7A Switches | McMaster-Carr

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58 Products

About Electrical Switches

Choose a switch with the right trigger type, number of inputs, and control functions to power your equipment.

Mil. Spec. Washdown Toggle Switches

These switches meet MIL-S-3950. A rubber seal protects them from washdowns.

	No. of Terminals	Switch Designation	Position Designation	Switching Current @ Voltage	Max. Voltage	Dp. Behind Panel	Mounting Hardware Included	Wire Connection		Each
2 Positions







	For 1/2" Diameter Panel Cutouts

	1	1 Off	Momentary	2	SPST	Off-(On)	7 amp @ 125V AC, 10 amp @ 28V DC	28V DC 125V AC	1.16"	Yes	Screw Terminal	8002K123	000000


	1	1 Off or 1 On	Momentary	3	SPDT	On-(On)	7 amp @ 125V AC, 10 amp @ 28V DC	28V DC 125V AC	1.16"	Yes	Screw Terminal	8002K124	00000
	1	1 On	Momentary	2	SPST	On-(Off)	7 amp @ 125V AC, 10 amp @ 28V DC	28V DC 125V AC	1.16"	Yes	Screw Terminal	8002K121	00000


	3 Positions







					For 1/2" Diameter Panel Cutouts

					1	1 Off or 1 On	Momentary	3	SPDT	(On)-Off-On	7 amp @ 125V AC, 10 amp @ 28V DC	28V DC 125V AC	1.16"	Yes	Screw Terminal	8002K122	00000


					1	1 Off or 1 On	Momentary	3	SPDT	(On)-Off-(On)	7 amp @ 125V AC, 10 amp @ 28V DC	28V DC 125V AC	1.16"	Yes	Screw Terminal	8002K116	00000

Light Beam Finger-Touch Switches

An infrared light beam senses the lightest finger contact to switch a circuit on or off. The included guard prevents accidental activation. An indicator lights up to confirm that switches are actuated. They’re rated NEMA 4X, 13, and IP66 for protection from corrosion, washdowns, and oil/coolant spraying.

M22 Connection—Switches with a 5-pole M22 connection can quickly be changed out.

									Wire Leads
	No. of Circuits Controlled	Switch Starting Position	Switch Action	Switch Designation	Actuator Color	Switching Current @ Voltage	Input Voltage	Dp. Behind Panel	No. of	Ga.	Features		Each
Plastic Actuator with Wire Lead Connection







				For 30 mm (1 3/16") Diameter Panel Cutouts

				1	1 Off or 1 On	Momentary	SPDT	Black	7 amp @ 120V AC	120V AC	3/4"	5	22	Guard Output Indicator Power Indicator	72025K91	0000000


				1	1 Off or 1 On	Momentary	SPDT	Black	7 amp @ 120V AC	20V AC to 30V AC/20V DC to 30V DC	3/4"	5	22	Guard Output Indicator Power Indicator	72025K93	000000


				Plastic Actuator with 5-Pole M22 Connection







								For 30 mm (1 3/16") Diameter Panel Cutouts

								1	1 Off or 1 On	Momentary	SPDT	Black	7 amp @ 120V AC	120V AC	1 3/8"	—	—	Guard Output Indicator Power Indicator	72025K92	000000


								1	1 Off or 1 On	Momentary	SPDT	Black	7 amp @ 120V AC	20V AC to 30V AC/20V DC to 30V DC	1 3/8"	—	—	Guard Output Indicator Power Indicator	72025K11	000000

Accessories and Replacements for Finger-Touch Switches

		Each
Replacement Guard	72025K71	000000
5-Pole M22 Female Cable—12 ft.	69355K66	00000

3/4" Panel-Mount Key Switches

Wire Lead Connection

Prevent accidental activation and limit access—these switches require a key to turn circuits on or off. All fit into a standard panel cutout.

Keyed Alike—Keyed alike switches all open with the same key.

Keyed Differently—Keyed differently switches each open with a unique key.

Master Keyed—Keyed differently/master keyed switches are keyed differently but can be used with a master key (sold separately).

	Key Switches															Replacement Keys		Master Keys
										Wire Leads
	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Switch Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of	Lg.	No. of Keys Included	Key Removal Position		Each		Each		Each
2 Positions with Metal Actuator Base







				Keyed Alike with Wire Lead Connection

				1	1 Off	Momentary	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center	7188K101	000000	7188K104	00000	———	0


				1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center, Right	7188K22	00000	7188K62	0000	———	0




						Keyed Differently with Wire Lead Connection

						1	1 Off	Momentary	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center	7188K102	00000	7188K105	0000	———	0


						1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center, Right	7188K21	00000	7188K61	0000	———	0




								Keyed Differently/Master Keyed with Wire Lead Connection

								1	1 Off	Momentary	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center	7188K103	00000	———	0	7188K106	00000


								1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 1/8"	2	10"	2	Center, Right	7188K23	00000	———	0	7188K14	0000

High-Security 3/4" Panel-Mount Key Switches

With a round key that is difficult to duplicate, these switches provide a higher degree of security than standard key switches.

