Metric Switches | McMaster-Carr

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1/2" Circular Connector

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EAR99

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1,482 Products

Electrical Power, Networking, and Controlling

Lever Switches

Grip and twist the lever to turn circuits on and off, preventing accidental actuation

66 products

Emergency Stop Switches

Cut power to equipment during emergencies

59 products

Proximity Sensors

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

393 products

Rotary Switches

Control multiple devices with a single switch

6 products

Key Switches

Turn a key to actuate circuits, preventing accidental start and limiting access

15 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

15 products

Photoelectric Sensors

Detect objects from longer distances than proximity and ultrasonic sensors

211 products

Safety Switches

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

10 products

Doorbell Switches

Activate doorbells or buzzers with the push of a button

1 product

Ethernet Switches

Expand your data network by connecting computers, printers, and servers

37 products

Proximity Sensor Safety Barriers

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

2 products

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

4 products

Switch Padding

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

4 products

Ultrasonic Sensors

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

20 products

Cylinder Position Sensors

Monitor your air cylinder rod's position and turn the cylinder on and off

2 products

IO-Link Programmers

Configure your IO-Link devices without a PC, outlet, or separate software

1 product

Potentiometers

Control speed, volume, and light intensity by varying electrical flow; also known as rheostats

1 product

Relays

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

93 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

60 products

Monitoring Relays

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

5 products

Timer Relays

Turn machinery on or off after receiving an electrical signal that starts the timer

2 products

Safety Relays

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

8 products

Circuit Breakers

Reusable way to interrupt circuits when they overload or short

220 products

Data Connection Hubs

Add USB, DisplayPort, or HDMI ports to your computer to connect multiple device

10 products

Strain-Relief Connector Boots

Protect connectors and cords from strain, bends, and pulls

1 product

Fluid Handling

Pressure Switches

Activate controls, set off alarms, and power equipment when a set pressure is reached

9 products

Directional Control Valves

Manage the flow of fluids to move equipment in air- and hydraulic-powered systems

25 products

Flow Switches

Turn equipment on or off when flow rate reaches a set point

4 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

2 products

Air-Exhaust Valves

Vent or divert exhaust to speed up the operation of air cylinders, actuators, and other equipment

5 products

Temperature Controllers

Precisely regulate process temperatures; more accurate than temperature switches

6 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

3 products

Flow Transmitters

Send flow rate measurements to PLCs, data loggers, and remote displays

12 products

Building and Machinery Hardware

Brackets

Connect surfaces in an assembly

64 products

Indicating Knobs

Control devices and view settings at a glance

6 products

Measuring and Inspecting

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

3 products

Communication

RFID Readers

Read RFID cards when prototyping systems or scan RFID tags to control circuits

8 products

Power Transmission

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

12 products