Rotary Switches | McMaster-Carr

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49 Products

Choosing an Electrical Switch

For 1/4" Panel Cutout Dia.

For 13/32" Panel Cutout Dia.

Control multiple devices with one switch. Turn the shaft to change switch positions. Each position closes a set of contacts per circuit, so you can select between multiple devices on one or more circuits.

Switches for 13/32" panel cutout diameter require a knob.

For technical drawings and 3-D models, click on a part number.

						Shaft
No. of Circuits Controlled	Switch Action	No. of Positions	No. of Terminals	Dp. Behind Panel	O'all Dia.	Lg.	Dia.			Each
Nickel-Plated Brass with Black Plastic Knob
With Solder Pin Terminals for 1/4" Panel Cutout Dia.
1	Stays Switched (Maintained)	8	9	1 1/16"	9/16"	13/16"	1/8"	2 A @ 125 V AC, 1 A @ 30 V DC	0000000	000000
2	Stays Switched (Maintained)	4	10	1 1/16"	9/16"	13/16"	1/8"	2 A @ 125 V AC, 1 A @ 30 V DC	0000000	00000
With Solder Turret Terminals for 1/4" Panel Cutout Dia.
1	Stays Switched (Maintained)	6	7	1"	9/16"	13/16"	1/8"	3 A @ 125 V AC, 2 A @ 30 V DC	0000000	00000
Plastic
With Solder Lugs for 13/32" Panel Cutout Dia.
1	Stays Switched (Maintained)	12	13	13/16"	1"	1 1/2"	1/4"	2.5 A @ 125 V AC, 0.35 A @ 125 V DC	00000000	00000
2	Stays Switched (Maintained)	6	14	13/16"	1"	1 1/2"	1/4"	2.5 A @ 125 V AC, 0.35 A @ 125 V DC	00000000	00000
3	Stays Switched (Maintained)	4	15	13/16"	1"	1 1/2"	1/4"	2.5 A @ 125 V AC, 0.35 A @ 125 V DC	00000000	00000
4	Stays Switched (Maintained)	3	16	13/16"	1"	1 1/2"	1/4"	2.5 A @ 125 V AC, 0.35 A @ 125 V DC	00000000	00000

22 mm Panel-Mount Knob Switches

Set these switches to either spring back (momentary) or stay switched (maintained). They're rated NEMA 4X, 13, and IP66.

Replace contact blocks (sold separately) or add additional contact blocks to control more circuits.

For technical drawings and 3-D models, click on a part number.

With Screw Terminals
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	For Max. No. of Contact Blocks	Environmental Rating	Specifications Met		Each
2 Position
2	2 Off (Normally Open)	Springs Back (Momentary), Stays Switched (Maintained)	4	DPST-NO	6 A @ 120 V AC, 3 A @ 24 V DC	250V DC 500V AC	13/16"	1 3/4"	4	NEMA 4X, NEMA 13, IP66	UL Listed, CSA Certified, CE Marked, CCC Marked	0000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Springs Back (Momentary), Stays Switched (Maintained)	4	DPST-1NO/1NC	6 A @ 120 V AC, 3 A @ 24 V DC	250V DC 500V AC	13/16"	1 3/4"	4	NEMA 4X, NEMA 13, IP66	UL Listed, CSA Certified, CE Marked, CCC Marked	0000000	00000
3 Position
3	3 Off (Normally Open)	Springs Back (Momentary), Stays Switched (Maintained)	6	3PST-NO	6 A @ 120 V AC, 3 A @ 24 V DC	250V DC 500V AC	13/16"	1 3/4"	6	NEMA 4X, NEMA 13, IP66	UL Listed, CSA Certified, CE Marked, CCC Marked	0000000	00000
3	2 Off (Normally Open) and 1 On (Normally Closed)	Springs Back (Momentary), Stays Switched (Maintained)	6	3PST-2NO/1NC	6 A @ 120 V AC, 3 A @ 24 V DC	250V DC 500V AC	13/16"	1 3/4"	6	NEMA 4X, NEMA 13, IP66	UL Listed, CSA Certified, CE Marked, CCC Marked	0000000	00000

Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Environmental Rating	Specifications Met		Each
1	1 Off (Normally Open)	2	SPST-NO	IP20	UL Listed, UL 508, CSA Certified, CE Marked	0000000	000000
1	1 On (Normally Closed)	2	SPST-NC	IP20	UL Listed, UL 508, CSA Certified, CE Marked	0000000	00000

Battery Knob Switches

Alternate between two batteries without interrupting power. These switches are often used in marine applications.

For technical drawings and 3-D models, click on a part number.

						Mounting Holes
Actuator Material	No. of Terminals	Max. Voltage	Max. Continuous Current	Terminal Size	For Max. Wire Ga.	No. of	Dia.	Ht.	Wd.	Dp.	Environment	Environmental Rating	Specifications Met		Each
With Stud Terminals
For 3 5/8" Cutout Dia.
Plastic	3	32V DC	350 A @ 32 V DC	3/8"	4/0	4	1/4"	3 7/8"	3 7/8"	3 1/8"	Washdown	IP66	UL Listed, UL Marine Listed, CE Marked, ISO 8846, SAE J1171	00000000	000000

Light Dimmers

Rotary

Rotary with Wall Plate

Adjust the brightness of lights.

