7A Relays | McMaster-Carr

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24 Products

DIN-Rail Mount Interface Relays

Isolate input and output circuits to prevent damage from voltage spikes, reduce signal interference, and amplify signal. These relays interface between your controller and components—they receive a signal from the controller to switch power on or off to the components. All have an LED indicator that shows you if your switch is actuated, so you know it’s connected and wired correctly. Use them to communicate signals to devices like motors or sensors. Mount them on 35 mm DIN rail (also known as DIN 3 rail).

4 Circuits Controlled with 4 Off or 4 On—4PDT


With Screw Terminals	With Spring-Clamp Terminals

With Spring-Clamp Terminals—Relays with spring-clamp terminals connect and disconnect to wires without needing to turn screws. Because there is no screw, these connections have less risk of loosening over time than screw terminals, even when there is vibration.

PLC Output Protection—Relays with PLC output protection prevent voltage spikes created by the relay from damaging the output channel on your programmable logic controller (PLC).

	Interface Relays												Replacement Relays
	No. of Terminals	Input Voltage	Control Current, mA	Switching Current @ Voltage	Max. Switching Voltage, V AC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Features		Each		Each
With Screw Terminals



		14	24V AC	53	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N109	000000	4144N124	000000


		14	120V AC	12	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N111	00000	4144N125	00000
		14	12V DC	86	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N113	00000	4144N127	00000
		14	24V DC	40	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N112	00000	4144N126	00000


		With Spring-Clamp Terminals



				14	24V AC	53	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N118	00000	4144N124	00000


				14	12V DC	86	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N121	00000	4144N127	00000
				14	24V DC	40	7 amp @ 240V AC	250	1/8 hp @ 120V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N119	00000	4144N126	00000

Solid State Screw Terminal Relays


1-Circuit Relay with Covered Terminals and LED Indicator	1-Circuit Relay with LED Indicator	1-Circuit Relay with Covered Terminals

1-Circuit Relay	Heat Sinks

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

Relays with High-Starting-Current Protection—Relays with high-starting-current protection are designed with integrated circuits that prevent damage from the large burst of electricity when a device, such as a motor or pump, turns on.

LED Indicator—Relays with LED indicator let you quickly spot whether a relay is on or off.

Heat Sinks—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 or a thermal pad should be placed between the heat sink and relay. Silicone compound is sold separately for heat sinks that do not include it but require it. Two-circuit relays don’t require silicone for mounting.

	Relays										Heat Sinks		Silicone Compounds
			Switching Current @ Voltage
	No. of Terminals	Input Voltage	Without Heat Sink	With Heat Sink, amp	Max. Switching Voltage, V AC	Ht.	Wd.	Dp.		Each		Each		Each
1 Circuit Controlled with 1 Off—SPST-NO







				Relays with High-Starting-Current Protection

				4	85V AC, 120V AC, 240V AC, 280V AC	7 amp @ 120V AC	25	140	2.3"	1.8"	1"	7456K17	000000	7456K222	000000	10405K79	000000


				4	85V AC, 120V AC, 240V AC, 280V AC	7 amp @ 240V AC	25	280	2.3"	1.8"	1"	7456K23	00000	7456K222	00000	10405K79	00000
				4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7 amp @ 120V AC	25	140	2.3"	1.8"	1"	7456K21	00000	7456K222	00000	10405K79	00000
				4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7 amp @ 240V AC	25	280	2.3"	1.8"	1"	7456K25	00000	7456K222	00000	10405K79	00000
				4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7 amp @ 380V AC	25	420	2.3"	1.8"	1"	7456K132	00000	7456K222	00000	10405K79	00000




						Relays with High-Starting-Current Protection and Covered Terminals and LED Indicator

						4	120V AC, 240V AC	7 amp @ 240V AC	75	240	2.3"	1.8"	1.1"	7456K66	000000	7456K69	000000	10405K79	00000


						4	120V AC, 240V AC	7 amp @ 240V AC	90	240	2.3"	1.8"	1.1"	7456K67	000000	7456K69	000000	10405K79	00000




								Relays with High-Starting-Current Protection and LED Indicator

								4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7 amp @ 240V AC	25	280	2.3"	1.8"	1"	7456K27	00000	7456K222	00000	10405K79	00000

Safety Relays

Receive signals from safety monitoring relays or controllers to switch devices off and on because of a system failure. Also known as force-guided or mechanically linked contacts, the interlocking opposing contacts on these relays cannot be open or closed at the same time. To keep your system from receiving false switching signals, the interlocking opposing contact must remain open even if a contact welds closed.

IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits. These relays have been tested to safety standards that can help you achieve your system's PL (performance level) and SIL (safety integrity level). Choose a relay with a PL and SIL rating to meet the needs of your system. Higher ratings indicate greater safety protection. As your system becomes more complex, you generally require a higher safety protection level. Mount them to 35mm DIN rail (also known as DIN 3 Rail).

SIL 3, PLe, CAT IV, 600V Max. System Safety Rating—DIN-Rail and Surface Mount

Image of Product. Front orientation. Contains Annotated. Safety Relays. Safety Relays, SIL 3, PLe, CAT IV, 600V Max. System Safety Rating—DIN-Rail and Surface Mount.

Relays that meet SIL 3 are tested for applications with a probability of failure of 0.01% to 0.1% and are used for preventing fires, explosions, or toxic releases.

Relays that meet CAT 4 withstand circuit surges in electrical applications up to 600V.

Mirror Auxiliary Contacts—Relays with mirror auxiliary contacts have contacts that are normally closed and cannot be open at the same time as a normally open main contact.

Nondetachable Auxiliary Contacts—Relays with nondetachable contacts have auxiliary contacts that won’t separate from the relay if there is shock or vibration.

Self-Monitoring Circuitry—When a failure is detected, relays with self-monitoring circuitry signal the controller to remove power and prevent restarting until the issue is resolved.

						hp @ Switching Voltage
	No. of Terminals	Input Voltage	Control Current, mA	Switching Current @ Voltage	Max. Switching Voltage, V AC	Single Phase	Three Phase	Aux. Contact Switch Starting Position	Ht.	Wd.	Dp.	Features		Each
Screw-Terminal Wire Connection







				3 Circuits Controlled with 3 Off—3PST-NO

				18	120V AC	2	7 amp @ 400V AC	600	1/4 hp @ 120V AC 1 hp @ 240V AC	2 hp @ 240V AC 3 hp @ 480V AC 5 hp @ 600V AC	2 Off and 3 On	2.7"	1.8"	4.6"	Inspection Window, Interlocked Opposing Contacts, Mirror Auxiliary Contacts, Nondetachable Auxiliary Contacts, Recessed Terminals, Self-Monitoring Circuitry	6242N11	0000000


				18	24V DC	12	7 amp @ 400V AC	600	1/4 hp @ 120V AC 1 hp @ 240V AC	2 hp @ 240V AC 3 hp @ 480V AC 5 hp @ 600V AC	2 Off and 3 On	2.7"	1.8"	4.6"	Inspection Window, Interlocked Opposing Contacts, Mirror Auxiliary Contacts, Nondetachable Auxiliary Contacts, Recessed Terminals, Self-Monitoring Circuitry	6242N15	000000