NEMA 3R Switches | McMaster-Carr

Filter by

System of Measurement

Switching Voltage

Panel Cutout Diameter

Switching Current

Reset Type

Enclosure Rating

Actuator Style

Push-Button Style

Number of Circuits Controlled

Switch Starting Position

Electrical Phase

Switch Designation

Switch Action

Illumination

Certification

Number of Terminals

Actuator Color

DFARS Compliance

Actuator Base Material

RoHS Compliance

Maximum Temperature

Wire Connection

Switch Type

Forward

How can we improve?

80 Products

Choosing an Electrical Switch

About Motor Switches and Starters

30 mm Emergency Stop Panel-Mount Push-Button Switches

Immediately cut power with a single push. These switches are rated for protection from low-pressure streams of water and oil/coolant spraying. They have positive force contacts that will open a circuit when actuated even if a spring fails or the contacts stick. Switches include enough contact blocks to control the number of circuits listed.

Turn twist switches back on by twisting the button and pull switches by pulling it. Add an optional lockout on either kind to cover the button and prevent changes its position.

Note: Illuminated switches include a bulb. If wiring the switch and the bulb to the same circuit, the circuit voltage must not exceed bulb voltage.

Additional contact blocks (sold separately) can be added to control more circuits, or to replace the included contact block.

Pull Reset

Twist Reset

Illuminated Pull Reset

Metal Base with Screw Terminals
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Actuator Color	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	For Max. No. of Contact Blocks	Choose a Bulb Voltage		Each
Pull Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
Twist Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
Metal Base with Screw Terminals—Illuminated
Pull Reset
1	1 Off (Normally Open)	Stays Switched (Maintained)	4	SPST-NO	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	2 1/16"	4	24V AC/24V DC, 120V AC/120V DC	0000000	000000
1	1 On (Normally Closed)	Stays Switched (Maintained)	4	SPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	2 1/16"	4	240V AC/240V DC	00000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	6	DPST-1NO/1NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	2 15/16"	4	24V AC/24V DC, 120V AC/120V DC, 240V AC/240V DC	0000000	000000
2	2 On (Normally Closed)	Stays Switched (Maintained)	6	DPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	2 15/16"	4	24V AC/24V DC, 120V AC/120V DC, 240V AC/240V DC	0000000	000000
Plastic Base with Screw Terminals
Pull Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	00000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
Twist Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	00000
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 5 A @ 24 V DC	250V DC 600V AC	1 1/2"	1 1/2"	8	__	00000000	000000

Contact Blocks

For 1 1/2" Diameter Switches
No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation		Each
1	1 Off (Normally Open)	2	SPST-NO	00000000	000000
1	1 On (Normally Closed)	2	SPST-NC	00000000	00000

Replacement Actuators for 1 1/2" Diameter Switches

					Pull Reset		Twist Reset
Actuator Clarity	Actuator Color	Bulb Type	Bulb Color	Choose a Bulb Voltage		Each		Each
Metal Base—Not Illuminated
Opaque	Red	__	__	__	00000000	000000	00000000	000000
Metal Base—Illuminated
Clear	Red	LED	Red	24V AC/24V DC, 120V AC/120V DC, 240V AC/240V DC	0000000	000000	000000	00
Plastic Base—Not Illuminated
Opaque	Red	__	__	__	00000000	00000	00000000	00000

Replacement Bulbs for Pull Reset Switches

Replacement Bulb

	Bulb
Voltage	Shape Number	Diameter	Overall Length	Bulb Material	Color	Light Technology	Rated Life, hrs.		Each
For 1 1/2" Diameter Switches
For Switches with 24V AC/24V DC Bulb
24V AC, 24V DC	T3 1/4	3/8"	1 1/8"	Plastic	Red	LED	100,000	00000000	000000
For Switches with 120V AC/120V DC Bulb
130V AC, 130V DC	T3 1/4	3/8"	1 1/8"	Plastic	Red	LED	100,000	00000000	00000

Optional Lockouts for 1/2" Diameter Switches

For Maximum Padlock Shackle Diameter		Each
1/4"	00000000	000000

Outdoor High-Current Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing. They control equipment with high currents, such as landscape lighting, pumps, and heaters. Program them to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times.

