7A Switches | McMaster-Carr

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54 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.

2 Position
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Position Designation	Switching Current @ Voltage	Max. Voltage	Dp. Behind Panel	Mounting Hardware Included	Wire Connection Type		Each
For 1/2" Panel Cutout Dia.
1	1 Off (Normally Open)	Springs Back (Momentary)	2	SPST	Off-(On)	7 A @ 125 V AC, 10 A @ 28 V DC	28V DC 125V AC	1.16"	Yes	Screw Terminals	8002K123	000000
1	1 On (Normally Closed)	Springs Back (Momentary)	2	SPST	On-(Off)	7 A @ 125 V AC, 10 A @ 28 V DC	28V DC 125V AC	1.16"	Yes	Screw Terminals	8002K121	00000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	3	SPDT	On-(On)	7 A @ 125 V AC, 10 A @ 28 V DC	28V DC 125V AC	1.16"	Yes	Screw Terminals	8002K124	00000
3 Position
For 1/2" Panel Cutout Dia.
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	3	SPDT	(On)-Off-(On)	7 A @ 125 V AC, 10 A @ 28 V DC	28V DC 125V AC	1.16"	Yes	Screw Terminals	8002K116	00000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	3	SPDT	(On)-Off-On	7 A @ 125 V AC, 10 A @ 28 V DC	28V DC 125V AC	1.16"	Yes	Screw Terminals	8002K122	00000

Easy-Grip Pendant Switches

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

Style C can be wired to prevent both buttons from operating simultaneously.

Easy-Grip Pendant Switches

1 Speed with Screw Terminals
Style	No. of Buttons	No. of Circuits Controlled per Actuator	Switch Starting Position	Switch Action	No. of Terminals per Actuator	Switching Current @ Voltage	Max. Voltage	Message (Actuator Color—Industry Designation)	Housing Material		Each
IP67
F	2	1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	2	10 A @ 120 V AC, 7 A @ 24 V DC	28V DC 250V AC	35 Assorted Labels (Black—SPDT)	Yellow Plastic	7987K32	0000000

3/4" Panel-Mount Key Switches

With Wire Leads

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 switches all open with the same key.

Keyed differently switches each open with a unique key.

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

Switches													Replacement Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Key Removal Position		Each		Each
2 Position with Metal Base
Keyed Alike with Wire Leads
1	1 Off (Normally Open)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	7188K101	000000	7188K104	00000
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	7188K22	00000	7188K62	0000
Keyed Differently with Wire Leads
1	1 Off (Normally Open)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	7188K102	00000	7188K105	0000
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	7188K21	00000	7188K61	0000

Switches													Master Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of Keys Included	Key Removal Position		Each		Each
2 Position with Metal Base
Keyed Differently/Master Keyed with Wire Leads
1	1 Off (Normally Open)	Springs Back (Momentary)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center	7188K103	000000	7188K106	00000
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 1/8"	2	Center, Right	7188K23	00000	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 switches all open with the same key.

Keyed differently switches each open with a unique key.

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

Switches
									Wire Leads			Key			Replacement Keys
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Dia.	Dp. Behind Panel	No. of	Lg.	No. of Keys Included	Removal Position		Each		Each
2 Position with Metal Base
Keyed Alike with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K26	000000	7188K31	000000
Keyed Differently with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K25	00000	7188K51	00000
Keyed Differently/Master Keyed with Wire Leads
1	1 Off (Normally Open)	Stays Switched (Maintained)	2	SPST-NO	7 A @ 28 V DC/28 V AC	28V DC 28V AC	7/8"	1 3/16"	2	10"	2	Center, Right	7188K27	00000	______	00

Master Key

7188K18

Each

000000

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.

Switches with a 5-pole mini plug can quickly be changed out.

