Ignition Switches | McMaster-Carr

	Wire Connection Type Wire Connection Type


Screw Terminals	Solder

Wire Leads	Quick- Disconnect Terminals

	Number of Positions Number of Positions

	Switching Voltage Switching Voltage

	Number of Terminals Number of Terminals

	Switch Action Switch Action

Stays Switched
(Maintained)

Springs Back (Momentary)

	Key Removal Position Key Removal Position

Center

Right

Left

	Keying Keying

Keyed Alike

Keyed Differently

Master Keyed

	Number of Circuits Controlled Number of Circuits Controlled

	Maximum Voltage Maximum Voltage

	For Panel Cutout Diameter For Panel Cutout Diameter

15/32"

3/4"

0.88"

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

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

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

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

2 Off (Normally Open)

	Switching Current Switching Current

10A

20A

	Industry Designation Industry Designation

	Mounting Location Mounting Location

Panel

Outlet Box

	Diameter Diameter

9/16"

7/8"

	For Maximum Panel Thickness For Maximum Panel Thickness

	Specifications Met Specifications Met

CSA

UL 94

	Depth Behind Panel Depth Behind Panel

	Environment Environment

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

RoHS Compliant

RoHS Compliant with
Exemptions

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

DFARS Specialty Metals
COTS-Exempt

	Key Number Key Number

	Environmental Rating Environmental Rating

39 Products

Choosing an Electrical Switch

With Screw Terminals

With Solder Lugs

With Wire Leads

Prevent accidental activation and limit access—these switches require a key to turn circuits on or off.

Keyed alike switches all open with the same key.

Keyed differently switches each open with a unique key.

Keyed differently/master keyed switches are keyed differently but can be used with a master key (sold separately).

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

Switches													Replacement Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Key Removal Position		Each		Each
2 Position with Metal Base
Keyed Alike with Screw Terminals
1	1 Off (Normally Open)	Springs Back (Momentary)	2	SPST-NO	6 A @ 120 V AC	240V AC	7/8"	1 3/4"	2	Center	0000000	000000	0000000	00000
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	6 A @ 120 V AC	240V AC	7/8"	1 1/2"	2	Center	0000000	00000	0000000	0000
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	6 A @ 120 V AC	240V AC	7/8"	1 1/2"	2	Center, Right	0000000	00000	0000000	0000
Keyed Alike with Solder Lugs
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	3	SPDT	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center	0000000	00000	000000	0000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	3	SPDT	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center, Right	0000000	00000	000000	0000
2	2 Off (Normally Open) or 2 On (Normally Closed)	Stays Switched (Maintained)	6	DPDT	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center	0000000	00000	000000	0000
2	2 Off (Normally Open) or 2 On (Normally Closed)	Stays Switched (Maintained)	6	DPDT	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center, Right	0000000	00000	000000	0000
Keyed Alike with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	0000000	00000	0000000	0000
Keyed Differently with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	0000000	00000	0000000	0000

Switches													Master Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Key Removal Position		Each		Each
2 Position with Metal Base
Keyed Differently/Master Keyed with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	0000000	000000	0000000	00000

3 Position with Metal Base
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Key Removal Position		Each
Keyed Alike with Solder Lugs
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	3	SPST-NO	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Left, Center, Right	0000000	000000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	4	SPST-NO	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center	0000000	00000
2	2 Off (Normally Open) or 2 On (Normally Closed)	Stays Switched (Maintained)	8	DPDT	4 A @ 125 V AC/24 V DC	28V DC 125V AC	7/8"	1 1/16"	2	Center	0000000	00000

Washdown 3/4" Panel-Mount Key Switches

With Screw Terminals

With Solder Lugs

Replacement Key

Rated NEMA 4, these switches are protected from washdowns. They require a key to turn circuits on or off, limiting access to sensitive equipment.

Keyed alike switches all open with the same key.

Keyed differently switches each open with a unique key.

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

Key Switches
										Key				Replacement Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Removal Position	Environmental Rating		Each		Each
2 Position with Metal Base
Keyed Alike with Screw Terminals
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	10 A @ 300 V AC/24 V DC	24V DC 300V AC	7/8"	1 7/8"	2	Center, Right	NEMA 4, IP66	0000000	000000	000000	00000
Keyed Alike with Solder Lugs
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	3	SPDT	4 A @ 125 V AC/28 V DC	28V DC 125V AC	7/8"	1 1/4"	2	Center, Right	NEMA 4, IP66	0000000	00000	000000	0000
Keyed Differently with Screw Terminals
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	10 A @ 300 V AC/24 V DC	24V DC 300V AC	7/8"	1 7/8"	2	Center, Right	NEMA 4, IP66	0000000	00000	000000	00
Keyed Differently with Solder Lugs
1	1 Off (Normally Open) or 1 On (Normally Closed)	Stays Switched (Maintained)	3	SPDT	4 A @ 125 V AC/28 V DC	28V DC 125V AC	7/8"	1 1/4"	2	Center, Right	NEMA 4, IP66	0000000	00000	000000	00

High-Security 3/4" Panel-Mount Key Switches

With a round key that is difficult to duplicate, these switches provide a higher degree of security than standard key switches.

Keyed alike switches all open with the same key.

Keyed differently switches each open with a unique key.

Keyed differently/master keyed switches are keyed differently but can be used with a master key (sold separately).

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

Switches
									Wire Leads			Key			Replacement Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of	Lg.	No. of Keys Included	Removal Position		Each		Each
2 Position with Metal Base
Keyed Alike with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	0000000	000000	0000000	000000
Keyed Differently with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	0000000	00000	0000000	0000
Keyed Differently/Master Keyed with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	0000000	00000	000000	00

Master Key

0000000

Each

00000

Miniature 15/32" Panel-Mount Key Switches

With Quick-Disconnect Terminals

With Wire Leads

Maximize space in a panel with these miniature switches. They require a key to turn circuits on or off, limiting access to sensitive equipment. All are keyed alike, so they open with the same key.

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

										Wire Leads
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	Quick-Disconnect Tab Width	No. of	Lg.	No. of Keys Included	Key Removal Position		Each
2 Position with Metal Base
Keyed Alike with Quick-Disconnect Terminals
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	4 A @ 125 V AC/24 V DC	28V DC 250V AC	9/16"	1 5/16"	0.11"	__	__	2	Center	00000000	000000
Keyed Alike with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	4 A @ 125 V AC/24 V DC	28V DC 250V AC	9/16"	1 5/16"	__	2	6"	2	Center	00000000	00000

High-Amp Outlet-Box-Mount Key Switches

Able to withstand high currents, these switches can be used with motors and pumps. They require a key to turn circuits on or off, limiting access to sensitive equipment. All are keyed alike, so they open with the same key.

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

											Key
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Horsepower @ Switching Voltage	Dia.	No. of Keys Included	Keying	Removal Position		Each
2 Position with Metal Base
Keyed Alike with Screw Terminals
2	2 Off (Normally Open)	Stays Switched (Maintained)	4	DPST-NO	20 A @ 120 V AC	277V AC	1 hp @ 120 V AC	7/8"	2	Keyed Alike	Center	000000	0000000

Replacement Keys (Pkg. of 2)	000000	Pkg.	000000
Wall Plate	0000000	Each	00000