Medium-Amp Relays | McMaster-Carr

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80 Products

Solid State Screw Terminal Relays

1-Circuit Relay

1-Circuit Relay with Covered Terminals

1-Circuit Relay with
Covered Terminals
and LED Indicator

1-Circuit Relay with LED Indicator

2-Circuit Relay

Heat Sink

With no moving parts, these solid-state relays are fast switching and require less maintenance, last longer, and are quieter than mechanical switches.

IP20 rated relays prevent fingers and other objects from touching live circuits.

Heat sinks disperse heat to increase the relay’s current rating. Mount them to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. They also mount to flat surfaces. Before mounting one-circuit relays, silicone compound should be applied between the heat sink and relay. Silicone is sold separately for 75A and 90A one-circuit relays. Two-circuit relays don’t require silicone for mounting.

Relays
		Switching Current										Heat Sinks		Silicone Compounds
Number of Terminals	Input Voltage	Without Heat Sink	With Heat Sink	Switching Voltage	Max. Switching Voltage	Ht.	Wd.	Dp.	Environmental Rating		Each		Each		Each
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
Relays
4	5V DC, 6V DC, 12V DC, 24V DC, 48V DC, 60V DC	2A	3A	60V DC	60V DC	2.3"	1.8"	0.8"	__	0000000	000000	0000000	0000000	000000	00
4	5V DC, 6V DC, 12V DC, 24V DC, 48V DC, 60V DC	2A	5A	60V DC	60V DC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
Relays with High-Starting-Current Protection
4	70V AC, 120V AC, 140V AC	7.5A	25A	300V AC	300V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	000000	00
4	85V AC, 120V AC, 240V AC, 280V AC	7A	25A	120V AC	140V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	85V AC, 120V AC, 240V AC, 280V AC	7A	25A	240V AC	280V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	85V AC, 120V AC, 240V AC, 280V AC	11A	45A	240V AC	280V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	12V AC, 24V AC, 3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7.5A	25A	300V AC	300V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	120V AC	140V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	240V AC	280V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	11A	45A	120V AC	140V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	11A	45A	240V AC	280V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
Relays with High-Starting-Current Protection and Covered Terminals
4	24V AC, 48V AC, 120V AC, 240V AC, 24V DC, 48V DC	2.5A	25A	240V AC	265V AC	2.3"	1.8"	1.1"	IP20	0000000	00000	0000000	000000	000000	00
4	24V AC, 48V AC, 120V AC, 240V AC, 24V DC, 48V DC	2.5A	50A	240V AC	265V AC	2.3"	1.8"	1.1"	IP20	0000000	00000	0000000	00000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	2.5A	25A	240V AC	265V AC	2.3"	1.8"	1.1"	IP20	0000000	00000	0000000	000000	000000	00
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	2.5A	50A	240V AC	265V AC	2.3"	1.8"	1.1"	IP20	0000000	00000	0000000	00000	000000	00
Relays with High-Starting-Current Protection and Covered Terminals and LED Indicator
4	120V AC, 240V AC	7A	75A	240V AC	240V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	00000000	000000
4	120V AC, 240V AC	7A	90A	240V AC	240V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	00000000	00000
Relays with High-Starting-Current Protection and LED Indicator
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	240V AC	280V AC	2.3"	1.8"	1"	__	0000000	00000	0000000	000000	000000	00
1 Circuit Controlled with 1 On (Normally Closed)—SPST-NC
Relays with High-Starting-Current Protection
4	70V AC, 120V AC, 140V AC	7.5A	25A	300V AC	300V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	000000	00
4	12V AC, 24V AC, 3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7.5A	25A	300V AC	300V AC	2.3"	1.8"	1.1"	__	0000000	000000	0000000	000000	000000	00
2 Circuit Controlled with 2 Off (Normally Open)—DPST-NO
Relays with High-Starting-Current Protection and Covered Terminals and LED Indicator
6	4V DC, 6V DC, 12V DC, 24V DC, 30V DC	5A	50A	600V AC	660V AC	2.3"	1.8"	1.3"	IP20	0000000	000000	0000000	000000	000000	00
6	4V DC, 6V DC, 12V DC, 24V DC, 30V DC	7.5A	75A	600V AC	660V AC	2.3"	1.8"	1.3"	IP20	0000000	000000	0000000	000000	000000	00
2 Circuit Controlled with 2 Off (Normally Open)—SPST-NO
Relays with High-Starting-Current Protection and Covered Terminals and LED Indicator
8	4V DC, 6V DC, 12V DC, 24V DC, 30V DC	5A	50A	600V AC	660V AC	2.3"	1.8"	1.3"	IP20	0000000	000000	0000000	000000	000000	00

