55A Relays | McMaster-Carr

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	Input Voltage Input Voltage

	Switching Current Switching Current	Show

55A

	Switching Current Switching Current	Hide

	Electrical Phase Electrical Phase

Single

Three

	Number of Circuits Controlled Number of Circuits Controlled

	Power Power

	Mounting Location Mounting Location

DIN Rail

Surface

	Load Type Load Type

Full

Resistive

	Switching Voltage Switching Voltage

600V AC

	Switch Starting Position Switch Starting Position

3 Off (Normally Open)

4 Off (Normally Open)

	Industry Designation Industry Designation

3PST-NO

4PST-NO

	Number of Terminals Number of Terminals

	Wire Connection Type Wire Connection Type

	Screw Terminals

	Operation Type Operation Type

Mechanical

	Height Height

3 1/2"

	Depth Depth

3 1/2"

4.2"

	Relay Type Relay Type

	Standard

	Mechanical Life Cycles Mechanical Life Cycles

20,000,000

	Specifications Met Specifications Met

UL Listed

C-UL Listed

UL 508

	Control Power Control Power

6.5VA

5.4W

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Mounting Hole Diameter Mounting Hole Diameter

0.17"

	Number of Mounting Holes Number of Mounting Holes

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10 Products

About 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	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	0000000
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	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	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

			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	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	0000000
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	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	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

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