Magnetic Door Contacts | McMaster-Carr

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121 Products

Choosing an Electrical Switch

Magnetic Contact Alarm Switches

Wire contacts to an alarm system to alert when doors or windows are opened.

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.

Tamper-Resistant Magnetic Contact Alarm Switches

Prevent unauthorized use of doors or windows with a combination of coded magnets and contacts that wire to an alarm system.

Magnetically Actuated Switches

These switches actuate when a magnet comes within sensing distance, and reset when the magnet moves away.

Tamper-Resistant Magnetically Actuated Switches

Prevent unauthorized use—these switches require coded magnets to actuate. They cannot be bypassed using ordinary magnets.

Circuit Board Magnetically Actuated Switches

Mounted to your circuit board, these switches trigger when magnetic components get near, and reset as they move away.

DC Magnetic-Object Proximity Switches

These switches detect magnetic objects—or objects with a magnet attached—through non-magnetic walls.

Circuit Board DC Magnetic-Object
Proximity Switches

Send signals in response to changing magnetic fields to trigger processes or monitor position, speed, and current.

Door Alarms

Key-Controlled Door Alarms

Arm and disarm these alarms with a key.

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.

Keypad-Controlled Door Alarms

Arm and disarm these alarms with a programmable code.

Keyed Cam Locks

Electronic Status-Indicating
Square-Drive Cam Locks

Trigger a light, alarm, or other device to signal your door is unlocked.

Electronic Status-Indicating Slotted-Drive Cam Locks

Trigger a light, alarm, or other device to signal your door is unlocked.

Electronic Status-Indicating
Triangle-Drive Cam Locks

Trigger a light, alarm, or other device to signal your door is unlocked.