Open-Style Relays

1 Circuit

2 Circuits

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											Optional Covers
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ Voltage	Max. Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.		Each		Each
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
4	24V AC	396	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	000000	0000000	000000
4	120V AC	79	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
4	240V AC	40	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
4	12V DC	167	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
4	24V DC	83	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
1 Circuit Controlled with 1 Off (Normally Open) or 1 On (Normally Closed)—SPDT
5	24V AC	396	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
5	120V AC	79	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
5	240V AC	40	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
5	12V DC	167	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
5	24V DC	83	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
6	24V AC	396	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
6	120V AC	79	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
6	240V AC	40	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
6	12V DC	167	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
6	24V DC	83	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	2.5"	2.5"	2.2"	0000000	00000	0000000	00000
2 Circuits Controlled with 2 Off (Normally Open) or 2 On (Normally Closed)—DPDT
8	24V AC	396	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.3"	2.5"	2.4"	0000000	00000	0000000	00000
8	120V AC	79	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.3"	2.5"	2.4"	0000000	00000	0000000	00000
8	240V AC	40	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.3"	2.5"	2.4"	0000000	00000	0000000	00000
8	12V DC	167	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.3"	2.5"	2.4"	0000000	00000	0000000	00000
8	24V DC	83	30 A @ 120 V AC/24 V DC	132V AC/26V DC	1 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.3"	2.5"	2.4"	0000000	00000	0000000	00000
4 Circuits Controlled with 4 Off (Normally Open) or 4 On (Normally Closed)—4PDT
14	120V AC	116	35 A @ 120 V AC 20 A @ 24 V DC	120V AC	1 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3.4"	2.7"	2.7"	0000000	000000	0000000	00000

DIN-Rail Mount Solid State Relays

Relay with Integrated Heat Sink

Unlike mechanical relays, these solid state relays have no moving parts, so they require less maintenance and last longer, switch faster, and are quieter. They mount on 35 mm DIN rail (also known as DIN 3) for fast installation. IP20 rated, their terminals are recessed, so they prevent fingers and other objects from touching live circuits.

Relays with an integrated heat sink disperse heat to increase the relay’s current rating.

Relays with an integrated fan are best for applications that generate more heat. The fan automatically turns on to provide additional cooling. When the temperature exceeds 176° F, an alarm sends a signal to an external device, such as a controller or indicating light.

