Alarm Sensors | McMaster-Carr

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29 Products

Magnetic Contact Alarm Switches


Style A with Screw Terminals	Style A with Wire Leads	Style B

Style C	Style D

Wire contacts to an alarm system to alert when doors or windows are opened. Mount the magnet to the door or window and mount the switch to the frame. The alarm will activate when the magnet is pulled away by the opening door or window.

SPDT—SPDT switches connect to an alarm system and to another device, such as a motion detector.

	Switch Designation	Switching Current @ Voltage	Max. Sensing Distance	Wire Lead Lg., ft.	Lg.	Wd.	Ht.	Color	Environment	Enclosure Rating		Each
Plastic Housing with Screw Terminals







	Screw On with Sealed Housing

	A	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	0.75"	—	2.5"	0.56"	0.5"	Gray	Dusty, Wet	NEMA 1, IP62	8039A12	00000


	A	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	1.25"	—	3.93"	0.75"	0.62"	Gray	Dusty, Wet	NEMA 1, IP62	8073A11	00000
	A	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	1.25"	—	3.93"	0.75"	0.62"	White	Dusty, Wet	NEMA 1, IP62	8073A13	00000
	A	1	1 Off or 1 On	SPDT	0.25 amp @ 30V AC/30V DC	0.75"	—	2.5"	0.56"	0.5"	White	—	—	8039A47	00000
	A	1	1 Off or 1 On	SPDT	0.25 amp @ 30V AC/30V DC	1.25"	—	3.93"	0.75"	0.62"	White	—	—	8073A28	00000


	Plastic Housing with Wire Leads







					Adhesive Back with Sealed Housing

					A	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	0.62"	1	1.5"	0.25"	0.37"	White	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	8039A21	0000


					Aluminum Housing with Wire Leads







									Screw On with Flexible Stainless Steel Conduit and Sealed Housing

									A	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	3"	3	3"	0.5"	1"	—	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	8039A51	00000


									A	1	1 Off or 1 On	SPDT	0.25 amp @ 30V AC/30V DC	3"	3	3"	0.5"	1"	—	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	8039A52	00000
									B	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	3"	3	3.5"	1.5"	1.5"	—	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	8135A11	00000
									B	1	1 Off or 1 On	SPDT	0.25 amp @ 30V AC/30V DC	3"	3	3.5"	1.5"	1.5"	—	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	8135A32	00000
									C	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	6"	1 1/2	6.12"	0.5"	1"	—	—	—	80535A42	00000
									D	1	1 Off	SPST-NO	0.5 amp @ 100V AC/100V DC	3"	2	3.62"	0.68"	3"	—	Corrosive, Dusty, Oily, Outdoor, Submersible, Washdown, Wet	NEMA 4X, NEMA 6, NEMA 12, IP67	80425A31	00000

Magnetic-Contact-Sensor Door Chimes

No electricity or batteries are needed—as your door opens, the magnet and contact disc are separated, sounding a mechanical chime. The chime can be deactivated.

Volume			Overall
Control	(Sound) @ Distance	Power Source	Wd.	Ht.	Dp.	Material	Color	Sensor Type	For Use Outdoors	Mounting Profile	Mounting Fasteners Included		Each



	Fixed	88 dB @ 10 ft.	Mechanical	5 3/4"	2"	2 3/4"	Plastic	Brown	Magnetic Contact	No	Surface	Yes	8096A61	000000

Smart Magnetic Contact Alarm Switches

Use a free, downloadable app with these switches to automate alarms in your facility, such as sounding a buzzer if a trailer door is opened after a certain time. These switches link to your Wi-Fi network and push notifications to your smartphone. They have two parts: a magnet and a sensor. Mount each part to a surface—for instance, the magnet to a door and the sensor to the door frame—and the switch will send a signal when the magnet is pulled away.

	Wd.	Ht.	Color	Batteries Included	Mounting Fasteners Included	Features	Certification		Each
Plastic Housing







	Wi-Fi Connection

	0.5"	Android 6.0 or Later, iOS 11.0 or Later	1.6"	0.8"	2.8"	White	Yes	Yes	Indicating Light	ETL Listed, C-ETL Listed	7641N11	000000

Verbal Alarms

This alarm plays a recorded message when it detects someone passing within 6 _1/2 feet.

