Light Beam Curtains | McMaster-Carr

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55 Products

Choosing a Proximity Switch

Transmitter and Receiver

5-Pole
Micro
M12 Plug

8-Pole
Micro
M12 Plug

4-Pole
Micro
M12 Plug

Immediately cut power to machinery by breaking the light beam between two barriers. Light beams can travel up to 32 or 65 feet between the transmitter and receiver. They’re rated IP67, so they can be used in wet areas. For a complete switching system, combine a transmitter and receiver, safety relay, and connectors (all sold separately).

These switches can be configured for complex setups. To selectively allow material to pass through the sensing field, you can program the system to allow one or more beams to be broken without shutting off your machine. To create a perimeter guard that bends around corners, add mirrors to reflect light beams at an angle.

Note: These switches cannot be used with a full-revolution clutch press or machine. Use only with machinery that can consistently and immediately stop anywhere in its cycle.

Finger-Safe Transmitters and Receivers (IP67)

Finger Safe

Finger-safe switches trigger from objects the size of a finger passing through. Those with Bluetooth let you monitor switching status, beam alignment, and other data on your phone.

Swivel brackets can be adjusted during and after installation for easy alignment.

Switches
							Plug Type										Replacement Fixed Brackets			Swivel Brackets
Light Beam Ht.	Light Beam Switch Operation	Sensing Distance, ft.	Input Voltage	Current Output	Maximum Load Current	Signal Output Type	Transmitter	Receiver	Ht.	Wd.	Dp.	Housing Material	Color	Includes		Each	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
0.55" Minimum Object Size Detected
6.3"	On When Object Absent	1-32	24V DC	115mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	8.2"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K39	000000000	2	7774K64	000000	2	7774K62	0000000
9.4"	On When Object Absent	1-32	24V DC	120mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	11.3"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K41	00000000	2	7774K64	00000	2	7774K62	000000
12.6"	On When Object Absent	1-32	24V DC	130mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	14.5"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K43	00000000	2	7774K64	00000	2	7774K62	000000
15.7"	On When Object Absent	1-32	24V DC	140mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	17.6"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K44	00000000	2	7774K64	00000	2	7774K62	000000
18.9"	On When Object Absent	1-32	24V DC	130mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	20.8"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K42	00000000	2	7774K64	00000	2	7774K62	000000
22"	On When Object Absent	1-32	24V DC	135mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	23.9"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K45	00000000	2	7774K64	00000	2	7774K62	000000
28.3"	On When Object Absent	1-32	24V DC	150mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	30.2"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K46	00000000	2	7774K64	00000	2	7774K62	000000
34.6"	On When Object Absent	1-32	24V DC	160mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	36.5"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K47	00000000	2	7774K64	00000	2	7774K62	000000
47.2"	On When Object Absent	1-32	24V DC	190mA	300mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	49.1"	1.4"	1.4"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K48	00000000	2	7774K64	00000	2	7774K62	000000
0.55" Minimum Object Size Detected—Bluetooth
9.8"	On When Object Absent	10-32	24V DC	900mA	__	PNP	4-pole Micro M12	8-pole Micro M12	14.3"	1.1"	1.3"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K122	00000000	__	______	00	__	______	00
13"	On When Object Absent	10-32	24V DC	900mA	__	PNP	4-pole Micro M12	8-pole Micro M12	17.4"	1.1"	1.3"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K123	00000000	__	______	00	__	______	00
22.4"	On When Object Absent	10-32	24V DC	900mA	__	PNP	4-pole Micro M12	8-pole Micro M12	26.9"	1.1"	1.3"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K124	00000000	__	______	00	__	______	00
28.7"	On When Object Absent	10-32	24V DC	900mA	__	PNP	4-pole Micro M12	8-pole Micro M12	33.2"	1.1"	1.3"	Painted Aluminum	Yellow	Four Fixed Mounting Brackets	7774K125	00000000	__	______	00	__	______	00

Hand-Safe Transmitters and Receivers (IP67)

Hand Safe

Hand-safe switches trigger from objects the size of a hand passing through—but not slimmer objects such as a finger. For switches with a light beam height up to 9.4", you’ll need four fixed or two swivel brackets. For switches with a light beam height of 12.6" and greater, you’ll need four fixed or four swivel brackets.