24-hour switches repeat the same program daily.

Seven-day switches can perform a different program each day of the week.

Switches with a day skipper can be programmed to skip operation for one to six days.

Additional trippers (sold separately) are sold in pairs that include one “on” tripper and one “off” tripper.

Switches															Additional Trippers
No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage	Maximum On/Off Cycles	Minimum Set Time	Tripper Type	No. of Trippers	Housing Material	Industry Designation	Ht.	Wd.	Dp.	Wire Connection Type		Each	Pkg. Qty.		Pkg.
24-Hour Timing Cycle
1	40 A @ 240 V AC	120V AC	12 per Day	1 hrs.	Removable	2	Steel	SPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminals	0000000	0000000	1	0000000	00000
2	40 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	48 per Day	15 min.	Captive	96	Polycarbonate Plastic	DPDT	8 7/8"	6 5/8"	3"	Screw Terminals	0000000	000000	__	000000	00
2	40 A @ 240 V AC	120V AC	12 per Day	1 hrs.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminals	0000000	000000	1	0000000	0000
2	40 A @ 240 V AC	208V AC/240V AC/277V AC	12 per Day	1 hrs.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminals	0000000	000000	1	0000000	0000
24-Hour Timing Cycle with Day Skipper and Three Skip Screws
2	40 A @ 240 V AC	120V AC	10 per Day	1 hrs.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminals	0000000	000000	1	0000000	0000
2	40 A @ 240 V AC	208V AC/240V AC/277V AC	10 per Day	1 hrs.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminals	0000000	000000	1	0000000	0000
7-Day Timing Cycle
2	40 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	6 per Day	2 hrs.	Captive	96	Polycarbonate Plastic	DPDT	8 7/8"	6 5/8"	3"	Screw Terminals	00000000	000000	__	000000	00
4	40 A @ 240 V AC	120V AC	3 per Day	3.5 hrs.	Removable	14	Steel	4PST	12 1/2"	8 1/4"	4"	Screw Terminals	00000000	000000	7	00000000	00000

Additional Day-Skip Screws (Pkg. of 3)

0000000

Pkg.

00000

Outdoor Time and Day Activated Switches

24-Hour Timing Cycle

Designed to work with landscape lighting and filter pumps, these switches turn equipment on and off at a set time and day. They control two devices at once, and have three-prong outlets to plug devices directly into the switch. All have an override to bypass the programmed on/off settings.

24-hour switches repeat the same program daily. Position trippers around the clock dial to set on and off times.

Switches with light sensor control allow one device to be controlled by the presence or absence of light.

NEMA 3R rated switches are protected against falling liquids and light splashing.

													Mounting
Maximum On/Off Cycles	Minimum Set Time	Timing Adjustment Style	Tripper Type	No. of Trippers	Switching Current @ Voltage	No. of Outlets	Features	Ht.	Wd.	Dp.	Plug Type	Cord Lg., ft.	Fasteners Included	No. of Holes	Hole Dia.		Each
24-Hour Timing Cycle—NEMA 3R
12 per Day	30 min.	Trippers	Removable	4	15 A @ 120 V AC	2	Light Sensor Control	9 3/8"	5 1/2"	3 3/8"	Three Prong	2	No	4	1/4"	0000000	0000000

Additional Trippers (Pkg. of 2 Pair)

0000000

Pkg.

00000

Outdoor Set-to-the-Minute High-Current Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing. More precise than other time and day switches, they program on/off times for equipment down to the exact minute. They control equipment with high currents, such as landscape lighting, pumps, and heaters. A backup battery maintains the program during a power outage.