Volume			Overall									Batteries
Control	(Sound) @ Distance	Power Source	Wd.	Ht.	Dp.	Max. Recorded Message Lg., sec.	Material	Color	Control Type	Sensor Type	For Use Outdoors	Included	No. Req.	Size	Mobility		Each



	Fixed	Not Rated	Battery	2 1/2"	3 3/4"	1 1/4"	6	Plastic	Black	On/Off Switch	Light Beam	No	Yes	3	AA	Portable	1314A7	000000

Key-Controlled Door Alarms with Strobe Light

Attract more attention with a strobe light as well as an audible alarm. Arm and disarm these alarms with a key. They sound an alarm and emit short, intense bursts of light when a door is opened without authorization and the alarm and magnetic contact are separated. All require a mortise lock cylinder (sold separately) for operation.

Mount an rim lock cylinder (not included) on the opposite side of the door to arm and disarm these alarms from the outside.

			Overall							Mounting Location		Mounting
Volume (Sound) @ Distance	Volume Control	Sound Pattern	Wd.	Ht.	Dp.	Material	Appearance	For Use Outdoors	Batteries Included	Alarm	Contact	Profile	Fasteners Included		Each



	110 dBA @ 10 ft.	Fixed	Continuous, Pulse	2 1/2"	11"	2 3/8"	Aluminum	Dull	No	Yes	Door	Doorframe	Surface	Yes	1292A26	0000000

Lock Cylinders

Motion-Sensing Door Chimes

A chime announces when someone passes through the infrared light beam and a counter keeps track of each entrance and exit. Mount the transmitter and beam reflector between 2 and 20 feet apart. The chime's volume is adjustable up to 85 dB.

Cannot Be Sold to California—This chime cannot be sold to California due to local energy efficiency regulations.

	Chime			Transmitter			Beam Reflector		Volume
	Wd.	Ht.	Dp.	Wd.	Ht.	Dp.	Wd.	Ht.	Control	(Sound) @ Distance	Power Source	Material	Color	Sensor Type	For Use Outdoors	Mounting Profile	Mounting Fasteners Included	Includes	Cannot Be Sold To		Each
With 2-Blade Plugs



		3 3/4"	5"	1 1/2"	5"	2 3/4"	2 1/2"	4"	2"	Adjustable	85 dB @ 10 ft.	Electric	Plastic	White	Light Beam	No	Surface	Yes	26-ft. of 24 Gauge Wire, Beam Reflector, Chime, Plug-In Transformer, Transmitter	California	80405A18	0000000

Chimes

		Each
Additional Chime	80405A23	000000

Keypad-Controlled Door Alarms

Arm and disarm these alarms with a programmable code. They sound an alarm when a door is opened without authorization and the alarm and magnetic contact are separated.

Volume				Overall								Batteries			Mounting Location
Control	(Sound) @ Distance	Sound Pattern	Power Source	Wd.	Ht.	Dp.	Material	Color	Control Type	Combination Format	For Use Outdoors	Included	No. Req.	Size	Alarm	Contact	Mounting Profile	Mounting Fasteners Included	Features		Each



	Fixed	95 dBA @ 10 ft.	Continuous, Pulse	Battery	2 1/2"	9"	2 3/8"	Painted Aluminum	Dark Brown	Keypad	Five Numbers	No	Yes	1	9V	Door	Doorframe	Surface	Yes	LED Indicating Light	8108A47	0000000


	Fixed	95 dBA @ 10 ft.	Continuous, Pulse	Battery	2 1/2"	9"	2 3/8"	Aluminum	—	Keypad	Five Numbers	No	Yes	1	9V	Door	Doorframe	Surface	Yes	LED Indicating Light	8108A44	000000

Keypads

		Each
Exterior Keypad	8108A63	0000000

Quick-Stop Retracting Fall-Arrest Lanyards with Alarms

Like an alarm on your car dashboard, these lanyards flash and beep until you're clipped into fall protection on an order picker or other vehicle. They come with a Bluetooth sensor that pairs with the lanyard carabiner. Together they detect when you're onboard and clipped into the anchor point. Compatible with most order pickers, the sensor mounts to the cab of your vehicle and hooks into its wiring for power.

These lanyards extend and retract as you move around, but with a sudden jerk, such as a fall, they immediately lock like a seat belt to stop you. They stop your fall within inches, unlike shock-absorbing lanyards that extend several feet. A built-in shock absorber reduces the jolt of the stop. These lanyards are Class 1, so they work with D-rings that are at the same level as or below your anchor. When used together with an anchor and a harness, these lanyards help you meet OSHA and ANSI safety standards.

