame Detectors

HVAC Flame Detectors

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

Building and Machinery Hardware

Door Openers

Automatically open doors with a slight nudge

Garage Door Openers

Garage Door Openers

Automatically open and close overhead doors; also known as jackshafts

Brackets

Connect surfaces in an assembly

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

Safety Equipment

Fire Alarm Pull Stations

Fire Alarm Pull Stations

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

Smoke Detector Test Stations

Smoke Detector Test Stations

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

Smoke Detectors

Smoke Detectors

Warn people when there's smoke in your facility

Communication

Audible Alarms

Everything from bells and whistles to horns and sirens

Tablet Holders

Walk around your facility with your tablet firmly in hand

Speaker Volume Controls

Speaker Volume Controls

Wire between your speakers and sound amplifier to adjust the volume

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