24-hour switches repeat the same program daily.

Seven-day switches can perform a different program each day of the week.

Seven-day/365-day switches can perform a different program each day of the week or year, and compensate for leap year and daylight savings time. Override regular programming for up to 99 holidays for any length of time. They can also be used to activate equipment such as bells and signals for just a few seconds.

Switches with astronomical timing can be set to turn lights on and off based on sunrise and sunset.

Switches with a day skipper can be programmed to skip operation for one to six days.

											Mounting
No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage	Maximum On/Off Cycles	Minimum Set Time	Timing Adjustment Style	Housing Material	Industry Designation	Ht.	Wd.	Dp.	Fasteners Included	Hole Dia.	Wire Connection Type		Each
24-Hour Timing Cycle
With Battery Backup, Lockout
1	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	20 per Day	1 min.	Push Button	Polycarbonate Plastic	SPST	8 1/4"	5"	3"	No	0.16"	Screw Terminals	0000000	0000000
2	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	20 per Day	1 min.	Push Button	Polycarbonate Plastic	DPST	8 1/4"	5"	3"	No	0.16"	Screw Terminals	0000000	000000
7-Day Timing Cycle
With Battery Backup, Lockout, Day Skipper
2	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	20 per Day	1 min.	Push Button	Polycarbonate Plastic	DPST	8 1/4"	5"	3"	No	0.16"	Screw Terminals	0000000	000000
With Battery Backup, Lockout, Day Skipper, Astronomical Timing
1	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	20 per Day	1 min.	Push Button	Polycarbonate Plastic	SPDT	8 1/4"	5"	3"	No	0.16"	Screw Terminals	0000000	000000
7-Day/365-Day Timing Cycle
With Battery Backup, Lockout, Astronomical Timing
1	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	4,000 per Year	1 min.	Push Button	Steel	SPDT	8 5/8"	5 3/4"	3 5/8"	No	0.19"	Screw Terminals	00000000	000000
2	30 A @ 240 V AC	120V AC/208V AC/240V AC/277V AC	4,000 per Year	1 min.	Push Button	Steel	SPDT	8 5/8"	5 3/4"	3 5/8"	No	0.19"	Screw Terminals	00000000	000000

Raintight Enclosed Motor Switches

These switches are rated NEMA 3R for protection from falling water and light splashing. Use them to turn motors on and off, or with other circuits such as lighting and electric heat circuits. They do not provide overload protection.

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

				Switching
No. of Circuits Controlled	Electrical Phase (hp)	Switch Starting Position	Industry Designation	Current, A	Voltage	Ht.	Wd.	Wire Connection Type	Environmental Rating	Specifications Met		Each
Stays Switched (Maintained)
2	Single (3 hp @ 240 V AC)	2 Off (Normally Open)	DPST-NO	30	600V AC	5.8"	4.5"	Screw Terminals	NEMA 3R	CSA Certified, UL Listed, UL 94 V-2	0000000	000000
3	Three (7 1/2 hp @ 240 V AC)	3 Off (Normally Open)	3PST-NO	30	600V AC	5.8"	4.5"	Screw Terminals	NEMA 3R	CSA Certified, UL Listed, UL 94 V-2	0000000	000000

Outdoor Durable Disconnect Switches

A raintight NEMA 3R rated enclosure protects these switches from falling liquids and light splashing. The enclosure is steel, so it withstands tougher conditions than plastic enclosures. All have quick-make/quick-break action to eliminate arcing and prolong switch life. They have a lockout to secure in the off position using a padlock (not included).

Use switches with a fuse holder where overload protection is needed. When used with UL Class RK1, RK5, or T fuses, they require rejection-style fuse clips. Note: Horsepower ratings are based on time-delay fuses installed.

Switches with safety interlock keep the door closed when the switch is on, and prevent the switch from turning on when the door is open.