Rotary
For Bulb Type	No. of Circuits Controlled	No. of Terminals	Input Voltage	Wattage	Wire Connection Type	Choose a Color		Each
Incandescent	1	3	120V AC	600W	Wire Leads	White	0000000	00000
Rotary with Wall Plate
Incandescent	1	2	120V AC	1,500W	Wire Leads	Beige, White	0000000	000000
Incandescent	1	2	120V AC	2,000W	Wire Leads	Beige, White	0000000	000000

Potentiometers

Vary electrical flow to control speed, volume, and light intensity. The number of turns affects the resolution—the higher the number, the better the control. Also known as variable output switches or rheostats. A knob is required (not included).

Switches with ball bearings have a smoother rotation and a longer service life than other potentiometers.

Switches

						Shaft
	No. of Turns	Wattage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Environmental Rating	Choose a Max. Resistance, kilohms		Each
A	10	2 W @ 325 V AC	7/16"	1"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP65	1, 5	0000000	000000
A	10	2 W @ 447 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
A	10	2 W @ 450 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
A	5	1.5 W @ 273 V AC	7/16"	3/4"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
B	1	1 W @ 300 V AC	7/16"	7/16"	7/8"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	00000
C	10	5 W @ 1,000 V AC	7/16"	1 3/4"	1 13/16"	1/4"	1/2"	Plastic	Solder Lugs	3	IP40	1, 5, 10	0000000	000000

Black Panel Seal	000000000	Each	00000
Gray Panel Seal	00000000	Each	0000

Switches with Ball Bearings

						Shaft
	No. of Turns	Wattage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Choose a Max. Resistance, kilohms		Each
D	1	2 W @ 350 V AC	7/16"	5/8"	2"	1/4"	3/8"	Plastic	Solder Lugs	3	1, 5, 10	0000000	0000000

Black Panel Seal	000000000	Each	00000
Gray Panel Seal	00000000	Each	0000

Switches with On/Off Controls

			Switching					Shaft
	No. of Turns	Wattage	Current	Voltage	For Panel Cutout Dia.	Dp. Behind Panel	Dia.	Dia.	Lg.	Housing Material	Wire Connection Type	No. of Terminals	Environmental Rating	Choose a Max. Resistance, kilohms		Each
E	1	0.125 W @ 350 V AC	1.5A	12V DC	3/16"	1/4"	7/16"	1/8"	5/16"	Metal	Solder Lugs	5	IP40	5, 10, 20, 25	000000	000000

Digital Potentiometers

More precise than analog potentiometers, these have a three-digit display that is easy to read. Also known as variable output switches or rheostats, they vary electrical flow to control speed, volume, and light intensity.

Rotary

Knob

Wattage	No. of Digits	No. of Turns	Dia.	For Panel Cutout Dia.	Dp. Behind Panel	Housing Material	Wire Connection Type	No. of Terminals	Choose a Max. Resistance, kilohms		Each
1.5 W @ 385 V AC	3	10	1 1/4"	1"	5/8"	Plastic	Solder Lugs	3	1, 5, 10	0000000	0000000

Harsh Environment Potentiometers

Plastic

Rated NEMA 13, these potentiometers protect against debris and splashing oil and coolant. Also known as variable output switches or rheostats, they vary electrical flow to control speed, volume, and light intensity.

NEMA 4X rated potentiometers withstand weather, washdowns, and corrosion.

					Actuator
Wattage @ Voltage	Max. Voltage	For Panel Cutout Dia.	Dp. Behind Panel	No. of Turns	Dia.	Material	Wire Connection Type	Environmental Rating	Specifications Met	Choose a Max. Resistance		Each
Plastic
2 W @ 120 V AC/ 2 W @ 24 V DC	500V AC/500V DC	7/8" (22 mm)	2 1/4"	1	1 1/8"	Plastic	Screw Terminals	NEMA 4X, NEMA 13, IP65	UL Listed, C-UL Listed, CE Marked	1 kilohms, 2.5 kilohms, 5 kilohms, 10 kilohms	000000	000000

Speed-Monitoring Switches

Set to a specific speed to detect unwanted machinery slowdown that can cause damage and downtime. Applications include drive trains, power-driven components, and conveyors. Switches are UL listed for Class I, Divisions 1 and 2, Groups C and D; and Class II, Divisions 1 and 2, Groups E, F, and G. They have an explosion-proof housing and are also rated NEMA 4X for washdown and corrosion protection.

