4PST-NO Relays | McMaster-Carr

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	Input Voltage Input Voltage

	Mounting Location Mounting Location

DIN Rail

Surface

	Switching Current Switching Current

	Number of Circuits Controlled Number of Circuits Controlled

	Industry Designation Industry Designation	Show

4PST-NO

	Industry Designation Industry Designation	Hide

	Switching Voltage Switching Voltage

	Switch Starting Position Switch Starting Position

4 Off (Normally Open)

	Electrical Phase Electrical Phase

Single

Three

	Relay Type Relay Type

	Standard

	Wire Connection Type Wire Connection Type

Screw Terminals

Quick-Disconnect Terminals

Terminal Block

	Power Power

	Number of Terminals Number of Terminals

	Specifications Met Specifications Met

CSA

CE Marked

	Operation Type Operation Type

Mechanical

	Application Application

Power

	Width Width

	Height Height

	Switch Action Switch Action

Springs Back (Momentary)

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

0.17"

0.18"

1/4"

	Mechanical Life Cycles Mechanical Life Cycles

500,000

1,000,000

20,000,000

	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

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56 Products

About Relays

Choosing a Proximity Switch

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 4 Off (Normally Open)—4PST-NO
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
10	24V DC	133	10A	2.3"	1.7"	2.2"	35	UL Listed, C-UL Listed	0000000	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	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
With Screw Terminals
10	120V AC	22	25 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	240V AC	11	25 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
10	24V DC	83	25 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

High-Current Relays

4 Circuits

Use these relays with large motors and lighting systems. Also known as IEC contactors, they are built to International Electrotechnical Commission (IEC) dimensional standards. All have recessed terminals to prevent contact with live connections. Mount to 35 mm DIN rail.

Auxiliary contacts allow you to add a signaling device or control another relay. Add one front-mount contact per relay or two side-mount contacts per relay.

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

			Switching Current @ 600V AC		hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Power	Full Load	Resistive Load	Single Phase	Three Phase	Ht.	Wd.	Dp.	Specifications Met		Each
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
12	24V AC	6.5VA	9A	25A	3/4 hp @ 120 V AC 2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	000000
12	24V AC	6.5VA	11A	28A	1 hp @ 120 V AC 2 hp @ 240 V AC	5 hp @ 240 V AC 7 1/2 hp @ 480 V AC 10 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	00000
12	24V AC	6.5VA	17A	32A	1 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	000000
12	24V AC	6.5VA	22A	45A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	24V AC	6.5VA	32A	55A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 30 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	120V AC	6.5VA	9A	25A	3/4 hp @ 120 V AC 2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	00000
12	120V AC	6.5VA	11A	28A	1 hp @ 120 V AC 2 hp @ 240 V AC	5 hp @ 240 V AC 7 1/2 hp @ 480 V AC 10 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	00000
12	120V AC	6.5VA	17A	32A	1 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	000000
12	120V AC	6.5VA	22A	45A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	120V AC	6.5VA	32A	55A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 30 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	240V AC	6.5VA	9A	25A	3/4 hp @ 120 V AC 2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	00000
12	240V AC	6.5VA	11A	28A	1 hp @ 120 V AC 2 hp @ 240 V AC	5 hp @ 240 V AC 7 1/2 hp @ 480 V AC 10 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	00000
12	240V AC	6.5VA	17A	32A	1 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed	000000000	000000
12	240V AC	6.5VA	22A	45A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	240V AC	6.5VA	32A	55A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 30 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed	000000000	000000
12	24V DC	5.4W	9A	25A	3/4 hp @ 120 V AC 2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC	3.2"	1.8"	3.9"	UL Listed C-UL Listed	00000000	000000
12	24V DC	5.4W	17A	32A	1 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.9"	UL Listed C-UL Listed	00000000	000000
12	24V DC	5.4W	22A	45A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.5"	2.4"	4.2"	UL Listed C-UL Listed	00000000	000000
12	24V DC	5.4W	32A	55A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 30 hp @ 600 V AC	3.5"	2.4"	4.2"	UL Listed C-UL Listed	00000000	000000

Front-Mount Auxiliary Contact for Relays Rated 9-32 Full-Load Amps—1 Off (Normally Open) and 1 On (Normally Closed)	00000000	Each	000000
Side-Mount Auxiliary Contact for Relays Rated 9-32 Full-Load Amps—1 Off (Normally Open) and 1 On (Normally Closed)	00000000	Each	00000

DIN-Rail Mount Infrequent-Cycle High-Current Relays

Mount these relays directly to 35 mm DIN rail. For use with equipment that cycles on and off, they meet UL 508 for air conditioning and heating. All have recessed terminals to prevent contact with live connections. Also known as definite-purpose contactors.

Auxiliary contacts allow you to add a signaling device or control another relay.