								Wire Leads
No. of Circuits Controlled	Switch Starting Position	Switch Action	Industry Designation	Actuator Color	Switching Current @ Voltage	Input Voltage	Dp. Behind Panel	No. of	Ga.	Features		Each
Plastic Actuator with Wire Leads
For 30 mm Panel Cutout Dia.
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	SPDT	Black	7 A @ 120 V AC	120V AC	3/4"	5	22	Guard Output Indicator Power Indicator	72025K91	0000000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	SPDT	Black	7 A @ 120 V AC	20V AC-30V AC/20V DC-30V DC	3/4"	5	22	Guard Output Indicator Power Indicator	72025K93	000000
Plastic Actuator with 5-Pole Mini Plug
For 30 mm Panel Cutout Dia.
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	SPDT	Black	7 A @ 120 V AC	120V AC	1 3/8"	__	__	Guard Output Indicator Power Indicator	72025K92	000000
1	1 Off (Normally Open) or 1 On (Normally Closed)	Springs Back (Momentary)	SPDT	Black	7 A @ 120 V AC	20V AC-30V AC/20V DC-30V DC	1 3/8"	__	__	Guard Output Indicator Power Indicator	72025K11	000000

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

DIN-Rail Mount Interface Relays

2 and 4 Circuits with Spring-Clamp Terminals

3 and 4 Circuits with Screw Terminals

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).

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.

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

Relays with Relay Sockets											Replacement Relays
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ 240V AC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Features		Each		Each
4 Circuits Controlled with 4 Off (Normally Open) or 4 On (Normally Closed)—4PDT
With Screw Terminals
14	24V AC	53	7A	1/8 hp @ 120 V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N109	000000	4144N124	000000
14	120V AC	12	7A	1/8 hp @ 120 V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N111	00000	4144N125	00000
14	12V DC	86	7A	1/8 hp @ 120 V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N113	00000	4144N127	00000
14	24V DC	40	7A	1/8 hp @ 120 V AC	3.1"	1.1"	3.3"	LED Indicator, PLC Output Protection	4144N112	00000	4144N126	00000
With Spring-Clamp Terminals
14	24V AC	53	7A	1/8 hp @ 120 V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N118	00000	4144N124	00000
14	12V DC	86	7A	1/8 hp @ 120 V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N121	00000	4144N127	00000
14	24V DC	40	7A	1/8 hp @ 120 V AC	3.9"	1.2"	3.3"	LED Indicator, PLC Output Protection	4144N119	00000	4144N126	00000

Solid State Screw Terminal Relays

1-Circuit Relay

1-Circuit Relay with
Covered Terminals
and LED Indicator

1-Circuit Relay with LED Indicator

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.

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.

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

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
		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.		Each		Each		Each
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO
Relays with High-Starting-Current Protection
4	85V AC, 120V AC, 240V AC, 280V AC	7A	25A	120V AC	140V AC	2.3"	1.8"	1"	7456K17	000000	7456K222	000000	10405K79	000000
4	85V AC, 120V AC, 240V AC, 280V AC	7A	25A	240V AC	280V AC	2.3"	1.8"	1"	7456K23	00000	7456K222	00000	10405K79	00000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	380V AC	420V AC	2.3"	1.8"	1"	7456K132	00000	7456K222	00000	10405K79	00000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	120V AC	140V AC	2.3"	1.8"	1"	7456K21	00000	7456K222	00000	10405K79	00000
4	3V DC, 6V DC, 12V DC, 24V DC, 30V DC	7A	25A	240V AC	280V AC	2.3"	1.8"	1"	7456K25	00000	7456K222	00000	10405K79	00000
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"	7456K66	000000	7456K69	000000	10405K79	00000
4	120V AC, 240V AC	7A	90A	240V AC	240V AC	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	7A	25A	240V AC	280V AC	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).

Relays that meet SIL3 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.

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

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

SIL3, PLe, CAT 4, 600V Max. System Safety Rating

					hp @ Switching Voltage
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ Voltage	Max. Switching Voltage	Single Phase	Three Phase	Auxiliary Contact Switch Starting Position	Ht.	Wd.	Dp.	Features		Each
With Screw Terminals—DIN-Rail and Surface Mount
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO
18	120V AC	2	7 A @ 400 V AC	600V AC	1/4 hp @ 120 V AC 1 hp @ 240 V AC	2 hp @ 240 V AC 3 hp @ 480 V AC 5 hp @ 600 V AC	2 Off (Normally Open) or 3 On (Normally Closed)	2.7"	1.8"	4.6"	Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window	6242N11	0000000
18	24V DC	12	7 A @ 400 V AC	600V AC	1/4 hp @ 120 V AC 1 hp @ 240 V AC	2 hp @ 240 V AC 3 hp @ 480 V AC 5 hp @ 600 V AC	2 Off (Normally Open) or 3 On (Normally Closed)	2.7"	1.8"	4.6"	Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window	6242N15	000000