Safety Sensors | McMaster-Carr

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2,574 Products

Electrical Power, Networking, and Controlling

Magnetic Switches

Actuate when a magnet comes within sensing distance; often used to detect when doors or windows open

120 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

59 products

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

263 products

Bumper Switches

Signal when overhead doors close or items reach the end of conveyors

16 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

44 products

Proximity Sensors

Detect the presence or position of objects from a short sensing distance

428 products

Limit Switches

Turn equipment on or off when objects touch the actuator; often used for conveyors and bin filling

23 products

Ultrasonic Sensors

Measure the distance to objects and the level of liquids and materials

21 products

Proximity Sensor Safety Barriers

Safely send power to sensors in volatile areas such as refineries and power plants

2 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

8 products

Switch Padding

Trigger an emergency stop when robot arms contact a worker or object

4 products

Switch Mats

Step on a mat to actuate circuits, often to control doors, lights, and alarms

32 products

Foot Switches

Step on the pedal to actuate circuits while keeping your hands free for other tasks

4 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

260 products

Switch Contact Blocks

Mount to switches to control electrical circuits as you move the switch

4 products

Emergency Stop Switches

Cut power to equipment during emergencies

190 products

Push-Button Switches

Our most common switch type actuates circuits with the push of a button

2 products

Enclosure Door Switches

Control fans, lights, and other devices inside your enclosure when you open and close the door

2 products

Automatic Door Switches

Doors open when you touch a button or the switches detect motion

18 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

7 products

Transfer Switches

Switch to backup power during an outage

7 products

Enabling Switches

Equipment only runs while you press the switch; also known as deadman switches

18 products

Pendant Switches

Control machinery, such as cranes, hoists, and trolleys, from a safe distance

1 product

Battery Switches

Turn the knob to alternate between two batteries without interrupting power

1 product

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

414 products

Safety Relays

Monitor circuits and force machines to a safe stop if the relay detects a fault

64 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

79 products

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Vehicle Relays

Switch high-current loads on vehicles, such as starters, headlights, and fuel pumps

47 products

Latching Relays

Lock into position so they don't require constant voltage to stay switched

29 products

Monitoring Relays

Trip circuits or sound an alarm when voltage, current, or other limits are exceeded

31 products

Infrequent-Cycle Relays

Use with equipment that cycles on and off, such as HVAC systems

147 products

Air-Actuated Relays

Convert an air signal on a pneumatic control system to an electric one

1 product

Alternating Relays

Automatically split run time between two devices so one isn't always running

2 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Fusible Link Switches

Use as a safety switch to shut off hydraulic equipment and other machinery when the link melts

10 products

Safety Equipment

Multi-Gas Detectors

Monitor air for carbon monoxide and combustible gases including methane, hydrogen, and propane

8 products

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

3 products

Carbon Dioxide Meters

Measure and display real-time carbon dioxide levels for indoor ventilation quality

1 product

Heat Stress Monitors

Measure temperature, humidity, and radiant heat to keep people safe from heat-related hazards

9 products

Hydrogen Detectors

Alarms and lights alert you to the presence of hydrogen

4 products

Propane Detectors

Alarms and lights alert you to the presence of propane instantly or after a set exposure time

1 product

Methane Detectors

Alarms and lights alert you to the presence of methane instantly or after a set exposure time

1 product

Carbon Monoxide Detectors

Alarms, lights, or color changes alert you to the presence of carbon monoxide

8 products

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

6 products

Respirator Filter Monitors

Track the quality of incoming air as it travels from your air line to your respirator

6 products

Smoke Detector Test Stations

Test hard-to-reach HVAC smoke detectors from a convenient location

1 product

Fall-Arrest Lanyards

Clip to your harness and an anchor to stop you from hitting the ground if you fall

1 product

Smoke Detectors

Warn people when there's smoke in your facility

21 products

Heat Detectors

Signal your control panel when the temperature rises above a set level

5 products

Fire Alarms

Alert people to fires with loud warnings

44 products

Communication

Legend Plates

Mark switches and lights on control panels for easy identification

15 products

Labels

Stick onto items to identify or convey information about them

1 product

Measuring and Inspecting

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

13 products

Fabricating and Machining

Abrasive Blaster Safety Switches

Shut off abrasive blasters if the operator loses control; also known as deadman switches

11 products

Fluid Handling

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

8 products

Facility and Grounds Maintenance

Mirrors

View your reflection or deflect beams from safety barrier switches for a perimeter around machinery

10 products

Building and Machinery Hardware

T-Slotted Framing Switches

Attach to your rail to actuate components or cut power

10 products