Key-to-Reset Switches | McMaster-Carr

	Reset Type Reset Type

Key

Pull

	Switching Voltage Switching Voltage

120V AC

125V AC

24V DC

	For Panel Cutout Diameter For Panel Cutout Diameter

	Switch Starting Position Switch Starting Position

1 On (Normally Closed)

2 On (Normally Closed)

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

	Environment Environment

High-
Pressure
Washdown

	Specifications Met Specifications Met

	Environmental Rating Environmental Rating

	Switching Current Switching Current

2.5A

	Illumination Illumination

Not Illuminated

Illuminated

	Push-Button Shape Push-Button Shape

Round

Triangular

	Wire Connection Type Wire Connection Type


Screw Terminals	Screw-Clamp Terminals

	Diameter Diameter

	Industry Designation Industry Designation

SPST-NC

DPST-NC

DPST-1NO/1NC

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

DFARS Specialty Metals
COTS-Exempt

	Number of Terminals Number of Terminals

	Maximum Voltage Maximum Voltage

250V AC

600V AC

600V DC

	Number of Circuits Controlled Number of Circuits Controlled

	Message Color Message Color

White

Black

Red

	Message Message

Clockwise Arrows

Stop

Emergency Stop

	Actuator Base Material Actuator Base Material

Metal

Plastic

	For Maximum Number of Contact Blocks For Maximum Number of Contact Blocks

	Terminal Numbering Terminal Numbering

	Depth Behind Panel Depth Behind Panel

1 11/16"

1 13/16"

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33 Products

Choosing an Electrical Switch

Metal 22 mm Emergency Stop Panel-Mount Push-Button Switches

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

Switches

Key Reset

Key Reset 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		Each
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1 13/16"	6	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, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1 13/16"	6	00000000	00000
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1 13/16"	6	00000000	00000

Emergency Stop Label for Switch without Lockout

0000000

Each

00000

Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Environmental Rating		Each
1	1 On (Normally Closed)	2	SPST-NC	IP20	00000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	4	DPST-1NO/1NC	__	0000000	00000
2	2 On (Normally Closed)	4	DPST-NC	IP20	000000	00000

Plastic 22 mm Emergency Stop Panel-Mount Push-Button Switches

Immediately cut power with a single push. These switches meet EN 418 for compliance with European machine directives for emergency stop applications. All have positive force contacts that will open a circuit when actuated even if a spring fails or the contacts stick. They're rated IP66, IP69K, NEMA 3S, NEMA 4X, and NEMA 13, and are UL and C-UL Recognized Components. Switches include enough contact blocks to control the number of circuits listed. Contact blocks are rated IP20 and are UL and C-UL Listed.

Key reset switches are keyed alike, so if you buy multiple switches they will all reset with the same key.

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

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

Key Reset

Switches															Replacement Actuators
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	No. of Keys Included	Manufacturer		Each		Each
With Screw Terminals
Key Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 1/4"	1 13/16"	6	2	BACO Controls	0000000	000000	000000	00
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1 13/16"	6	2	BACO Controls	0000000	00000	0000000	000000
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 1/4"	1 13/16"	6	2	BACO Controls	0000000	00000	000000	00
2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	Red	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1 13/16"	6	2	BACO Controls	0000000	00000	0000000	00000

Emergency Stop Label

0000000

Each

00000

Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation		Each
1	1 On (Normally Closed)	2	SPST-NC	000000	00000

16 mm Emergency Stop Panel-Mount Push-Button Switches

Key Reset

Immediately cut power with a single push. These switches meet EN 418 for compliance with European machine directives for emergency stop applications. They're rated NEMA 4, 13, and IP65 for protection from washdowns and oil/coolant spraying.

Key reset switches are keyed alike, so if you buy multiple switches they will all reset with the same key.

Plastic Actuator 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	No. of Keys Included		Each
Key Reset
1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	Red	2.5 A @ 125 V AC, 6 A @ 24 V DC	250V AC	1 1/16"	1 11/16"	1	2	00000000	0000000

Mounting Wrench	00000000	Each	00000
Contact Block Removal Tool	00000000	Each	0000

Aluminum Emergency Stop Enclosed Push-Button Switches

These aluminum switches are rated NEMA 4, NEMA 13, and IP66 for protection from washdowns and oil/coolant spraying. Housed in a yellow enclosure for quick identification, they immediately cut power with a single push. They meet EN 60947-5-1 for compliance with European machine directives for emergency stop applications. All have positive force contacts that will open a circuit when actuated even if a spring fails or the contacts stick. UL listed and CSA certified, they also meet American and Canadian safety standards. The front of these switches is UL recognized.

