Knob Switches | McMaster-Carr

	Actuator Style Actuator Style


Lever	Rotary

Key	Push Button

	Number of Positions Number of Positions

	Switching Voltage Switching Voltage

	Switch Action Switch Action

Stays Switched (Maintained)

Springs Back (Momentary)

	For Panel Cutout Diameter For Panel Cutout Diameter

	Number of Terminals Number of Terminals

	Illumination Illumination

Not Illuminated

Illuminated

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 Off (Normally Open) and
1 On (Normally Closed)

2 Off (Normally Open)

1 On (Normally Closed)

2 Off (Normally Open) and
1 On (Normally Closed)

2 Off (Normally Open) and
2 On (Normally Closed)

2 On (Normally Closed)

3 Off (Normally Open)

	Actuator Color Actuator Color

	Black		Green
	Gray		Red
	White		Yellow

	Number of Circuits Controlled Number of Circuits Controlled

	Environment Environment

High-
Pressure
Washdown

Hazardous

	Wire Connection Type Wire Connection Type

Screw Terminals

Solder

Stud Terminals

Quick-Disconnect Terminals

Solder Pin Terminals

Solder Turret Terminals

	Maximum Voltage Maximum Voltage

	Switching Current Switching Current

	Environmental Rating Environmental Rating

NEC Class I Division 2
Groups A, B, C, D

NEC Class I Divisions
1, 2 Groups C, D

NEC Class II Divisions
1, 2 Groups E, F, G

NEC Class III
Divisions 1, 2

	Specifications Met Specifications Met

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Industry Designation Industry Designation

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Actuator Base Material Actuator Base Material

Plastic

Metal

	Depth Behind Panel Depth Behind Panel

	Diameter Diameter

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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158 Products

Choosing an Electrical Switch

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.

Metal 22 mm Panel-Mount Lever Switches

Switches are rated NEMA 4, 13, and IP66.

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.

Plastic 30 mm Panel-Mount Lever Switches

These plastic switches are rated NEMA 4X, 13, and IP65 for protection from corrosion, washdowns, and oil/coolant spraying. Install them in 30 mm dia. cutouts.

16 mm Panel-Mount Lever Switches

Install in 16 mm dia. cutouts.

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

Rated NEMA 3S, 4X and 13, these switches are protected from corrosion, washdowns, and oil/coolant spraying.

Rotary Switches

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

Battery Knob Switches

Alternate between two batteries without interrupting power.

22 mm Panel-Mount Knob Switches

Turn these switches by hand.

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

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

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

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

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 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.

Potentiometers

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

Digital Potentiometers

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

Harsh Environment Potentiometers

Rated NEMA 4X and 13, these potentiometers are protected from debris, washdowns, and oil/coolant spraying.

Indicating Knobs

Control devices with round or D-shaped shafts and 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.

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Choosing an Electrical Switch

Manual Switches

Plastic 22 mm Panel-Mount Lever Switches

Metal 22 mm Panel-Mount Lever Switches

Metal 30 mm Panel-Mount Lever Switches

Plastic 30 mm Panel-Mount Lever Switches

16 mm Panel-Mount Lever Switches

Hazardous Location Enclosed Lever Switches

Plastic Enclosed Lever Switches

Rotary Switches

Battery Knob Switches

22 mm Panel-Mount Knob Switches

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

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

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

22 mm Panel-Mount Key Switches

Potentiometers

Potentiometers

Digital Potentiometers

Harsh Environment Potentiometers

Indicating Knobs

Indicating Knobs

Turn-Counting Indicating Knobs