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

Switches
Switching											Rejection-Style Fuse Clips for RK1 and RK5 Fuse Class
Current, A	Voltage	Switch Action	Industry Designation	Electrical Phase (hp)	For No. of Wires	For Fuse Class	Ht.	Wd.		Each		Each
Gray Enamel-Coated Steel with Black/Red Actuator
60	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Single (30 hp @ 240 V AC) Three (60 hp @ 600 V AC)	3	__	18 1/2"	9 1/16"	0000000	0000000	000000	00
60	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (50 hp @ 600 V AC)	4	RK1, RK5, J, H	18 1/2"	9 1/16"	0000000	000000	00000000	000000
100	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (75 hp @ 600 V AC)	4	RK1, RK5, J, H	22 1/8"	9 1/16"	0000000	00000000	00000000	00000
200	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (150 hp @ 600 V AC)	4	RK1, RK5, J, H	29"	17"	0000000	00000000	00000000	00000
3 Circuits with Lockout, Safety Interlock
30	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Single (10 hp @ 240 V AC) Three (30 hp @ 600 V AC)	3	__	15"	7 3/4"	0000000	000000	000000	00
3 Circuits with Lockout, Safety Interlock, Fuse Holder
30	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (20 hp @ 600 V AC)	3	RK1, RK5, J, H	15"	7 3/4"	0000000	000000	00000000	00000
30	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (20 hp @ 600 V AC)	4	RK1, RK5, J, H	15"	7 3/4"	0000000	000000	00000000	00000
60	600V AC/ 600V DC	Stays Switched (Maintained)	3PST	Three (50 hp @ 600 V AC)	3	RK1, RK5, J, H	17 1/2"	10 1/2"	0000000	000000	00000000	00000
Gray Powder-Coated Steel with Red Actuator
2 Circuits with Lockout, Fuse Holder
30	240V AC/ 250V DC	Stays Switched (Maintained)	DPST	Single (3 hp @ 240 V AC)	3	RK1, RK5, K5, H	8 9/16"	5 7/16"	0000000	00000	00000000	000000
60	240V AC/ 250V DC	Stays Switched (Maintained)	DPST	Single (10 hp @ 240 V AC)	3	RK1, RK5, K5, H	10 1/16"	6 7/16"	0000000	000000	00000000	00000
2 Circuits with Lockout, Safety Interlock, Fuse Holder
100	240V AC/ 250V DC	Stays Switched (Maintained)	DPST	Single (15 hp @ 240 V AC)	3	RK1, RK5, K5, T, H	23 1/8"	12"	0000000	000000	00000000	00000
3 Circuits with Lockout
30	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Three (7 1/2 hp @ 240 V AC)	3	__	6 3/8"	4 9/16"	0000000	000000	000000	00
60	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Three (15 hp @ 240 V AC)	3	__	8 9/16"	5 7/16"	0000000	000000	000000	00
3 Circuits with Lockout, Fuse Holder
30	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Single (3 hp @ 240 V AC) Three (7 1/2 hp @ 240 V AC)	4	RK1, RK5, K5, H	8 9/16"	5 7/16"	0000000	000000	00000000	000000
60	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Single (10 hp @ 240 V AC) Three (15 hp @ 240 V AC)	4	RK1, RK5, K5, H	10 1/16"	6 7/16"	0000000	000000	00000000	00000
3 Circuits with Lockout, Safety Interlock
100	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Three (30 hp @ 240 V AC)	3	__	23 1/8"	12"	0000000	000000	000000	00
3 Circuits with Lockout, Safety Interlock, Fuse Holder
100	240V AC/ 250V DC	Stays Switched (Maintained)	3PST	Single (15 hp @ 240 V AC) Three (30 hp @ 240 V AC)	4	RK1, RK5, K5, T, H	23 1/8"	12"	0000000	000000	00000000	00000

Rejection-Style Fuse Clip for T Fuse Class

00000000

Each

000000

Enclosed Disconnect Switches

Cut power and keep it isolated to prevent equipment from starting up during inspection and maintenance. These switches are housed in a protective enclosure.