	Switching		Input			Conduit			Mounting Slot
Activation Point Range, rpm	Current, A	Voltage	Voltage	Frequency, Hz	No. of Terminals	Trade Size	Thread Type	Gender	Lg.	Wd.	No. of	Mounting Fasteners Included	Environmental Rating		Each
1 Off (Normally Open), 1 On (Normally Closed) Starting Switch Position
SPDT
5-100	5	120V AC	120V AC	60	5	1	NPT	Female	1 1/4"	0.32"	2	Yes	NEC Class I Divisions 1, 2 Groups C, D NEC Class II Divisions 1, 2 Groups E, F, G NEMA 4X	0000000	0000000

Level Switches for Dry Materials

When dry material rises to the level of the rotating paddle, these switches actuate. All are rated NEMA 4X and IP66 for protection from corrosion and washdowns.

Switches with auxiliary SPDT relay activate an alarm (not included).

For technical drawings and 3-D models, click on a part number.

Level Switches

Horizontal Side Mount

Vertical Top Mount

							Paddle
Current	Max. Pressure	Temp. Range, °F	Insertion Dp.	Switch Starting Position	Industry Designation	Paddle Speed, rpm	Lg.	Wd.	Features	Environmental Rating	Specifications Met		Each
Horizontal Side Mount—0-30 lbs. per cu. ft. Capacity
8 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	6 5/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	7"	2"	Auxiliary SPDT Relay LED Alarm Status Indicator LED Power Indicator	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	0000000
20 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	6 5/8"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	7"	2"	__	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000
Vertical Top Mount—30-70 lbs. per cu. ft. Capacity
8 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	12"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	5"	1 1/2"	Auxiliary SPDT Relay LED Alarm Status Indicator LED Power Indicator	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000
20 A @ 120 V AC	30 psi @ 70° F	-40° to 110°	12"	1 Off (Normally Open) or 1 On (Normally Closed)	SPDT	1	5"	1 1/2"	__	IP66, NEMA 4X, NEC Class I Divisions 1, 2 Groups C, D, NEC Class II Divisions 1, 2 Groups E, F, G	UL Listed C-UL Listed	00000000	000000

Replacement Paddles for Horizontal Side Mount Level Switches

Paddle Material		Each
316 Stainless Steel	00000000	000000

Replacement Motors for 20 A @ 120 V AC Level Switches

Voltage	Includes		Each
120V AC	Bracket, Washer	00000000	0000000

Flow Switches with Indicator for Water

For flow monitoring at a glance, these switches have a plastic window with a rotor indicator that spins when flow is present. They activate or deactivate equipment when the flow rate reaches your set point. All have an adjustment screw for altering the set point to suit your application. Switches are single pole, double throw (SPDT) and can be installed to turn one circuit from "off" to "on" (normally open) or from "on" to "off" (normally closed).

Switches with a polypropylene body are lighter than sights with a metal body.

Switches with a 316 stainless steel body are more corrosion resistant than switches with a brass body.

For technical drawings and 3-D models, click on a part number.

Polypropylene Plastic Body
Pipe Size	Thread Type	Gender	Set Point, gpm	Max. Pressure	Temp. Range, °F	Voltage	Current	End-to-End Lg.		Each
1/4	NPT	Female	0.1 to 5	100 psi @ 70° F	33° to 180°	120V AC	0.3 A @ 120 V AC	3 1/16"	0000000	0000000
1/2	NPT	Female	1.5 to 20	100 psi @ 70° F	33° to 180°	120V AC	0.3 A @ 120 V AC	3 1/16"	0000000	000000
Brass Body
1/4	NPT	Female	0.1 to 5	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
1/2	NPT	Female	1.5 to 20	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
3/4	NPT	Female	5 to 30	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
1	NPT	Female	8 to 60	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
316 Stainless Steel Body
1/2	NPT	Female	1.5 to 20	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3"	0000000	000000
3/4	NPT	Female	5 to 30	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000
1	NPT	Female	8 to 60	200 psi @ 70° F	33° to 212°	120V AC	0.3 A @ 120 V AC	3 15/16"	0000000	000000

Speaker Volume Controls

Control with Volume Knob

Control with Key Lock

Wire one of these controls between your speakers and amplifier to adjust the volume.

The control with a key lock prevents tampering.

Power, W	No. of Sound Levels	Voltage	Ht.	Wd.	Dp.	Mounting Plate Material	Fasteners Included	Features	Specifications Met		Each
25	10	25V AC, 70V AC, 100V AC	4 1/2"	2 3/4"	2 3/4"	Stainless Steel	Yes	Volume Knob	C-ETL Listed, ETL Listed	00000000	000000
50	10	25V AC, 70V AC, 100V AC	4 1/2"	2 3/4"	2 3/4"	Stainless Steel	Yes	Volume Knob	C-ETL Listed, ETL Listed	00000000	00000
100	10	25V AC, 70V AC, 100V AC	4 1/2"	2 3/4"	2"	Stainless Steel	Yes	Key Lock	__	00000000	000000
100	10	25V AC, 70V AC, 100V AC	4 1/2"	2 3/4"	3 1/8"	Stainless Steel	Yes	Volume Knob	C-ETL Listed, ETL Listed	00000000	00000