SPDT Switches | McMaster-Carr

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DFARS Specialty Metals

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1,288 Products

Electrical Power, Networking, and Controlling

Toggle Switches

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

40 products

Push-Button Switches

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

28 products

Snap-Acting Switches

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

147 products

Limit Switches

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

87 products

Rocker Switches

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

27 products

Foot Switches

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

40 products

Timer Switches

Automatically turn electrical equipment on or off after a set interval

15 products

Lever Switches

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

1 product

Pendant Switches

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

4 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

4 products

Speed-Monitoring Switches

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

1 product

Key Switches

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

9 products

Transfer Switches

Switch to backup power during an outage

5 products

Vibration Switches

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

1 product

Magnetic Switches

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

24 products

Air-Actuated Switches

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

2 products

Emergency Stop Switches

Cut power to equipment during emergencies

6 products

Switch Contact Blocks

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

1 product

Pull Switches

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

1 product

Enabling Switches

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

8 products

Sensor Switches

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

7 products

Relays

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

76 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

Potentiometers

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

2 products

Timer Relays

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

64 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

18 products

Monitoring Relays

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

20 products

Vehicle Relays

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

19 products

Air-Actuated Relays

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

1 product

Fusible Link Switches

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

10 products

Fluid Handling

Pressure Switches

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

235 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

23 products

Pressure and Vacuum Switches

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

3 products

Humidity Controllers

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

1 product

Temperature Switches

Turn heating equipment on or off at a specified temperature

28 products

Humidistats

Control the humidity in an enclosure or space

6 products

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

19 products

Flow Switches

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

128 products

Float Switches

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

22 products

Float Switch Relays

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

2 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

18 products

Paddle Level Switches

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

6 products

Lighting

Light Switch/Receptacles

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

1 product

Light Switches

Manually turn lights on and off

2 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

19 products