4PST-2NO/2NC Switches | McMaster-Carr

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	Number of Positions Number of Positions

	Number of Circuits Controlled Number of Circuits Controlled

	Actuator Style Actuator Style


Lever	Key

	Switch Starting Position Switch Starting Position

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

	Number of Terminals Number of Terminals

	System of Measurement System of Measurement

Inch

	For Panel Cutout Diameter For Panel Cutout Diameter

1 3/16"

30 mm

	Switching Voltage Switching Voltage

	Switch Action Switch Action

Stays Switched (Maintained)

Springs Back (Momentary)

	Wire Connection Type Wire Connection Type

	Screw Terminals

	Actuator Base Material Actuator Base Material

Metal

	Industry Designation Industry Designation	Show

4PST-2NO/2NC

	Industry Designation Industry Designation	Hide

	Diameter Diameter

1 5/16"

	Mounting Location Mounting Location

DIN Rail

Panel

Surface

	Maximum Voltage Maximum Voltage

	Illumination Illumination

Not Illuminated

Illuminated

	Terminal Numbering Terminal Numbering

1-2, 3-4

	Environmental Rating Environmental Rating

	Actuator Color Actuator Color

	Black

	Environment Environment

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

	Specifications Met Specifications Met

CE Marked

CSA

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

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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22 Products

Choosing an Electrical Switch

About Relays

Metal 30 mm Panel-Mount Lever Switches

Rated NEMA 4, 13, and IP66, these switches are protected from washdowns and oil/coolant spraying. They include enough contact blocks to control the number of circuits listed. The contact block is rated IP20.

Three-position switches are off in the center position.

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

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

3 Position
Lever Lg.	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	Actuator Color		Each
With Screw Terminals
15/16"	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	1 5/16"	2 3/4"	4	Black	000000	0000000

Contact Blocks

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Specifications Met		Each
1	1 Off (Normally Open)	2	SPST-NO	CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4	0000000	000000
1	1 On (Normally Closed)	2	SPST-NC	CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4	0000000	00000
2	1 Off (Normally Open) and 1 On (Normally Closed)	4	DPST-1NO/1NC	CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4	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.

Contact blocks with mounting latch accept additional contact blocks to control more circuits.

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

Contact Blocks with Mounting Latch

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dp. Behind Panel	Wire Connection Type	Environmental Rating	Specifications Met		Each
4	2 Off (Normally Open) and 2 On (Normally Closed)	8	4PST-2NO/2NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	2"	Screw Terminals	IP20	UL Listed, C-UL Listed, CE Marked	0000000	000000

Replacement Contact Retaining Clip

000000

Each

00000

Contact Blocks with Mounting Latch, Bulb, and Bulb Holder

No. of Circuits Controlled	Switch Starting Position	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dp. Behind Panel	Wire Connection Type	Environmental Rating	Specifications Met	Choose a Bulb Voltage	Choose a Bulb Color		Each
4	2 Off (Normally Open) and 2 On (Normally Closed)	10	4PST-2NO/2NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	600V AC 600V DC	2 9/16"	Screw Terminals	IP20	UL Listed, C-UL Listed, CE Marked	120V AC, 240V AC, 24V AC, 24V DC	Green, Red, White, Yellow	0000000	000000

Replacement Contact Retaining Clip

000000

Each

00000

Replacement Bulb Holders

Bulb Voltage	Bulb Type	Environmental Rating	Specifications Met	Choose a Bulb Color		Each
24V AC/24V DC	LED	IP20	UL Listed, C-UL Listed, CE Marked	Green, Red, White, Yellow	0000000	000000
120V AC	LED	IP20	UL Listed, C-UL Listed, CE Marked	Green, Red, White, Yellow	0000000	00000
240V AC	LED	IP20	UL Listed, C-UL Listed, CE Marked	Green, Red, White, Yellow	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, C-UL Listed, CE Marked	000000	00000

Frame-Mounted Safety Switches

Key Shown Actuating from the Side

Also known as interlock switches, these ensure the safety of personnel by automatically shutting off power to machinery when an access door opens. Mount the switch to the door frame and mount a key to the door so that the key is inserted into the switch when the door is closed. When the door opens, the key is removed from the switch and the machine shuts down. They’re often used with machine guards.

IP67 rated switches protect against temporary submersion.

