Electrical Controls | McMaster-Carr

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8,365 Products

Electrical

Manual Switches

Manual Switches

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

Manual Switch Contact Blocks

Manual Switch Contact Blocks

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

Relays

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

Snap-Acting Switches

Snap-Acting Switches

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

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

Sensor Switches

Sensor Switches

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

Light Switches

Manually turn lights on and off

Potentiometers

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

Switch Guards

Prevent people from activating switches accidentally

Timer Relays

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

Motor Starters

Turn motors on and off and protect them from current overloads

Light Dimmers

Adjust the brightness of lights, even in large workspaces

Motor Switches

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

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

Timer Switches

Automatically turn electrical equipment on or off after a set interval

Programmable Logic Controllers

Programmable Logic Controllers

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

Programmable Logic Controller End Plates

Programmable Logic Controller End Plates

Pair with PLCs to tell your processor there are no more inputs or outputs; protect PLCs from debris

Programmable Logic Controller Communication Modules

Programmable Logic Controller Communication Modules

Connect and communicate simultaneously with multiple automation devices

Programmable Logic Controller Input and Output Modules

Programmable Logic Controller Input and Output Modules

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

Programmable Logic Controller Expansion Modules

Programmable Logic Controller Expansion Modules

Increase the number of inputs and outputs for your PLC

Control Panels

Connect and monitor your fire alarm system

Light Switch Sensors

Light Switch Sensors

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

Speed-Monitoring Switches

Speed-Monitoring Switches

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

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

Motor Speed Controls

Motor Speed Controls

Manage the speed of AC and DC motors

Transfer Switches

Transfer Switches

Switch to backup power during an outage

Switch Mounts

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

IO Link Connectors

IO Link Connectors

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

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

Motor Drives

Receive signals from a motor controller and deliver them to your stepper motor

Current Relays

Prevent AC current overload in equipment such as motors and heaters

Motor Voltage Monitors

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

Motor Controllers

Motor Controllers

Store and run programs and send signals to a driver to control the motion of a stepper motor

Fusible Link Switches

Fusible Link Switches

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

Transistors

Boost weak electrical signals and rapidly control data transmission

Conductivity Controllers

Conductivity Controllers

Turn pumps, mixers, and valves on and off based on a solution’s conductivity

Electrical Connectors and Cords

Electrical Connectors and Cords

Supply power to equipment by combining plugs, sockets, receptacles, and cords

Terminals

Attach to the end of wire to connect circuits in control panels, motors, and small machines

Power Supplies

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

Rectifiers

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

Circuit Breakers

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

Diodes

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

Current Conditioners

Current Conditioners

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

Varistors

Protect sensors, programmable logic controllers, and other small components from electrical surges

Outlet Boxes

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

Light Switch/Receptacles

Light Switch/Receptacles

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

Fluid Handling

Directional Control Valves

Directional Control Valves

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

On-Off Valves

Start and stop flow through a line

Level Sensor Switches

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

Air Pulse Valves

Air Pulse Valves

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

Flow Switches

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

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

Stepper Motors

Motor shaft turns in small, equal increments for precise positioning

Electric Motors

Electric Motors

Keep machinery and equipment moving with AC or DC power

Servomotors

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

Stepper Gearmotors

Stepper Gearmotors

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

Electric Gearmotors

Electric Gearmotors

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

Torque Limiters

Torque Limiters

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

Clutches

Start and stop the transmission of power to machinery

Brakes

Control how much and how quickly your drive system slows down

Clutch/Brakes

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

Electric Actuators

Electric Actuators

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

Positioning Slides

Positioning Slides

A lead screw drives the carriage for accurate positioning in laboratory and production equipment

Lighting

Light Socket Pull Cords

Light Socket Pull Cords

Lengthen pull-chain light switches

Light Sockets

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

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

Safety Equipment

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

Fire Alarm Pull Stations

Fire Alarm Pull Stations

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

Building and Machinery Hardware

Indicating Knobs

Indicating Knobs

Control devices and view settings at a glance

Brackets

Connect surfaces in an assembly

Garage Door Openers

Garage Door Openers

Automatically open and close overhead doors; also known as jackshafts

Door Openers

Automatically open doors with a slight nudge

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

Communication

Speaker Volume Controls

Speaker Volume Controls

Wire between your speakers and sound amplifier to adjust the volume

Audible Alarms

Everything from bells and whistles to horns and sirens

Material Handling

Robot Safety Padding

Robot Safety Padding

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

Tablet Holders

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

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

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