50A Relays | McMaster-Carr

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	Switching Current Switching Current	Show

50A

	Switching Current Switching Current	Hide

	Input Voltage Input Voltage

	Switching Voltage Switching Voltage

	Number of Terminals Number of Terminals

	Number of Circuits Controlled Number of Circuits Controlled

	Electrical Phase Electrical Phase

Single

Three

	Industry Designation Industry Designation

	Mounting Location Mounting Location

Relay Socket

DIN Rail

Surface

	Operation Type Operation Type

Mechanical

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

2 Off (Normally Open)

3 Off (Normally Open)

4 Off (Normally Open)

	Power Power

	Mechanical Life Cycles Mechanical Life Cycles

	Relay Type Relay Type

	Standard

	Number of Mounting Holes Number of Mounting Holes

	Mounting Hole Diameter Mounting Hole Diameter

	Width Width

	Height Height

	Depth Depth

	Wire Connection Type Wire Connection Type

Screw Terminals

Quick-Disconnect Terminals

Stud Terminals

	Load Type Load Type

Full

Resistive

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Application Application

Power

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

RoHS Compliant

RoHS Compliant with
Exemptions

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42 Products

About Relays

4-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	Max. Starting Current, A	Control Current, mA	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each		Each		Each
For Relay Socket and Surface Mounting
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
4	12V DC	50 A @ 12 V DC	150	138	1.2"	1"	1"	0.25" and 0.375"	0000000	000000	0000000	00000	0000000	000000

High-Current Vehicle Relays

9VA Control Power

These relays are suitable for DC-powered equipment such as forklifts, floor scrubbers, and trucks. They are rated for continuous operation for cycles that run longer than 30 seconds.

4- and 6-terminal relays allow different input and switching voltages.

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

1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
Number of Terminals	Input Voltage	Control Power, VA	Full Load Switching Current @ Voltage	Ht.	Wd.	Dp.	Wire Connection Type	Stud Thread Size		Each
4	24V DC	9	50 A @ 24 V DC	2.5"	3.5"	2.4"	Stud Terminals	5/16"-24	0000000	000000
4	36V DC	9	50 A @ 36 V DC	2.5"	3.5"	2.4"	Stud Terminals	5/16"-24	0000000	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

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
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
10	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"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	0000000
10	24V AC	6.5VA	50A	55A	3 hp @ 120 V AC 10 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
10	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"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
10	120V AC	6.5VA	50A	55A	3 hp @ 120 V AC 10 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
10	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"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
10	230V AC	6.5VA	50A	55A	3 hp @ 120 V AC 10 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	1.8"	3.5"	UL Listed C-UL Listed UL 508	00000000	000000
10	24V DC	5.4W	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"	1.8"	4.2"	UL Listed C-UL Listed UL 508	0000000	000000
10	24V DC	5.4W	50A	55A	3 hp @ 120 V AC 10 hp @ 240 V AC	15 hp @ 240 V AC 30 hp @ 480 V AC 40 hp @ 600 V AC	3.5"	1.8"	4.2"	UL Listed C-UL Listed UL 508	0000000	000000
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
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	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	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

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

1 Circuit

2 Circuits

3 Circuits

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
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
With Quick-Disconnect and Screw Terminals
2	24V AC	6VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
2	120V AC	6VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
2	208/240V AC	6VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
With Quick-Disconnect and Screw Terminals
4	24V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 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	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	120V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	3.1W	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	24V DC	3.1W	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	6.5VA	40A	50A	3 hp @ 115 V AC 7 1/2 hp @ 230 V AC	__	3.2"	2"	2.3"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4	208/240V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
With Quick-Disconnect and Screw Terminals
6	24V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	24V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	120V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	120V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	24V DC	3.1W	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	24V DC	3.1W	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	208/240V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	208/240V AC	10VA	50A	65A	3 hp @ 115 V AC 10 hp @ 230 V AC	15 hp @ 230 V AC 30 hp @ 460 V AC 30 hp @ 575 V AC	3.8"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
With Quick-Disconnect and Screw Terminals
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	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	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	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

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About Relays

High-Starting-Current Vehicle Relays

High-Current Vehicle Relays

DIN-Rail Mount Infrequent-Cycle High-Current Relays

Infrequent-Cycle High-Current Relays