Switch Knobs | McMaster-Carr

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487 Products

Choosing an Electrical Switch

Indicating Knobs

Control devices with round or D-shaped shafts and view settings at a glance with a pointer.

Comfort-Grip Indicating Knobs

A rubber coating or construction provides a comfortable grip. Use these knobs to control devices with round or D-shaped shafts and view settings at a glance with a pointer.

Choose-a-Color Indicating Knobs

Quickly identify equipment controls and components by their color. Use these knobs to control devices with round shafts and view settings at a glance with a pointer.

Dual-Control Comfort-Grip Indicating Knobs

These dual-control knobs operate independently to control two settings. They have a rubber coating for a comfortable grip. Use them on devices with round shafts to view settings at a glance with a pointer.

Turn-Counting Indicating Knobs

For monitoring the number of shaft turns on instrumentation, these knobs have easy-to-read scales or digits for quick and accurate readings. Use them on devices with round shafts.

Screw-Head Mount Precise-Control Knobs

To build a custom precise-control knob or thumb screw, pair one of these knobs with a socket head screw. Turn the knob to move the screw 0.005" per graduation and make precise adjustments.

Threaded-Stud Precise-Control Knobs

Mount these knobs into a threaded hole. Turn the knob to move the stud 0.005" per graduation and make precise adjustments.

Manual Switches

Plastic 30 mm Panel-Mount Lever Switches

Prevent accidental actuation from bumps or jostles—these switches require you grip and twist a lever to turn them on or off. Install them in 30 mm dia. cutouts.

Metal 30 mm Panel-Mount Lever Switches

Rated NEMA 4, 13, and IP66, these metal switches are protected from washdowns and oil/coolant spraying. Install them in 30 mm dia. cutouts.

Hazardous Location 30 mm
Panel-Mount Lever Switches

Made for areas where ignitable gas and vapor may be present, these switches have a housing that seals in anything that could spark flammable material.

Metal 22 mm Panel-Mount Lever Switches

Grip and twist a lever to turn these switches on or off—they’re designed to prevent accidental actuation. Install them into standard-sized panel cutouts.

Plastic 22 mm Panel-Mount Lever Switches

These switches are protected from corrosion, high-temperature and high-pressure washdowns, and oil/coolant spraying. Install them in 22 mm dia. cutouts.

Vibration-Resistant 22 mm
Panel-Mount Lever Switches

Prevent accidental actuation from bumps or vibration—these switches require you to grip and twist the lever to turn the switch. The contact block and actuator are all one piece, so they won’t separate in high-vibration applications.

Cam Panel-Mount Lever Switches

Thanks to their ability to handle higher current than switches with contact blocks, these switches are often found in applications from large motors to warehouse lighting systems.

16 mm Panel-Mount Lever Switches

Avoid accidental actuation—these switches won’t turn on or off until you grip and twist the lever. Install in a 16 mm dia. cutout.

Hazardous Location Enclosed Lever Switches

Use these switches where ignitable gas, dust, and fibers may be present. They're UL and C-UL listed for hazardous locations.

Plastic Enclosed Lever Switches

The enclosure not only protects these switches, but also adds options for how you install them.

Battery Knob Switches

Alternate between two batteries without interrupting power.

22 mm Panel-Mount Knob Switches

Turn these switches by hand.

22 mm Panel-Mount Build-Your-Own Metal Switches

Choose an actuator and contact block to make your own 22 mm metal switch.

22 mm Panel-Mount
Build-Your-Own Plastic Switches

Choose an actuator and contact block to make your own 22 mm plastic switch.

30 mm Panel-Mount Build-Your-Own Metal Switches

Choose an actuator and contact block to make your own 30 mm switch.

Rotary Switches

Control multiple devices with one switch. Turn the shaft to change switch positions.

22 mm Panel-Mount Key Switches

Sized for 22 mm dia. panel cutouts, these switches require a key to turn circuits on or off, limiting access to sensitive equipment.

Vibration-Resistant 22 mm
Panel-Mount Key Switches

To prevent accidental actuation and limit access to sensitive equipment, these switches require a key to turn circuits on or off. The contact block and actuator are all one piece, so they won’t separate in high-vibration applications.

Timer Switches

Wall-Mount Timer Switches

Use these switches in place of standard wall switches to automatically turn electrical equipment on or off after a set interval of time.

High-Current Wall-Mount Timer Switches

Control equipment with high currents such as air conditioners, heaters, and ventilation fans.

Time-Delay Wall-Mount Timer Switches

Control two devices and delay the shut off of one device by up to one hour. These switches are often used with lights and fans for ventilation.

Power-Saving Panel-Mount Timer Switches

Push and release the button to activate—no electricity required.

Panel-Mount Timer Switches

Install these switches in a panel cutout to automatically turn electrical equipment on or off after a set interval.

High-Visibility Timer Switches

The large face makes these switches easy to read from a distance.

Timer Switches

Automatically turn electrical equipment on or off after a set interval.