Swivel brackets can be adjusted during and after installation for easy alignment.

Switches
						Plug Type									Fixed Brackets			Swivel Brackets
Light Beam Ht.	Light Beam Switch Operation	Sensing Distance, ft.	Input Voltage	Current Output	Signal Output Type	Transmitter	Receiver	Ht.	Wd.	Dp.	Housing Material	Color		Each	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
0.98" Minimum Object Size Detected
6.3"	On When Object Absent	1-65	24V DC	155mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	6.3"	1.3"	1.5"	Painted Aluminum	Yellow	7774K111	0000000	2	8690N15	000000	2	7774K121	0000000
9.4"	On When Object Absent	1-65	24V DC	160mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	9.4"	1.3"	1.5"	Painted Aluminum	Yellow	7774K112	000000	2	8690N15	00000	2	7774K121	000000
12.6"	On When Object Absent	1-65	24V DC	160mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	12.6"	1.3"	1.5"	Painted Aluminum	Yellow	7774K113	000000	2	8690N15	00000	2	7774K121	000000
15.7"	On When Object Absent	1-65	24V DC	160mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	15.7"	1.3"	1.5"	Painted Aluminum	Yellow	7774K114	000000	2	8690N15	00000	2	7774K121	000000
18.9"	On When Object Absent	1-65	24V DC	165mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	18.9"	1.3"	1.5"	Painted Aluminum	Yellow	7774K115	00000000	2	8690N15	00000	2	7774K121	000000
22"	On When Object Absent	1-65	24V DC	165mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	22"	1.3"	1.5"	Painted Aluminum	Yellow	7774K116	00000000	2	8690N15	00000	2	7774K121	000000
28.3"	On When Object Absent	1-65	24V DC	175mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	28.3"	1.3"	1.5"	Painted Aluminum	Yellow	7774K117	00000000	2	8690N15	00000	2	7774K121	000000
34.6"	On When Object Absent	1-65	24V DC	180mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	34.6"	1.3"	1.5"	Painted Aluminum	Yellow	7774K118	00000000	2	8690N15	00000	2	7774K121	000000
47.2"	On When Object Absent	1-65	24V DC	190mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	47.2"	1.3"	1.5"	Painted Aluminum	Yellow	7774K119	00000000	2	8690N15	00000	2	7774K121	000000

Safety Relays

Safety relays send a signal to shut off your machinery when the light beams are breached and restart when the issue is resolved. IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits. Mount them to 35 mm DIN rail (also known as DIN 3 Rail) for fast installation. These relays meet ISO and IEC standards for machine safety and can help achieve PL, SIL, or CAT system ratings.

2 Circuits Controlled with 2 Off (Normally Open)
Number of Terminals	Input Voltage	Switching Current @ Voltage	Maximum Switching Voltage	Wire Connection Type	Ht.	Wd.	Dp.	For Use With	Maximum System Safety Rating	Features		Each
14	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.69"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K73	0000000
4 Circuits Controlled with 4 Off (Normally Open)
18	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.89"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K76	000000

Transmitter Connectors

4-Pole
Micro
M12 Socket

5-Pole
Micro
M12 Socket

No. of Poles	Gender	Wire Connection Type	Cable Lead Lg., ft.		Each
4	Female	Wire Leads	12	6897K36	000000
5	Female	Wire Leads	32 1/2	7774K52	00000

Receiver Connectors

8-Pole
Micro
M12 Socket

No. of Poles	Gender	Wire Connection Type	Cable Lead Lg., ft.		Each
8	Female	Wire Leads	32 1/2	7774K51	0000000

Receiver Extension Cords

8-Pole
Micro
M12 Socket

8-Pole
Micro
M12 Plug

No. of Poles	Gender	Cable Lead Lg., ft.		Each
8	Female × Male	9 1/2	7774K55	000000

Transmitter and Receiver Connecting Cords

5-Pole
Micro
M12 Socket

8-Pole
Micro
M12 Socket

Transmitter and receiver connecting cords link multiple safety barrier switches in a row. They include one cord to connect two transmitters, and one cord to connect two receivers.

