Clear All

	Switching Voltage Switching Voltage

600V AC

28V DC

	Switch Action Switch Action

Springs Back (Momentary)

	Number of Terminals Number of Terminals

	Wire Connection Type Wire Connection Type


Quick- Disconnect Terminals	Screw Terminals

	System of Measurement System of Measurement

Inch

	Switching Current Switching Current	Show

35A

	Switching Current Switching Current	Hide

	Input Voltage Input Voltage

	Number of Circuits Controlled Number of Circuits Controlled

	Electrical Phase Electrical Phase

Single

Three

	Operation Type Operation Type

Mechanical

Solid State

	Industry Designation Industry Designation

	Width Width

	Power Power

	Maximum Setpoint Maximum Setpoint

125 psi

250 psi

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

2 Off (Normally Open)

2 On (Normally Closed)

3 Off (Normally Open)

4 Off (Normally Open)

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

	Mounting Location Mounting Location

Surface

	For Use With For Use With

Air

	Relay Type Relay Type

	Standard

	Load Type Load Type

Full

Resistive

	Specifications Met Specifications Met

CE Marked

CSA

	Height Height

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

DFARS Specialty Metals
COTS-Exempt

	Application Application

Power

View catalog pages (4)

Forward

How can we improve?

27 Products

About Pressure Switches

About Relays

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).

			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	25A	35A	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	120V AC	6.5VA	25A	35A	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	24V DC	3.1W	25A	35A	2 hp @ 115 V AC 3 hp @ 230 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	25A	35A	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
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
With Quick-Disconnect and Screw Terminals
6	24V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
6	120V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
6	24V DC	3.1W	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	000000
6	208/240V AC	7VA	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"	2.4"	3.4"	0.25"	UL Recognized Component, CSA Certified, CE Marked, UL 508	00000000	00000
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	00000
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	00000
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	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	00000

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

00000000

Each

0000000

Medium-Current 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

Hybrid Long-Life Medium-Current Relays

These relays combine solid state and mechanical operation to provide long service life without the need for a heat sink. Use with resistive heating loads; relays cannot be used with motor loads. An LED indicator tells you if the relay is open or closed.

Note: Relays cannot be used with an RC snubber.

							Wire Connection Type
Number of Terminals	Input Voltage	Control Power, VA	Switching Current @ Voltage	Ht.	Wd.	Dp.	Control Terminal	Load Terminal	Quick-Disconnect Tab Wd.	Specifications Met		Each
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
5	24V AC/3-24V DC	6.5	35 A @ 120 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	000000
5	24V AC/3-24V DC	6.5	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	00000
5	110-240V AC	6.5	35 A @ 120 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	00000
5	110-240V AC	6.5	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	00000
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
7	24V AC/3-24V DC	7.7	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	00000
7	110-240V AC	7.7	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	00000
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
9	24V AC/3-24V DC	8.9	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	000000
9	110-240V AC	8.9	35 A @ 240 V AC	3.8"	5.5"	1.9"	Quick-Disconnect	Screw Terminals	0.25"	UL Recognized Component, C-UL Recognized Component, CE Marked	000000	000000

Medium-Pressure Switches for Air Compressors

Switch

Switch With Air Exhaust Valve

For Use With: Air
Connection Material: Steel
Connection: NPT Female
Switching Current:
Polycarbonate Plastic: 24/24A
Steel Housing: 35/24A
Switching Voltage: 120V AC/240V AC

These switches meet pressure and electrical requirements of air compressors. They electrically activate automated controls or alarms when a set pressure is reached. Switches are double pole, single throw and normally closed (DPST-NC), so they switch two circuits from on to off.

Switches with air exhaust valve let you release the compressed air after use.