20A Relays | McMaster-Carr

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	Input Voltage Input Voltage

20-275V AC

4-32V DC

5-32V DC

24-190V DC

	Switching Voltage Switching Voltage

	Number of Terminals Number of Terminals

	Industry Designation Industry Designation

	Switching Current Switching Current	Show

20A

	Switching Current Switching Current	Hide

	Mounting Location Mounting Location

Relay Socket

DIN Rail

Surface

	Number of Circuits Controlled Number of Circuits Controlled

	Electrical Phase Electrical Phase

Single

Three

	Power Power

	Operation Type Operation Type

Mechanical

Solid State

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

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

2 Off (Normally Open)

3 Off (Normally Open)

4 Off (Normally Open)

4 Off (Normally Open) or 4
On (Normally Closed)

	Relay Type Relay Type

	Standard

	Application Application

Power

	Auxiliary Contact Switch Starting Position Auxiliary Contact Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

	Load Type Load Type

Full

Resistive

	Depth Depth

	Width Width

	Height Height

	Switch Action Switch Action

Springs Back (Momentary)

	Wire Connection Type Wire Connection Type


Screw Terminals	Quick- Disconnect Terminals

	Mechanical Life Cycles Mechanical Life Cycles

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

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55 Products

About Relays

4 Circuits

Use these relays with industrial automation systems, security and emergency lighting, and small motors. Also known as power relays.

Optional covers protect contacts from dust and dirt.

Relays
			Switching Current									Optional Covers
Number of Terminals	Input Voltage	Control Current, mA	@ 120V AC	@ 28V DC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each		Each
4 Circuits Controlled with 4 Off (Normally Open) or 4 On (Normally Closed)—4PDT
14	120V AC	116	35A	20A	1 1/2 hp @ 240 V AC 1 hp @ 120 V AC	3.4"	2.7"	2.7"	UL Listed C-UL Listed	0000000	0000000	0000000	000000

High-Current Relays

3 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.

			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
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
With 1 Auxiliary Contact—1 Off (Normally Open)
10	24V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	000000
10	120V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	00000
10	240V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	00000
10	24V DC	3.2W	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	00000000	00000
With 1 Auxiliary Contact—1 On (Normally Closed)
10	24V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	00000
10	120V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	00000
10	240V AC	4VA	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	000000000	00000
10	24V DC	3.2W	6A	20A	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 5 hp @ 600 V AC	2.3"	1.7"	2.2"	UL Listed C-UL Listed	00000000	00000

Front-Mount Auxiliary Contact for Relays Rated 6 Full-Load Amps—1 Off (Normally Open) and 1 On (Normally Closed)

00000000

Each

000000

DIN-Rail Mount Long-Life High-Current Relays

1 Circuit

3 Circuit

With no moving parts, these solid state relays have an extended service life. Mount them directly to 35 mm DIN rail. They have an integrated heat sink that disperses heat to provide optimal convection cooling. An LED indicator tells you if they are open or closed. Relays are rated for continuous operating duty. They do not switch DC loads.

1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
Number of Terminals	Input Voltage	Control Current, mA	Full Load Switching Current @ 600V AC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Specifications Met		Each
Single Phase
4	4-32V DC	10	20A	1/3 hp @ 115 V AC 1 hp @ 230 V AC	4.2"	0.7"	4.1"	UL Listed C-UL Listed CE Marked	0000000	000000
4	20-275V AC/24-190V DC	13	20A	1/3 hp @ 115 V AC 1 hp @ 230 V AC	4.2"	0.7"	4.1"	UL Listed C-UL Listed CE Marked	0000000	00000
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
Three Phase
4	5-32V DC	32	20A	3 hp @ 230 V AC 7 1/2 hp @ 480 V AC	4.3"	2.1"	4.1"	UL Listed C-UL Listed CE Marked	0000000	000000
4	20-275V AC/24-190V DC	38	20A	3 hp @ 230 V AC 7 1/2 hp @ 480 V AC	4.3"	2.1"	4.1"	UL Listed C-UL Listed CE Marked	0000000	000000

Infrequent-Cycle High-Current Relays

2 Circuits

3 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).

