Hall Sensors | McMaster-Carr

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482 Products

Choosing a Proximity Switch

Magnetically Actuated Switches

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

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.

Circuit Board Magnetically Actuated Switches

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

Tamper-Resistant Magnetically Actuated Switches

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

Magnetic-Object Proximity Switches

Circuit Board DC Magnetic-Object
Proximity Switches

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

DC Magnetic-Object Proximity Switches

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

Metallic-Object Proximity Switches

Flat-Body DC Metallic-Object Proximity Switches

Easily mount these flat switches to a base or rail.

DC Metallic-Object Proximity Switches

These switches use DC input voltage and produce PNP or NPN signal output. They're often used with programmable logic controllers (PLCs).

Miniature DC Metallic-Object Proximity
Switches with Continuous-Flex Cable

The flexible cable on these switches withstands applications that require frequent motion, such as robotics.

Miniature DC Metallic-Object Proximity Switches

With a smaller diameter and shorter length than standard sized switches, these fit in the most space-constrained areas.

Extra-Short DC Metallic-Object Proximity Switches

The short body on these switches makes them suitable for tight spaces.

DC Metallic-Object Proximity
Switches for Long Distances

Sense objects from farther away than with other DC proximity switches that have the same diameter.

No-Distance-Correction DC
Metallic-Object Proximity Switches

Eliminate the need to calculate the sensing distance when using different metals—these switches sense all metal at the same distance. Also known as K=1 sensors.

Ring DC Metallic-Object Proximity Switches

Sense objects as they pass through the switch’s ring via tubing or a funnel. These switches are often used to monitor blockages, detect breaks in spooling wire, or count small metallic parts, such as screws, during the stamping process.

Rotatable DC Metallic-Object Proximity Switches

Turn the face on these switches to sense metallic objects from the front, sides, top, or bottom.

Hazardous Location Flat-Body DC
Metallic-Object Proximity Switches

Mount these intrinsically safe switches to flat surfaces in volatile areas. Their low-current, low-voltage NAMUR signal means they won’t ignite or create sparks while in use. ATEX and IECEx certified, they meet international standards to protect against explosion where combustible dust and flammable gases are present.

Slot DC Metallic-Object Proximity Switches

These inductive proximity switches sense metallic objects each time they pass through the slot, even when they’re obscured by water, oil, dirt, or a surface finish. Use them to measure the speed of rotating equipment and to count or detect moving objects, such as sheet metal being fed into a stamping process.

Hazardous Location DC
Metallic-Object Proximity Switches

Use these switches to sense metallic objects in environments containing flammable gases and combustible dust. ATEX and IECEx certified to protect against explosion, they produce a low-current, low-voltage NAMUR signal, so they won’t ignite or create sparks.

Hazardous Location Rotatable DC
Metallic-Object Proximity Switches

Twist the sensor to detect metallic objects where explosive dust or gas may be present—the sensor rotates for front, side, top, or bottom sensing. These switches are UL and C-UL listed as well as ATEX and IECEx certified for hazardous locations.

DC Metallic-Object Proximity
Switches for Robotic Welding

Check the position of your torch or workpiece for accuracy during robotic welding.

Hazardous Location Ring DC
Metallic-Object Proximity Switches

These intrinsically safe switches detect objects as they’re routed through the ring. They produce a low-current, low-voltage NAMUR signal, so they won’t ignite or create sparks. Switches are ATEX certified to protect against explosion.

Non-Ferrous DC Metallic-Object Proximity Switches

Detect aluminum cans, copper tubing, and other metal items that don’t contain iron.

Hazardous Location Slot DC
Metallic-Object Proximity Switches

For use in volatile areas, these intrinsically safe switches detect objects when they pass through the slot. They use a NAMUR signal to operate at a low current and voltage, so they won’t ignite or create sparks. ATEX and IECEx certified, they protect against explosion.

DC Metallic-Object Proximity
Switches with Digital Display

Actuate your switch with precision—these proximity switches have an easy-to-read screen for precise distance inputs, measurements, and troubleshooting.

Rotatable AC/DC Metallic-Object Proximity Switches

Rotate the face on these switches five different directions for easy installation and positioning—they work with both AC and DC inputs.

Flat-Body AC/DC Metallic-Object Proximity Switches

Mount these flat inductive switches to a base or rail to remotely detect metallic objects in wet and dirty environments.

AC/DC Metallic-Object Proximity Switches

Switches accept both AC and DC input voltage.

AC Metallic-Object Proximity
Switches for Long Distances

These switches have a longer sensing distance compared to other proximity switches with the same diameter.

AC Metallic-Object Proximity Switches

Most often found in older devices, these switches require AC input voltage.

Valve Position Switches

These switches sense when a valve is open or closed, supporting flow and temperature control within your system and offering reliable feedback.

Hazardous Location Valve Position Switches

Support flow and temperature control in your system with these intrinsically safe switches, which sense when a valve is open or closed in volatile areas. They are ATEX and IECEx certified to protect against explosion.

Magnetic Position-Measuring Transmitters

Continuously monitor your air cylinder rod’s position and turn the cylinder’s circuit on and off with a single component.

Tie Rod-Mount Proximity Switches for Sensor-Ready Hydraulic Cylinders

Tie Rod-Mount Proximity Switches for
Sensor-Ready Hydraulic Cylinders

Send an electronic signal to your system when the piston reaches a certain location.

Close-Proximity Audible Alarms

Magnetic-Contact Door Chimes

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

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.

Key-Controlled Door Alarms

Arm and disarm these alarms with a key.

Keypad-Controlled Door Alarms

Arm and disarm these alarms with a programmable code.