No. of Poles	Gender	No. of Cords	Cable Lead Lg.		Each
5, 8	Female	2	8"	7774K57	0000000

Floor Stands

Floor stands shield transmitters and receivers from accidental impact.

For Maximum Light Beam Ht.	Ht.	Wd.		Each
34.6"	52.5"	4.3"	8886N17	0000000
47.2"	84"	4.3"	8886N18	000000

Light Beam Safety Barrier Switches for Long Distances

Spanning up to 230 ft.—roughly the length of a commercial airplane—these safety barrier switches cut power to large machinery to prevent damage or injury. They trigger the instant a person or object crosses the light beams between the transmitter and receiver. To selectively allow material to pass through the sensing field, you can program the system to allow one or more beams to be broken without shutting off your machine. To create a perimeter guard that bends around corners, add mirrors to reflect light beams at an angle. Rated IP67, these switches withstand wet conditions.

For a complete switching system, combine a transmitter and receiver, safety relay, and connectors (all sold separately).

Note: These switches cannot be used with a full-revolution clutch press or machine. Use only with machinery that can consistently and immediately stop anywhere in its cycle.

Transmitter and receiver connecting cords link multiple safety barrier switches in a row. They include one cord to connect two transmitters, and one cord to connect two receivers.

All switches require four fixed or four swivel brackets. Swivel brackets can be adjusted during and after installation for easy alignment. Swivel brackets also allow you to use floor stands, which shield transmitters and receivers from impact.

Transmitters and Receivers—IP67

						Plug Type
Light Beam Ht.	Light Beam Switch Operation	Sensing Distance, ft.	Input Voltage	Current Output	Signal Output Type	Transmitter	Receiver	Ht.	Wd.	Dp.	Housing Material	Color	Cable Lg., ft.		Each
Body Safe
11.8" Minimum Object Size Detected
35.4"	On When Object Absent	1-230	24V DC	140mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	42.1"	1.3"	1.5"	Painted Aluminum	Yellow	1	8690N13	000000000
15.7" Minimum Object Size Detected
31.5"	On When Object Absent	1-230	24V DC	130mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	38.2"	1.3"	1.5"	Painted Aluminum	Yellow	1	8690N12	00000000
47.2"	On When Object Absent	1-230	24V DC	140mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	53.9"	1.3"	1.5"	Painted Aluminum	Yellow	1	8690N14	00000000
19.7" Minimum Object Size Detected
19.7"	On When Object Absent	1-230	24V DC	120mA	PNP/NPN	5-pole Micro M12	8-pole Micro M12	26.4"	1.3"	1.5"	Painted Aluminum	Yellow	1	8690N11	00000000

Safety Relays

2 Circuits Controlled with 2 Off (Normally Open)
Number of Terminals	Input Voltage	Switching Current @ Voltage	Maximum Switching Voltage	Wire Connection Type	Ht.	Wd.	Dp.	For Use With	Maximum System Safety Rating	Features		Each
14	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.69"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K73	0000000
4 Circuits Controlled with 4 Off (Normally Open)
18	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.89"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K76	000000

Transmitter Connectors

5-Pole
Micro
M12 Female

No. of Poles	Gender	Wire Connection Type	Cable Lead Lg., ft.		Each
5	Female	Wire Leads	32 1/2	7774K52	000000

Receiver Connectors

8-Pole
Micro
M12 Female

No. of Poles	Gender	Wire Connection Type	Cable Lead Lg., ft.		Each
8	Female	Wire Leads	32 1/2	7774K51	0000000

Receiver Extension Cords

8-Pole
Micro
M12 Female

8-Pole
Micro
M12 Male

No. of Poles	Gender	Cable Lead Lg., ft.		Each
8	Female × Male	9 1/2	7774K55	000000

