1 Off Limit Switches | McMaster-Carr

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267 Products

Choosing a Proximity Switch

Panel-Mount Sealed Wet-Location Limit Switches

Sealed actuators prevent these switches from jamming, even when exposed to oil, sand, mud, or ice.

Snap-Acting Switches

Open and close circuits in a snap. These switches actuate quickly to minimize arcing and prevent contacts from sticking.

Harsh Environment Snap-Acting Switches

Open and close circuits in a snap—even in harsh conditions. With a rubber-encased housing and stainless steel bracket, these switches handle high vibrations and resist corrosion. They’re rated IP68 for protection from dust and temporary submersion.

Mil. Spec. Washdown Snap-Acting Switches

Keep out dirt and moisture—the sealed housing on these switches is watertight and meets MIL-PRF-8805.

Subminiature Snap-Acting Switches

At least 25% smaller than our Miniature Snap-Acting Switches, these switches are often used to trigger actions from inside a vehicle’s door or an engine compartment.

Subminiature Wet-Location Snap-Acting Switches

Built for tight spaces exposed to water, these switches have a housing that's less than 1" long and IP67 rated for protection from temporary submersion.

Light-Touch Miniature Snap-Acting Switches

Smaller and more sensitive than standard snap-acting switches, these switches fit in tight spaces and actuate from light pressure.

Miniature Snap-Acting Switches

Smaller than standard snap-acting switches, these switches trigger actions in tight spaces. They’re used in components as small as computer mice and engine restart switches.

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).

Flat-Body DC Metallic-Object Proximity Switches

Easily mount these flat switches to a base or rail.

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.

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.

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.

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.

Rotatable DC Metallic-Object Proximity Switches

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

Miniature Flat-Body DC
Metallic-Object Proximity Switches

About half the length of our other flat-body proximity switches, these switches fit in crowded spaces and along rails.

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.

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.

DC Universal-Object Proximity Switches

Often used with programmable logic controllers (PLCs), these switches use DC input voltage and produce PNP or NPN signal output.

Hazardous Location DC
Universal-Object Proximity Switches

These switches use a NAMUR signal to operate at a low current and voltage, so they won’t ignite or produce sparks. ATEX certified, they protect against explosion in environments containing flammable gases and combustible dust. Switches sense both metallic and nonmetallic objects.

AC/DC Universal-Object Proximity Switches

Switches accept both AC and DC input voltage.

Tilt Switches

Often used as position indicators, pump level controls, and machine limit switches, these switches actuate when tilted to a certain angle.

Circuit Board Magnetically Actuated Switches

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

Air-Actuated Foot Switches

Press these switches with your foot for convenient, hands-free operation.

Speed-Monitoring Switches

Detect unwanted slowdowns in your rotary shaft that could cause machine damage and downtime.

Snap-Action Thermostats

Also known as snap discs, these thermostats switch on cooling systems or switch off heating systems when equipment gets too hot.