Keyed Alike—Keyed alike switches all open with the same key.

Keyed Differently—Keyed differently switches each open with a unique key.

Master Keyed—Keyed differently/master keyed switches are keyed differently but can be used with a master key (sold separately).

	Key Switches															Replacement Keys
										Wire Leads
	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Switch Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of	Lg.	No. of Keys Included	Key Removal Position		Each		Each
2 Positions with Metal Actuator Base







				Keyed Alike with Wire Lead Connection

				1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K26	000000	7188K31	000000




						Keyed Differently with Wire Lead Connection

						1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K25	00000	7188K51	00000




								Keyed Differently/Master Keyed with Wire Lead Connection

								1	1 Off	Maintained	2	SPST-NO	7 amp @ 28V AC/28V DC	28V AC 28V DC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K27	00000	———	0

Keys

		Each
Master Key	7188K18	000000

Easy-Grip Pendant Switches

Style F

With a slim shape, these switches fit comfortably in your hand. Use them with mobile machinery such as cranes, hoists, and trolleys.

Style F

	Switch Action	No. of Terminals per Actuator	Switching Current @ Voltage	Max. Voltage	Message (Actuator Color—Switch Designation)	Enclosure Rating		Each
1 Speed with Screw Terminals







	Yellow Plastic Housing

	2	1	1 Off or 1 On	Momentary	2	10 amp @ 120V AC 7 amp @ 24V DC	250V AC 28V DC	35 Assorted Labels (Black—SPDT)	IP67	7987K32	0000000

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. 4 Max. System Safety Rating—DIN-Rail Mount, Surface Mount

Image of Product. Front orientation. Contains Annotated. Safety Relays. Safety Relays, SIL 3, PLe, Cat. 4 Max. System Safety Rating—DIN-Rail Mount, 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

Easy-Hold Abrasive Blaster Safety Switches

Shown in Use

Reduce fatigue during long blasting sessions—these switches are built into a holder for your blaster hose. The holder has a brace that adjusts to shift most of the hose’s thrust away from your arms and grip, and repositions for comfort or different blasting angles. Switch easily between right- and left-hand use without having to take it apart. The housing has upper and lower rail mounts for optional accessories such as a side handle or flashlight (both sold separately). The mounts swivel around the clamp to keep accessories steady as the hose twists during blasting.

Also known as deadman switches, these switches stop blasting if you lose control. They automatically spring back to the off position to prevent injuries and reduce wasted material. To avoid accidental activation, a secondary safety lock requires an additional motion to begin blasting.

Electric

Trigger Actuator

These switches send an electric signal to the control panel on the blaster to stop the spray. Because the signal is electric, these switches respond quickly even when your hose is long. They're recommended for hose that's over 100-ft. long and required by OSHA standards for hose that's over 200-ft. long.

Actuator Style	For Hose OD	Switch Starting Position	No. of Terminals	Switch Designation	Switching Current @ Voltage	Max. Voltage, V DC	Housing Material	Electrical Connection Type	NEMA Type	Wd.	Lg.	Ht.	Features		Each
Trigger	1 3/16", 1 1/2", 1 7/8", 2 5/32"	1 Off	4	SPST	7 amp @ 12V DC 3 amp @ 24V DC	24	Plastic	Plug In	L5-15	5 1/4"	11 3/4"	13"	Adjustable Brace, Secondary Safety Lock, Upper and Lower Rail Mount	8816N11	0000000

Accessories and Replacements for Abrasive Blaster Safety Switches

Material	Lg.	Wd.		Each
Plastic	5"	1 1/4"	8816N13	0000000

Optional Flashlights


Shown Installed

Light cuts through dust to keep your work visible. These flashlights mount to the front of the rail so light follows your blast stream. Because the rail swivels, the light stays steady as the blast hose twists. A durable housing and a protective lens withstand contact from abrasive ricochet during blasting. When the lens wears, tear it off and replace it without any additional tools.

	Beam
Brightness, lm	Color	Pattern	Material	Wt., oz.	Electrical Connection Type	NEMA Type		Each
825	White	Spot	Plastic	13	Plug In	L5-15	8816N14	0000000