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 Current, mA	Switching Current @ Voltage (Load Type)	Max. Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.	Features		Each
Single Phase
4	90V AC, 120V AC, 240V AC, 280V AC	12	4.5 A @ 24 V AC (Full Load) 8 A @ 24 V AC (Resistive Load) 10 A @ 24 V AC	600V AC	__	3.5"	0.7"	2.6"	Integrated Heat Sink, LED Indicator	0000000	0000000
4	24V AC, 120V AC, 208V AC, 240V AC, 277V AC, 24V DC, 48V DC, 60V DC, 120V DC	13	20 A @ 240 V AC (Full Load)	264V AC	1/3 hp @ 115 V AC 1 hp @ 230 V AC	4.3"	0.7"	4.1"	Integrated Heat Sink, LED Indicator	0000000	00000
4	24V AC, 120V AC, 208V AC, 240V AC, 277V AC, 24V DC, 48V DC, 60V DC, 120V DC	13	30 A @ 230 V AC (Full Load)	264V AC	3/4 hp @ 115 V AC 2 hp @ 230 V AC	4.2"	0.9"	5.4"	Integrated Heat Sink, LED Indicator	0000000	000000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	11	20 A @ 240 V AC (Full Load)	264V AC	1/3 hp @ 115 V AC 1 hp @ 230 V AC	4.3"	0.7"	4.1"	Integrated Heat Sink, LED Indicator	0000000	00000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	11	30 A @ 230 V AC (Full Load)	264V AC	3/4 hp @ 115 V AC 2 hp @ 230.000 V AC	4.2"	0.9"	5.4"	Integrated Heat Sink, LED Indicator	0000000	000000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	30	4.5 A @ 24 V AC (Full Load) 8 A @ 24 V AC (Resistive Load) 10 A @ 24 V AC	600V AC	__	3.5"	0.7"	2.6"	Integrated Heat Sink, LED Indicator	0000000	000000
4	4V DC, 6V DC, 12V DC, 24V DC, 30V DC	12	4.5 A @ 24 V AC (Full Load) 8 A @ 24 V AC (Resistive Load) 8 A @ 3 V DC	150V DC	__	3.5"	0.7"	2.6"	Integrated Heat Sink, LED Indicator	0000000	00000
4	24V DC	18	15 A @ 24 V DC (Resistive Load)	32V DC	__	3.5"	0.7"	2.4"	LED Indicator	0000000	00000
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
Two Phase
6	24V AC, 120V AC, 208V AC, 240V AC, 277V AC, 24V DC, 48V DC, 60V DC, 120V DC	2	25 A @ 220 V AC (Full Load)	242V AC	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	4.3"	2.1"	4"	Integrated Heat Sink, LED Indicator	0000000	000000
6	24V AC, 120V AC, 208V AC, 240V AC, 277V AC, 24V DC, 48V DC, 60V DC, 120V DC	2	25 A @ 600 V AC (Full Load)	660V AC	5 hp @ 230 V AC 10 hp @ 480 V AC	4.3"	2.1"	4"	Integrated Heat Sink, LED Indicator	0000000	000000
6	5V DC, 6V DC, 12V DC, 24V DC, 30V DC	10	25 A @ 220 V AC (Full Load)	242V AC	1 1/2 hp @ 115 V AC 3 hp @ 230 V AC	4.3"	2.1"	4"	Integrated Heat Sink, LED Indicator	0000000	000000
6	5V DC, 6V DC, 12V DC, 24V DC, 30V DC	10	25 A @ 600 V AC (Full Load)	660V AC	5 hp @ 230 V AC 10 hp @ 480 V AC	4.3"	2.1"	4"	Integrated Heat Sink, LED Indicator	0000000	000000

Spade-Terminal Relays

Surface Mount

Using a low-current signal, these relays are often used to control small motors and heaters. These relays attach to quick-disconnect terminals.

Surface-mount relays have a slot on the flange for mounting them to flat surfaces.

1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ Voltage	Maximum Switching Voltage	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each
Surface Mount
4	24V AC	71	30 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	000000
4	120V AC	20	30 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
4	240V AC	10	30 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
2 Circuits Controlled with 2 Off (Normally Open)—DPST-NO
Surface Mount
6	24V AC	71	25 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
6	120V AC	20	25 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
6	240V AC	10	25 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
6	12V DC	158	25 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000
6	24V DC	79	25 A @ 240 V AC	250V AC	1.3"	2.7"	1.9"	0.25"	0000000	00000

Screw Terminal Relays

Use the screw terminals to hardwire these relays. The built-in enclosure protects contacts from dust and dirt. These relays accept voltage drops up to 50% of the rated voltage without switching. They’re often used with industrial automation systems, security and emergency lighting, and small motors. Also known as power relays.

			Switching Current @ Voltage
Number of Terminals	Input Voltage	Control Current, mA	Off (Normally Open) Circuit Position	On (Normally Closed) Circuit Position	Maximum Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.		Each
4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC
10	120V AC	22	25 A @ 240 V AC/24 V DC	8 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	000000
10	24V DC	83	25 A @ 240 V AC/24 V DC	8 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
4 Circuits Controlled with 3 Off (Normally Open) and 1 On (Normally Closed)—4PST-3NO/1NC
10	120V AC	22	25 A @ 240 V AC/24 V DC	8 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
10	24V DC	83	25 A @ 240 V AC/24 V DC	8 A @ 240 V AC/24 V DC	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
4 Circuits Controlled with 4 Off (Normally Open)—4PST-NO
10	120V AC	22	25 A @ 240 V AC/24 V DC	__	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
10	240V AC	11	25 A @ 240 V AC/24 V DC	__	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000
10	24V DC	83	25 A @ 240 V AC/24 V DC	__	250V AC	1 1/2 hp @ 120 V AC 3 hp @ 240 V AC 3 hp @ 277 V AC	1.4"	2"	2.5"	0000000	00000