Transmitter and Receiver Connecting Cords

5-Pole
Micro
M12 Female

8-Pole
Micro
M12 Female

No. of Poles	Gender	No. of Cords	Cable Lead Lg.		Each
5, 8	Female	2	8"	7774K57	0000000

Brackets

Fixed

Swivel

Bracket Movement	Pkg. Qty.		Pkg.
Fixed	2	8690N15	000000
Swivel	2	7774K121	000000

Floor Stands

For Maximum Light Beam Ht.	Ht.	Wd.		Each
34.6"	52.5"	4.3"	8886N17	0000000
47.2"	84"	4.3"	8886N18	000000

Harsh Environment Light Beam Safety Barrier Switches

Shut off machinery on your roughest, dirtiest job sites the second someone or something gets too close. Shielded by a polycarbonate housing, these safety barrier switches withstand impact better than standard models. Rated IP69, they’re sealed to keep out dust and high-pressure, high-temperature washdowns, so they'll stand up to mud, water, and heat on site. They're often used in construction zones and mining operations. When conditions are too harsh for inspections, use Bluetooth to send diagnostics to your phone. Simply connect to the app to monitor switching status, beam alignment, and other data from afar.

These switches trigger when the light beams between the transmitter and receiver are interrupted. To selectively allow material to pass through the sensing field, you can program the system to allow one or more beams to be broken without shutting off your machine. To create a perimeter guard that bends around corners, add mirrors to reflect light beams at an angle.

For a complete switching system, combine a transmitter and receiver, which are sold together, with a safety relay (sold separately).

Note: These switches cannot be used with a full-revolution clutch press or machine. Use only with machinery that can consistently and immediately stop anywhere in its cycle.

Finger-safe switches trigger from objects the size of a finger passing through. Hand-safe switches trigger from objects the size of a hand passing through.

Transmitters and Receivers—IP69

Transmitter and Receiver

Finger Safe

Hand Safe

4-Pole
Micro
M12 Plug

5-Pole
Micro
M12 Plug

						Plug Type
Light Beam Ht.	Light Beam Switch Operation	Sensing Distance, ft.	Input Voltage	Current Output	Signal Output Type	Transmitter	Receiver	Ht.	Wd.	Dp.	Housing Material	Color	Includes	Cable Lg., ft.		Each
Finger Safe (0.55" Minimum Object Size Detected)
13"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	18.1"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N11	000000000
19.3"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	24.4"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N13	00000000
25.6"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	30.7"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N15	00000000
28.7"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	33.9"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N17	00000000
35"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	40.2"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N19	00000000
38.2"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	43.3"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N22	00000000
47.6"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	52.8"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N24	00000000
53.9"	On When Object Absent	1-23	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	59.1"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N26	00000000
Hand Safe (1.18" Minimum Object Size Detected)
13"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	18.1"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N12	00000000
19.3"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	24.4"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N14	00000000
25.6"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	30.7"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N16	00000000
28.7"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	33.9"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N18	00000000
35"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	40.2"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N21	00000000
38.2"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	43.3"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N23	00000000
47.6"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	52.8"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N25	00000000
53.9"	On When Object Absent	1-32	24V DC	700mA	PNP	4-pole Micro M12	5-pole Micro M12	59.1"	2.4"	2.4"	Polycarbonate Plastic	Yellow	Four Fixed Mounting Brackets	33	8403N27	00000000

Safety Relays

2 Circuits Controlled with 2 Off (Normally Open)
Number of Terminals	Input Voltage	Switching Current @ Voltage	Maximum Switching Voltage	Wire Connection Type	Ht.	Wd.	Dp.	For Use With	Maximum System Safety Rating	Features		Each
14	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.69"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K73	0000000
4 Circuits Controlled with 4 Off (Normally Open)
18	24V DC	2 A @ 240 V AC, 1.5 A @ 24 V DC	250V AC	Terminal Block	4.9"	0.89"	4.3"	Emergency Stops, Light Curtains	PLe, SIL3, CAT 4, 250V	Auxiliary PNP Output, LED Indicator	7774K76	000000