Flexible keys (sold separately) pivot 15° to make it easier to align with the switch during installation.

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

Safety Switches

								Housing
Style	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Ht.	Wd.	Dp.	Conduit Trade Size	Key Included	Environmental Rating		Each
Screw Terminal Connection with Rotating Head
G	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	No	IP67	00000000	0000000

Replacement Actuator Keys

			O'all
	Angle Range	Adjustability	Lg.	Wd.	Mounting Fasteners Included		Each
Straight Keys
For Style G	__	__	48.5mm	35mm	No	00000000	000000
Flexible Keys
For Style G	0°-15°	Up/Down/Left/Right	50.4mm	55mm	No	00000000	00000

Access-Delay Frame-Mounted Safety Switches

Key Shown Actuating from the Side

Delay access to hazardous areas until conditions are safe; use these switches with machines that take time to stop after they are turned off. Mount the switch to the door frame and mount the key to the door so that the key is inserted into the switch when the door is closed. When the door is pulled, the key is held in place with 225 lbs. of force until the switch receives a signal from a time-delay relay, motion sensor, or position sensor (not included) that the machine’s motion has stopped. After the motion has stopped, the key can be removed from the switch, releasing the access door. They’re often used with machine guards. All have positive-force, normally-closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick. They’re rated for protection from washdowns and temporary submersion.

Style C has a key entry on two opposite sides of the switch.

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

										Housing
Style	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Input Voltage	Holding Force, lbs.	Ht.	Wd.	Dp.	Wire Connection Type	Conduit Trade Size		Each
Positive-Force Normally Closed Contacts and Rotating Head
C	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	4 A @ 120 V AC, 4 A @ 24 V DC	240V AC 24V DC	24V AC, 24V DC	225	7.6"	1.2"	1.6"	Screw Terminals	1/2	0000000	0000000

Screw Terminal Relays

Recessed screw terminals prevent accidental contact with live connections. These relays are built to International Electrotechnical Commission (IEC) dimensional standards.

Auxiliary contact (sold separately) allows you to add a signaling device or control another relay.

4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ 600V AC	Ht.	Wd.	Dp.	For DIN Rail Size, mm	Specifications Met		Each
10	24V DC	133	10A	2.3"	1.7"	2.2"	35	UL Listed, C-UL Listed	0000000	000000

Auxiliary Contacts

Number of Circuits Controlled	Switch Starting Position	Industry Designation	Mounting Location		Each
2	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Front	00000000	000000

Machine-Guard Safety Screw Terminal Relays

The interlocked opposing contacts won't close at the same time, so these relays are suitable for safety applications such as machine guarding. The screw terminals are recessed to prevent accidental contact with live connections. Relays are built to International Electrotechnical Commission (IEC) dimensional standards.

Auxiliary contact (sold separately) allows you to add a signaling device or control another relay.

4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ 600V AC	Ht.	Wd.	Dp.	For DIN Rail Size, mm	Specifications Met		Each
10	24V AC	125	10A	2.3"	1.7"	2.2"	35	UL Listed, C-UL Listed	00000000	000000
10	120V AC	25	10A	2.3"	1.7"	2.2"	35	UL Listed, C-UL Listed	00000000	00000
10	240V AC	12.5	10A	2.3"	1.7"	2.2"	35	UL Listed, C-UL Listed	00000000	00000

Auxiliary Contacts

Number of Circuits Controlled	Switch Starting Position	Industry Designation	Mounting Location		Each
2	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Front	00000000	000000

Enclosed Medium-Current Relays

4 Circuits

The built-in enclosure protects contacts from dust and dirt. These relays accept voltage drops up to 50% of the rated voltage without switching. Use them with industrial automation systems, security and emergency lighting, and small motors. Also known as power relays.

			Switching Current @ Voltage
Number of Terminals	Input Voltage	Control Current, mA	Off (Normally Open) Circuit Position	On (Normally Closed) Circuit Position	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each
4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC
With Screw Terminals
10	120V AC	22	25 A @ 220 V AC/24 V DC	8 A @ 220 V AC/24 V DC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	UL Recognized Component, CSA Certified, CE Marked	0000000	000000
10	24V DC	83	25 A @ 220 V AC/24 V DC	8 A @ 220 V AC/24 V DC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	UL Recognized Component, CSA Certified, CE Marked	0000000	00000