Ignition Switches | McMaster-Carr

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46 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. All fit into a standard panel cutout.

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)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	00000000	00000	00000000	0000
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)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	00000000	00000	00000000	0000
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)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	00000000	000000	00000000	00000
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

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

Rated NEMA 4 or IP66, these switches are protected from washdowns. They require a key to turn circuits on or off, limiting access to sensitive equipment. All fit into a standard panel cutout.

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														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	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
2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	20 A @ 240 V AC	690V AC	7/8"	2 5/8"	2	Center, Right	IP66	00000000	00000	000000	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/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	00000
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