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

3 Circuits with Auxiliary Contact and 4 Circuits

			Switching Current @ 600V AC		hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Power	Full Load	Resistive Load	Single Phase	Three Phase	Ht.	Wd.	Dp.	Specifications Met		Each
Relays
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
12	24V AC	6.5VA	20A	30A	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	000000
12	24V AC	6.5VA	25A	30A	2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	24V AC	6.5VA	30A	32A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	24V AC	6.5VA	40A	50A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	10 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
12	120V AC	6.5VA	20A	30A	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	120V AC	6.5VA	25A	30A	2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	120V AC	6.5VA	30A	32A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	120V AC	6.5VA	40A	50A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	10 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
12	230V AC	6.5VA	20A	30A	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	230V AC	6.5VA	25A	30A	2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	230V AC	6.5VA	30A	32A	2 hp @ 120 V AC 5 hp @ 240 V AC	7 1/2 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC	3.2"	1.8"	3.2"	UL Listed C-UL Listed UL 508	00000000	00000
12	230V AC	6.5VA	40A	50A	3 hp @ 120 V AC 7 1/2 hp @ 240 V AC	10 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	2.4"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
12	24V DC	5.4W	20A	30A	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC	5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC	3.2"	1.8"	3.9"	UL Listed C-UL Listed UL 508	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
2	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Side	00000000	00000

Infrequent-Cycle High-Current Relays

4 Circuits

For use with equipment that cycles on and off, these relays meet UL 508 for air conditioning and heating. Connections are accessible from the front, so you can mount relays side-by-side. Also known as definite-purpose contactors.

Enclosures (sold separately) are NEMA 1 rated to protect contacts from corrosion.

Also Available: Auxiliary contacts for 3.8"-7.2" Ht. relays. They allow you to add a signaling device or control another relay. Please select 6564K99, then select the McMaster-Carr part number of your relay and whether you want to switch one circuit on (1 Normally Open) or off (1 Normally Closed).

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

			Switching Current @ 600V AC		hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Power	Full Load	Resistive Load	Single Phase	Three Phase	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.	Specifications Met		Each
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
With Quick-Disconnect and Screw Terminals
8	24V AC	50.4VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	7 1/2 hp @ 230 V AC 10 hp @ 460 V AC 10 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	0000000
8	24V AC	50.4VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	10 hp @ 230 V AC 15 hp @ 460 V AC 15 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	24V AC	50.4VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	10 hp @ 230 V AC 20 hp @ 460 V AC 20 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	120V AC	50.4VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	7 1/2 hp @ 230 V AC 10 hp @ 460 V AC 10 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	120V AC	50.4VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	10 hp @ 230 V AC 15 hp @ 460 V AC 15 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	120V AC	50.4VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	10 hp @ 230 V AC 20 hp @ 460 V AC 20 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	24V DC	5.1W	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	7 1/2 hp @ 230 V AC 10 hp @ 460 V AC 10 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	24V DC	5.1W	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	10 hp @ 230 V AC 15 hp @ 460 V AC 15 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	24V DC	5.1W	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	10 hp @ 230 V AC 20 hp @ 460 V AC 20 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	208/240V AC	50.4VA	25A	35A	2 hp @ 115 V AC 3 hp @ 230 V AC	7 1/2 hp @ 230 V AC 10 hp @ 460 V AC 10 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	208/240V AC	50.4VA	30A	40A	2 hp @ 115 V AC 5 hp @ 230 V AC	10 hp @ 230 V AC 15 hp @ 460 V AC 15 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
8	208/240V AC	50.4VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	10 hp @ 230 V AC 20 hp @ 460 V AC 20 hp @ 575 V AC	3.8"	2.7"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000

Enclosures for 60A 3PST-NO Relays and 4PST-NO Relays

00000000

Each

0000000

Light Beam Safety Barrier Switches

Immediately cut power to machinery by breaking the light beam between the two barriers. Light beams can travel up to 32 feet between the transmitter and receiver. For a complete system, combine a transmitter, receiver, safety relay, and connectors (sold separately). Switches will automatically produce PNP or NPN signal output based on the device they are connected to. To selectively allow material to pass through the sensing field, you can program the system to allow one or more beams to be broken without shutting off your machine.

Note: These switches cannot be used with a full-revolution clutch press or machine. Use only with machinery that can consistently and immediately stop anywhere in its cycle.

Use safety relays when connecting these barrier switches to emergency stop switches.

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

Safety Relays

Input Voltage	No. of Circuits Controlled	Switching Current @ Voltage	Industry Designation	Wire Connection Type	Ht.	Wd.	Dp.	Features	For DIN Rail Ht., mm		Each
24V DC	4	2 A @ 240 V AC, 1.5 A @ 24 V DC	4PST-NO	Terminal Block	4.9"	0.89"	4.3"	Auxiliary PNP Output	35	0000000	0000000