			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
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
With Quick-Disconnect and Screw Terminals
4	24V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	120V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	24V DC	3.1W	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	6.5VA	20A	30A	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
4	208/240V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
With Quick-Disconnect and Screw Terminals
6	24V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
6	120V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
6	24V DC	3.1W	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
6	208/240V AC	7VA	15A	20A	3/4 hp @ 115 V AC 2 hp @ 230 V AC	3 hp @ 230 V AC 5 hp @ 460 V AC 5 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000

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

00000000

Each

0000000

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.

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	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	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	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	00000
Relays with 1 Off (Normally Open) Auxiliary Contact
3 Circuits Controlled with 3 Off (Normally Open)—3PST-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	00000
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	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	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	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-NO/NC	Front	00000000	000000
2	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-NO/NC	Side	00000000	00000

High-Starting-Current Vehicle Relays

5-Terminal Relay for Relay Socket

5-Terminal Relay for Relay Socket and Surface Mounting

Relay Socket with Wire Leads

Relay Socket with
Crimp-On
Terminals

Also known as automotive relays, these relays can handle high starting (inrush) currents.

Relays for surface mounting have a tab for added security in high-vibration applications.

Relays
		Switching Current @ Voltage										Relay Sockets with Crimp-On Terminals		Relay Sockets with Wire Leads
Number of Terminals	Input Voltage	Off (Normally Open) Circuit Position	On (Normally Closed) Circuit Position	Max. Starting Current, A	Control Current, mA	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each		Each		Each
For Relay Socket
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
5	24V DC	20 A @ 24 V DC	__	120	69	1"	1"	0.9"	0.25"	0000000	00000	0000000	00000	0000000	000000
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
5	12V DC	30 A @ 12 V DC	20 A @ 12 V DC	150	138	1.02"	1.02"	0.94"	0.25"	0000000	0000	0000000	0000	0000000	00000
5	24V DC	20 A @ 24 V DC	10 A @ 24 V DC	150	99	1"	1"	1"	0.25"	0000000	0000	0000000	0000	0000000	00000
For Relay Socket and Surface Mounting
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
5	12V DC	30 A @ 12 V DC	20 A @ 12 V DC	150	138	1.1"	1.1"	1"	0.25"	0000000	0000	0000000	0000	0000000	00000
5	24V DC	20 A @ 24 V DC	10 A @ 24 V DC	120	109	1"	1"	0.9"	0.25"	0000000	0000	0000000	0000	0000000	00000

Weatherproof High-Starting-Current Vehicle Relays

Relay

Relay Socket with
Crimp-On
Terminals

Relay Socket with Wire Leads

The extended housing covers and protects terminals. Also known as automotive relays, they can handle high starting (inrush) currents. They have a tab for added security in high-vibration applications.

Relays
		Switching Current @ Voltage										Relay Sockets with Crimp-On Terminals		Relay Sockets with Wire Leads
Number of Terminals	Input Voltage	Off (Normally Open) Circuit Position	On (Normally Closed) Circuit Position	Max. Starting Current, A	Control Current, mA	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each		Each		Each
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
5	12V DC	30 A @ 12 V DC	20 A @ 12 V DC	150	138	1.4"	1.4"	1.8"	0.25"	0000000	000000	0000000	000000	0000000	000000
5	24V DC	20 A @ 24 V DC	10 A @ 24 V DC	120	107	1.4"	1.4"	1.8"	0.25"	0000000	00000	0000000	00000	0000000	00000

Long-Life High-Starting-Current Vehicle Relays

Relay

Relay Socket with Wire Leads

Relay Socket with
Crimp-On
Terminals

With no moving parts, these solid state relays have an extended service life. They can handle high starting (inrush) currents. Also known as automotive relays.

Relays											Relay Sockets with Crimp-On Terminals		Relay Sockets with Wire Leads
Number of Terminals	Input Voltage	Switching Current @ 12V DC	Max. Starting Current, A	Control Current, mA	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each		Each		Each
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
4	12V DC	20A	80	10	1.1"	1.1"	1"	0.25"	0000000	000000	0000000	00000	0000000	000000

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About Relays

Medium-Current Relays

High-Current Relays

DIN-Rail Mount Long-Life High-Current Relays

Infrequent-Cycle High-Current Relays

DIN-Rail Mount Infrequent-Cycle High-Current Relays

High-Starting-Current Vehicle Relays

Weatherproof High-Starting-Current Vehicle Relays

Long-Life High-Starting-Current Vehicle Relays