4PST-2NO/2NC Safety Switches

Filter by

Switch Starting Position

2 Off and 2 On

System of Measurement

Switching Voltage

Actuator Style

Switch Designation

Switching Current

Conduit Thread Type

Input Voltage

Switch Action

Number of Terminals

Housing Width

1.2"

1.5"

Number of Circuits Controlled

Certification

Key Included

Wire Connection

Environment

Key Entry

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

Enclosure Rating

Switch Type

Conduit Trade Size

Housing Height

Mounting Hole Diameter

15 Products

Choosing an Electrical Switch

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 for large robots.

All switches require an actuator key, but not all include one—check whether you need to pick out a separate actuator key. For some switch styles, you can also select the mounting orientation of the key. Flexible keys pivot at least 15°, making them easier to align with switches during installation.

IP67 rated switches protect against temporary submersion.

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

Safety Switches

								Housing			Conduit
Style	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Ht.	Wd.	Dp.	Trade Size	Thread Type	Key Included	Environmental Rating		Each
Screw Terminal Connection with Rotating Head
H	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	NPT	No	IP67	00000000	0000000

Actuator Keys

Straight

Flexible

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

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. They mount into standard panel cutouts. 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

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