Potentiometers

Vary electrical flow to control speed, volume, and light intensity. Also known as variable output switches.

Digital Potentiometers

More precise than analog potentiometers, these have a three-digit display that is easy to read.

Harsh Environment Potentiometers

Rated NEMA 13, these potentiometers protect against debris and splashing oil and coolant.

Timer Relays

Solid State DIN-Rail Mount
Multifunction Interface Timer Relays

Considered solid state because they don’t have any moving parts, these timer relays last longer, switch faster, and are quieter than mechanical relays. They interface between your controller and components to isolate input and output circuits, preventing damage to your components from voltage spikes, amplifying the relay's signal, and reducing signal interference. They have multiple timing functions, so you don’t need to swap out your relay if you want to change their function.

Solid State DIN-Rail Mount Timer Relays

Mount these timer relays directly to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. Unlike mechanical relays, they have no moving parts, so they require less maintenance and last longer, are quieter, and switch faster.

Solid State DIN-Rail Mount
Multifunction Timer Relays

For fast installation, mount these relays directly to 35 mm DIN rail (also known as DIN 3 rail). With no moving parts, these solid state relays last longer and require less maintenance, are quieter, and switch faster than mechanical relays.

Timer Relays

Turn machinery, such as paint and conveyor lines, on and off after a set period of time.

Solid State Versa-Mount Multifunction Timer Relays

Install these relays in a panel cutout or plug them into a relay socket. Unlike mechanical relays, these solid state relays have no moving parts, so they require less maintenance and last longer, are quieter, and switch faster.

Multifunction Timer Relays

Get a variety of timing functions in a single relay.

DIN-Rail Mount Multifunction Interface Timer Relays

Protect components from voltage spikes while amplifying the relay’s signal and reducing interference for reliable transmission—these relays interface between your controller and system components to isolate the input and output circuits. They have multiple timing functions, so you don’t need to swap out your relay if you want to change their function.

Solid State Versa-Mount Timer Relays

Mount these timer relays in a panel cutout or plug them into a relay socket for quick installation. Capable of fast switching, they are solid state and have no moving parts, so they require less maintenance, last longer, and are quieter than mechanical relays.

Solid State Surface-Mount Timer Relays

Attach these relays to a flat surface using the mounting hole. They have no moving parts, so compared to mechanical switches, they require less maintenance, last longer, and are quieter.

Choosing an Electrical Switch

Knobs

Indicating Knobs

Comfort-Grip Indicating Knobs

Choose-a-Color Indicating Knobs

Dual-Control Comfort-Grip Indicating Knobs

Turn-Counting Indicating Knobs

Screw-Head Mount Precise-Control Knobs

Threaded-Stud Precise-Control Knobs

Manual Switches

Plastic 30 mm Panel-Mount Lever Switches

Metal 30 mm Panel-Mount Lever Switches

Hazardous Location 30 mmPanel-Mount Lever Switches

Metal 22 mm Panel-Mount Lever Switches

Plastic 22 mm Panel-Mount Lever Switches

Vibration-Resistant 22 mmPanel-Mount Lever Switches

Cam Panel-Mount Lever Switches

16 mm Panel-Mount Lever Switches

Hazardous Location Enclosed Lever Switches

Plastic Enclosed Lever Switches

Battery Knob Switches

22 mm Panel-Mount Knob Switches

22 mm Panel-Mount Build-Your-Own Metal Switches

22 mm Panel-MountBuild-Your-Own Plastic Switches

30 mm Panel-Mount Build-Your-Own Metal Switches

Rotary Switches

22 mm Panel-Mount Key Switches

Vibration-Resistant 22 mmPanel-Mount Key Switches

Timer Switches

Wall-Mount Timer Switches

High-Current Wall-Mount Timer Switches

Time-Delay Wall-Mount Timer Switches

Power-Saving Panel-Mount Timer Switches

Panel-Mount Timer Switches

High-Visibility Timer Switches

Timer Switches

Potentiometers

Potentiometers

Digital Potentiometers

Harsh Environment Potentiometers

Timer Relays

Solid State DIN-Rail MountMultifunction Interface Timer Relays

Solid State DIN-Rail Mount Timer Relays

Solid State DIN-Rail MountMultifunction Timer Relays

Timer Relays

Solid State Versa-Mount Multifunction Timer Relays

Multifunction Timer Relays

DIN-Rail Mount Multifunction Interface Timer Relays

Solid State Versa-Mount Timer Relays

Solid State Surface-Mount Timer Relays

Hazardous Location 30 mm
Panel-Mount Lever Switches

Vibration-Resistant 22 mm
Panel-Mount Lever Switches

22 mm Panel-Mount
Build-Your-Own Plastic Switches

Vibration-Resistant 22 mm
Panel-Mount Key Switches

Solid State DIN-Rail Mount
Multifunction Interface Timer Relays

Solid State DIN-Rail Mount
Multifunction Timer Relays