An RFID tag makes these lanyards easy to track during inventory and inspections.

Class 1

			Harness End Connection		Anchor End Connection
	Lg., ft.	Material	Hardware	Material	Hardware	Material	Carabiner Opening Wd.	Wt. Cap., lb.	Housing Material	Batteries Included	Specs. Met	Includes	Features		Each
1 Anchor End Connection







				Webbing

				6	UHMW Polyethylene	Carabiner with Swivel Eye	Aluminum	Carabiner with Swivel Eye	Steel	3/4", 13/16"	310	Plastic	Yes	ANSI/ASSP Z359.14, OSHA Compliant 29 CFR 1910.140, OSHA Compliant 29 CFR 1926.502	Bluetooth Sensor, Cable Ties, LED Light Strips, Sensor Power Cable with Wire Leads	Lightweight Hardware, RFID Tag	9366N101	000000000

Key-Controlled Door Alarms

Arm and disarm these alarms with a key. They sound an alarm when a door is opened without authorization and the alarm and magnetic contact are separated. All require a mortise lock cylinder (sold separately) for operation.

Mount a rim lock cylinder (not included) on the opposite side of the door to arm and disarm these alarms from the outside.

Volume				Overall								Batteries			Mounting Location
Control	(Sound) @ Distance	Sound Pattern	Power Source	Wd.	Ht.	Dp.	Material	Appearance	Color	Control Type	For Use Outdoors	Included	No. Req.	Size	Alarm	Contact	Mounting Profile	Mounting Fasteners Included	Features		Each



	Fixed	95 dBA @ 10 ft.	Continuous, Pulse	Battery	2 1/2"	9"	2 3/8"	Painted Aluminum	—	Dark Brown	Key	No	Yes	1	9V	Door	Doorframe	Surface	Yes	LED Indicating Light	8108A23	0000000


	Fixed	95 dBA @ 10 ft.	Continuous, Pulse	Battery	2 1/2"	9"	2 3/8"	Aluminum	Dull	—	Key	No	Yes	1	9V	Door	Doorframe	Surface	Yes	LED Indicating Light	8108A21	000000

Accessories and Replacements for Audible Alarms

Exterior Keypad—An exterior keypad allows the alarm to be armed and disarmed from the outside.

		Each
Required Mortise Lock Cylinder	1301A67	000000
Exterior Keypad	8108A63	000000
Replacement Locknut	1292A29	0000

Tamper-Resistant Magnetic Contact Alarm Switches


Flush Mount	Surface Mount	Surface Mount with Conduit Connection

Prevent unauthorized use of doors or windows with a combination of coded magnets and contacts that wire to an alarm system. The coded magnets mean they can’t be bypassed with regular magnets. These switches actuate when the magnet comes within sensing distance of the switch and reset when the magnet moves away. Mount the magnet to your door or window and the switch to the frame. Connect the switch contacts to an alarm system, which will trigger when the magnet is pulled away as your door or window is opened.

Flush Mount—Flush-mount switches are designed to mount against the door jam. They have a cord grip to reduce strain on your cord.

Surface Mount—Surface-mount switches mount on the surface of your door.

Conduit Trade Size 1/2—Switches with a _1/2 conduit connection are ready to directly attach to your conduit.

	Switching Current @ Voltage	Max. Sensing Distance	No. of Terminals	Conduit Trade Size	Lg.	Wd.	Ht.	Features	Enclosure Rating		Each
Painted Zinc Housing with Screw Terminals







	Screw On—Flush Mount

	2	1 Off and 1 On	DPST-1NO/1NC	0.2 amp @ 30V DC	0.26"	7	—	4.33"	1.38"	1.26"	Auxiliary NO (Normally Open) Alarm, Nickel-Plated Brass Cord Grip	IP67	7612N13	0000000




			Screw On—Surface Mount

			2	1 Off and 1 On	DPST-1NO/1NC	0.2 amp @ 30V DC	0.26"	7	—	2.96"	1.38"	1.34"	Auxiliary NO (Normally Open) Alarm	IP67	7612N12	000000


			2	1 Off and 1 On	DPST-1NO/1NC	0.2 amp @ 30V DC	0.26"	7	1/2	2.96"	1.38"	1.34"	Auxiliary NO (Normally Open) Alarm	IP67	7612N11	000000