Screw Terminal Switches | McMaster-Carr

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2,315 Products

Electrical

Manual Switches

Manual Switches

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

Motor Switches

Turn motors, lighting, and electric heat 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

Light Switches

Manually turn lights on and off

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

Ethernet Switches

Ethernet Switches

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

Safety Switches

Safety Switches

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

Light Dimmers

Adjust the brightness of lights, even in large workspaces

Relays

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

Timer Switches

Automatically turn electrical equipment on or off after a set interval

Potentiometers

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

Programmable Logic Controllers

Programmable Logic Controllers

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

Programmable Logic Controller Expansion Modules

Programmable Logic Controller Expansion Modules

Increase the number of inputs and outputs for your PLC

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

Sensor Switches

Sensor Switches

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

Switch Safety Barriers

Switch Safety Barriers

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

Transfer Switches

Transfer Switches

Switch to backup power during an outage

Timer Relays

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

Magnetic Switches

Magnetic Switches

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

Motor Speed Controls

Motor Speed Controls

Manage the speed of AC and DC motors

Motor Voltage Monitors

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

Light Switch Sensors

Light Switch Sensors

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

Circuit Breakers

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

Fluid Handling

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

Water Heater Thermostats

Water Heater Thermostats

Replace the thermostat on your water heater

Humidistats

Control the humidity in an enclosure or space

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

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

Lighting

Light Sockets

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

Heating, Ventilation, and Air Conditioning

Thermostats

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

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