4PST-NO Switches | McMaster-Carr

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59 Products

Choosing an Electrical Switch

Rounded Toggle

To view switch wiring diagrams, select a part number and click Product Detail.

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

2 Position with Rounded Toggle
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Position Designation	Switching Current @ Voltage	Max. Voltage	For Max. Panel Thick.	Mounting Hardware Included	Choose a Wire Connection Type		Each
For 1/2" Panel Cutout Dia.
4	4 Off (Normally Open)	Stays Switched (Maintained)	8	4PST-NO	On-Off	15 A @ 125 V AC/28 V DC	28V DC 250V AC	0.13"	Yes	Screw Terminals, Solder Lugs	00000000	000000

High-Current Toggle Switches

Able to withstand high currents, these switches are often used with motors and pumps.

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

2 Position with Quick-Disconnect Terminals
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Position Designation	Switching Current @ Voltage	Max. Voltage	Dp. Behind Panel	Mounting Hardware Included		Each
For 1/2" Panel Cutout Dia.
4	4 Off (Normally Open)	Stays Switched (Maintained)	8	4PST-NO	On-Off	20 A @ 125 V AC, 20 A @ 30 V DC	30V DC 250V AC	1.3"	Yes	0000000	000000

High-Current Time and Day Activated Switches

Control equipment with high currents such as landscape lighting, pumps, and heaters. Program these switches to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times.

Seven-day switches can perform a different program each day of the week.

Additional trippers (sold separately) are sold in pairs that include one “on” tripper and one “off” tripper.

Switches															Additional Trippers
No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage	Maximum On/Off Cycles	Minimum Set Time	Tripper Type	No. of Trippers	Industry Designation	Ht.	Wd.	Dp.	Wire Connection Type	Environment		Each	Pkg. Qty.		Pkg.
7-Day Timing Cycle
4	40 A @ 240 V AC	120V AC	3 per Day	3.5 hrs.	Removable	4	4PST-NO	12 1/2"	8 1/4"	4"	Screw Terminals	Indoor Only	00000000	0000000	7	00000000	000000

DIN-Rail Mount Touch-Safe Screw Terminal Relays

Quickly and safely mount these relays on 35 mm DIN rail (also known as DIN 3). IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits.

Relays that control 3 and 4 circuits are built to IEC dimensional standards and are often called IEC contactors.

Auxiliary contacts (sold separately) allow you to add a signaling device or control another relay. You can add one auxiliary contact to all of these relays. For relays with 12 terminals, you can add two side-mount auxiliary contacts.

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

Relay

		Control				hp @ Switching Voltage
Number of Terminals	Input Voltage	Power	Current, mA	Switching Current @ Voltage (Load Type)	Max. Switching Voltage	Single Phase	Three Phase	Ht.	Wd.	Dp.		Each
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
10	24V AC	__	125	10 A @ 600 V AC	600 V AC	__	__	2.3"	1.7"	2.2"	00000000	000000
10	120V AC	__	25	10 A @ 600 V AC	600 V AC	__	__	2.3"	1.7"	2.2"	00000000	00000
10	240V AC	__	12.5	10 A @ 600 V AC	600 V AC	__	__	2.3"	1.7"	2.2"	00000000	00000
10	24V DC	__	133	10 A @ 600 V AC	600 V AC	__	__	2.3"	1.7"	2.2"	0000000	000000
12	24V AC	6.5VA	__	25 A @ 600 V AC (Resistive Load) 9 A @ 600 V AC (Full Load)	600 V AC	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"	000000000	00000
12	24V AC	6.5VA	__	11 A @ 600 V AC (Full Load) 28 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	00000
12	24V AC	6.5VA	__	17 A @ 600 V AC (Full Load) 32 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	24V AC	6.5VA	__	22 A @ 600 V AC (Full Load) 45 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	24V AC	6.5VA	__	32 A @ 600 V AC (Full Load) 55 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	120V AC	6.5VA	__	25 A @ 600 V AC (Resistive Load) 9 A @ 600 V AC (Full Load)	600 V AC	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"	000000000	00000
12	120V AC	6.5VA	__	11 A @ 600 V AC (Full Load) 28 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	00000
12	120V AC	6.5VA	__	17 A @ 600 V AC (Full Load) 32 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	120V AC	6.5VA	__	22 A @ 600 V AC (Full Load) 45 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	120V AC	6.5VA	__	32 A @ 600 V AC (Full Load) 55 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	240V AC	6.5VA	__	25 A @ 600 V AC (Resistive Load) 9 A @ 600 V AC (Full Load)	600 V AC	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"	000000000	00000
12	240V AC	6.5VA	__	11 A @ 600 V AC (Full Load) 28 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	00000
12	240V AC	6.5VA	__	17 A @ 600 V AC (Full Load) 32 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	240V AC	6.5VA	__	22 A @ 600 V AC (Full Load) 45 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	240V AC	6.5VA	__	32 A @ 600 V AC (Full Load) 55 A @ 600 V AC (Resistive Load)	600 V AC	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"	000000000	000000
12	24V DC	5.4W	__	25 A @ 600 V AC (Resistive Load) 9 A @ 600 V AC (Full Load)	600 V AC	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"	00000000	000000
12	24V DC	5.4W	__	17 A @ 600 V AC (Full Load) 32 A @ 600 V AC (Resistive Load)	600 V AC	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"	00000000	000000
12	24V DC	5.4W	__	22 A @ 600 V AC (Full Load) 45 A @ 600 V AC (Resistive Load)	600 V AC	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"	00000000	000000
12	24V DC	5.4W	__	32 A @ 600 V AC (Full Load) 55 A @ 600 V AC (Resistive Load)	600 V AC	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"	00000000	000000