Switches with lockout secure in the off position with a padlock with a maximum shackle diameter of 5/16” (not included).

Use additional power poles to control more than three circuits. Add neutral poles to open and close the neutral leg of a three phase system.

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

Two-Circuit Switch with Lockout

Switching						Plastic Housing with Red Actuator
Current, A	Voltage	Industry Designation	Ht.	Wd.	Environmental Rating		Each
Stays Switched (Maintained)
2 Circuits with Lockout
50	800V DC	DPST	12 5/8"	8 11/16"	IP65, NEMA 3R	0000000	0000000
63	650V DC	DPST	12 5/8"	8 11/16"	IP65, NEMA 3R	0000000	000000

"Main Switch" Label with Adhesive Back—13/16" Ht. × 3 3/16" Wd.

0000000

Each

00000

Manual Transfer Switches

NEMA 3R

If there’s a power outage, flip the toggle for each circuit on these switches to backup power. Each circuit can also be turned off completely. To prevent injury and damage to your generators, they are open transition, meaning the contacts disconnect from one power source before connecting to another. This is also known as break-before-make switching.

Use them with a portable generator.

NEMA 3R switches can be used outdoors since they seal out rain, snow, and sleet.

Switches with a key lock prevent unauthorized changes to the switch.

					Housing
Max. Power	Switching Current (No. of Switches)	Circuit Breaker Breakthrough Current	Electrical Phase	Housing Material	Ht.	Wd.	Dp.	Generator Connection Style	Features	Specifications Met		Each
NEMA 3R
6 Circuits Total
7,500W	20 A @ 240 V AC (1 DPDT) 15 A @ 120 V AC (4 SPDT)	10,000A	Single	Powder-Coated Steel	13"	8"	5"	NEMA L14-30	Key Lock	UL Listed, UL 1008, NEC Article 702	0000000	0000000
12,500W	20 A @ 240 V AC (1 DPDT) 15 A @ 120 V AC (4 SPDT)	10,000A	Single	Powder-Coated Steel	13"	8"	5"	CS6375	Key Lock	UL Listed, UL 1008, NEC Article 702	0000000	000000
10 Circuits Total
7,500W	20 A @ 240 V AC (1 DPDT) 20 A @ 120 VAC (2 SPDT) 15 A @ 120 V AC (6 SPDT)	10,000A	Single	Powder-Coated Steel	13"	12"	5"	NEMA L14-30	Key Lock	UL Listed, UL 1008, NEC Article 702	0000000	000000
12,500W	20 A @ 240 V AC (1 DPDT) 20 A @ 120 VAC (2 SPDT) 15 A @ 120 V AC (6 SPDT)	10,000A	Single	Powder-Coated Steel	13"	12"	5"	CS6375	Key Lock	UL Listed, UL 1008, NEC Article 702	0000000	000000

Airflow-Actuated HVAC Switches

Use this switch to sense changes in airflow velocity in duct. The paddle extends into the duct and actuates the switch when airflow reaches the setpoint. Switch is rated NEMA 3R for protection from dirt, falling liquids, and light splashing.

							Paddle
Setpoint, fpm	Temperature Range, °F	Current	Electrical Connection Type	Switch Type	For Conduit Trade Size	Knockout Dia.	Material	Ht.	Wd.	For Use Outdoors	Environmental Rating	Specifications Met		Each
Paddle Sensor
350-500	32° to 104°	10 A @ 240 V AC 16 A @ 120 V AC	Screw Terminal	SPDT	1/2	7/8"	Stainless Steel	6 7/8"	3 1/8"	Yes	IP43, NEMA 3R	UL Listed, C-UL Listed, CE Marked	0000000	0000000