90A Switches | McMaster-Carr

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31 Products

Infrequent-Cycle 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.

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.		Each
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
With Quick-Disconnect and Screw Terminals
4	24V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	0000000
4	24V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
4	120V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	000000
4	120V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
4	24V DC	5.1W	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
4	208V AC, 240V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	000000
4	208V AC, 240V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
With Quick-Disconnect and Screw Terminals
6	24V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	000000
6	24V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
6	120V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	000000
6	120V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
6	24V DC	5.1W	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000
6	208V AC, 240V AC	19VA	90A	120A	7 1/2 hp @ 115 V AC 20 hp @ 230 V AC	30 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	5"	3.7"	4.4"	0.25"	00000000	000000
6	208V AC, 240V AC	50.4VA	75A	90A	5 hp @ 115 V AC 15 hp @ 230 V AC	20 hp @ 230 V AC 50 hp @ 460 V AC 50 hp @ 575 V AC	3.8"	2.6"	4"	0.25"	00000000	000000

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. Mount them directly to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. They have recessed terminals that prevent fingers and other objects from touching live circuits. You can wire the control circuit on either side of the relay, which helps you use less wire.

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

Use replacement coils to swap out a broken coil or change the input voltage of a relay. The full load current of the relay must match the full load current range of the coil.

10 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
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
10	24V AC	15VA	70A	90A	600V AC	5 hp @ 120 V AC 15 hp @ 240 V AC	25 hp @ 240 V AC 50 hp @ 480 V AC 50 hp @ 600 V AC	5.4"	2.2"	4.5"	00000000	0000000
10	120V AC	15VA	70A	90A	600V AC	5 hp @ 120 V AC 15 hp @ 240 V AC	25 hp @ 240 V AC 50 hp @ 480 V AC 50 hp @ 600 V AC	5.4"	2.2"	4.5"	00000000	000000
10	240V AC	15VA	70A	90A	600V AC	5 hp @ 120 V AC 15 hp @ 240 V AC	25 hp @ 240 V AC 50 hp @ 480 V AC 50 hp @ 600 V AC	5.4"	2.2"	4.5"	00000000	000000

Auxiliary Contacts

Front-Mount Auxiliary Contact

Number of Circuits Controlled	For Relay Width	Switch Starting Position	Industry Designation	Mounting Location		Each
2	1.8", 2.2", 2.4"	2 Off (Normally Open)	DPST-NO	Front	0000000	000000
2	1.8", 2.2", 2.4"	2 On (Normally Closed)	DPST-NC	Front	0000000	00000
2	1.8", 2.4"	1 Off (Normally Open) and 1 On (Normally Closed)	DPST-1NO/1NC	Front	00000000	00000
4	1.8", 2.2", 2.4"	1 Off (Normally Open) and 3 On (Normally Closed)	4PST-1NO/3NC	Front	0000000	00000
4	1.8", 2.2", 2.4"	2 Off (Normally Open) and 2 On (Normally Closed)	4PST-2NO/2NC	Front	0000000	00000
4	1.8", 2.2", 2.4"	3 Off (Normally Open) and 1 On (Normally Closed)	4PST-3NO/1NC	Front	0000000	00000
4	1.8", 2.2", 2.4"	4 Off (Normally Open)	4PST-NO	Front	0000000	00000
4	1.8", 2.2", 2.4"	4 On (Normally Closed)	4PST-NC	Front	0000000	00000

Replacement Coils

For Switching Current (Load Type)	Input Voltage	Input Frequency, Hz		Each
22A-32A (Full Load)	24V AC	60	0000000	000000
22A-32A (Full Load)	120V AC	60	0000000	00000
22A-32A (Full Load)	240V AC	60	0000000	00000
70A-80A (Full Load)	24V AC	60	0000000	00000
70A-80A (Full Load)	120V AC	60	0000000	00000
70A-80A (Full Load)	240V AC	60	0000000	00000