Key reset switches stop you from accidentally resetting the switch before you’ve dealt with the emergency. They’re keyed alike, meaning they all open with the same key.

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

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

Keyed Reset (including 2 Keys)

Keyed Reset

									Mounting
No. of Buttons	Actuator Color (Industry Designation)	No. of Circuits Controlled per Button	Switch Starting Position	Switch Action	No. of Terminals per Button	Switching Current @ Voltage	Dia.	Conduit Knockout Size	Fasteners Included	No. of Holes	Hole Dia.		Each
With Screw Terminals— 600V AC/600V DC Max. Voltage
1	Red (SPST-NC)	1	1 On (Normally Closed)	Stays Switched (Maintained)	2	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	0000000
1	Red (DPST-NC)	2	2 On (Normally Closed)	Stays Switched (Maintained)	4	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000

Illuminated Pull Reset

										Mounting
No. of Buttons	Actuator Color (Industry Designation)	No. of Circuits Controlled per Button	Bulb Voltage	Switch Starting Position	Switch Action	No. of Terminals per Button	Switching Current @ Voltage	Dia.	Conduit Knockout Size	Fasteners Included	No. of Holes	Hole Dia.		Each
With Screw Terminals— 600V AC/600V DC Max. Voltage
1	Red (SPST-NC)	1	24V AC, 24V DC	1 On (Normally Closed)	Stays Switched (Maintained)	2	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	0000000
1	Red (SPST-NC)	1	120V AC	1 On (Normally Closed)	Stays Switched (Maintained)	2	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000
1	Red (SPST-NC)	1	240V AC	1 On (Normally Closed)	Stays Switched (Maintained)	2	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000
1	Red (DPST-NC)	2	24V AC, 24V DC	2 On (Normally Closed)	Stays Switched (Maintained)	4	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000
1	Red (DPST-NC)	2	120V AC	2 On (Normally Closed)	Stays Switched (Maintained)	4	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000
1	Red (DPST-NC)	2	240V AC	2 On (Normally Closed)	Stays Switched (Maintained)	4	6 A @ 120 V AC, 2.5 A @ 24 V DC	1 9/16"	PG-16	No	4	3/16"	00000000	000000

Replacement Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Environmental Rating		Each
1	1 On (Normally Closed)	2	SPST-NC	IP20	0000000	000000

Replacement Keys for Keyed Reset

Pkg. Qty.		Pkg.
2	00000000	00000

Plastic Emergency Stop Enclosed Push-Button Switches

Rated NEMA 3S, NEMA 4X, NEMA 13, and IP66, these plastic switches resist corrosion better than aluminum switches and withstand washdowns and oil/coolant spraying. Housed in a yellow enclosure for quick identification, they immediately cut power with a single push. They meet EN 418 for compliance with European machine directives for emergency stop applications. All have positive force contacts that will open a circuit when actuated even if a spring fails or the contacts stick.

Key reset switches are keyed alike, so if you buy multiple switches they will all reset with the same key.

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

Key Reset

											Mounting
No. of Buttons	Actuator Color	No. of Circuits Controlled per Button	Switch Starting Position	Switch Action	No. of Terminals per Button	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Conduit Trade Size	Fasteners Included	No. of Holes	Hole Dia.		Each
With Screw-Clamp Terminals
Key Reset (including 2 Keys)
1	Red	1	1 On (Normally Closed)	Stays Switched (Maintained)	2	SPST-NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1/2	No	2	3/16"	0000000	000000
1	Red	2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1/2	No	2	3/16"	0000000	00000
1	Red	2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 9/16"	1/2	No	2	3/16"	0000000	00000

Replacement Actuator for Switches with Key Reset

0000000

Each

000000

Replacement Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation		Each
1	1 On (Normally Closed)	2	SPST-NC	0000000	00000

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

Choose an actuator and contact block to make your own switch. Actuators are rated NEMA 3S, 4X and 13 for protection from dust, outdoor environments, corrosion, oil, and washdowns. Use legend plates (not included) to label switches. BACO Controls switches are only compatible with BACO manufactured legend plates.

Mounting tools make it easier to install switches in crowded panels.

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

Push-Button Actuators

Triangular Mushroom with Key Reset

Triangular Mushroom with Key Reset
Switch Action	Dia.	For Max. No. of Contact Blocks	No. of Keys Included	Environmental Rating	Specifications Met	Manufacturer	Actuator Color		Each
Stays Switched (Maintained)	1 5/8"	6	2	NEMA 3S, NEMA 4X, NEMA 13, IP66, IK05	UL Recognized Component, C-UL Recognized Component, UL 508	BACO Controls	Red	0000000	000000

Mounting Tool

0000000

Each

00000