Auxiliary Contacts

Side-Mount Auxiliary Contact

Front-Mount Auxiliary Contact

Number of Circuits Controlled	For Relay Width	Switch Starting Position	Industry Designation	Mounting Location		Each
2	1.7"	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Front	00000000	000000
2	1.8", 2.4"	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Front	00000000	00000
2	1.8", 2.4"	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Side	00000000	00000

Touch-Safe DIN-Rail Mount Infrequent-Cycle Relays

Operate equipment that cycles on and off from your control cabinet. Often called definite-purpose contactors, these relays meet UL 508 for use with air conditioning and heating. They mount directly to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. These relays have recessed terminals that prevent fingers and other objects from touching live circuits.

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

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

12 Terminals

			Switching Current @ 600V AC			hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Power	Full Load	Resistive Load	Max. Switching Voltage	Single Phase	Three Phase	Ht.	Wd.	Dp.		Each
Relays
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
12	24V AC	6.5VA	20A	30A	600V AC	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"	00000000	000000
12	24V AC	6.5VA	25A	30A	600V AC	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"	00000000	00000
12	24V AC	6.5VA	30A	32A	600V AC	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"	00000000	00000
12	24V AC	6.5VA	40A	50A	600V AC	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"	00000000	000000
12	120V AC	6.5VA	20A	30A	600V AC	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"	00000000	00000
12	120V AC	6.5VA	25A	30A	600V AC	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"	00000000	00000
12	120V AC	6.5VA	30A	32A	600V AC	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"	00000000	00000
12	120V AC	6.5VA	40A	50A	600V AC	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"	00000000	000000
12	240V AC	6.5VA	20A	30A	600V AC	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"	00000000	00000
12	240V AC	6.5VA	25A	30A	600V AC	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"	00000000	00000
12	240V AC	6.5VA	30A	32A	600V AC	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"	00000000	00000
12	240V AC	6.5VA	40A	50A	600V AC	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"	00000000	000000
12	24V DC	5.4W	20A	30A	600V AC	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"	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 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.		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"	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"	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"	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"	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"	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"	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"	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"	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"	00000000	000000
8	208V AC, 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"	00000000	000000
8	208V AC, 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"	00000000	000000
8	208V AC, 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"	00000000	000000

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

00000000

Each

0000000

Screw Terminal Relays

Use the screw terminals to hardwire these relays. The built-in enclosure protects contacts from dust and dirt. These relays accept voltage drops up to 50% of the rated voltage without switching. They’re often used 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	Maximum Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.		Each
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
10	120V AC	22	25 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	000000
10	240V AC	11	25 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
10	24V DC	83	25 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000