Relays | McMaster-Carr

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C-UL Listed

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Yes

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Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

REACH

Operating Voltage

1,709 Products

Electrical Power, Networking, and Controlling

Relays

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

366 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

48 products

Relay Sockets

Quickly mount relays to DIN rail or flat surfaces

26 products

Timer Relays

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

202 products

Latching Relays

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

27 products

Vehicle Relays

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

36 products

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

PLCs

Program complex automation jobs by combining the functionality of a relay, timer relay, and switch

77 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

IO Link Programmers

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

1 product

Motor Starter Overload Protectors

Upgrade your motor starter protector to use less energy and emit less heat

8 products

Safety Relays

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

60 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

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Alternating Relays

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

1 product

Air-Actuated Relays

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

1 product

Foot Switches

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

1 product

Push-Button Switches

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

1 product

Transfer Switches

Switch to backup power during an outage

7 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

1 product

Relay Contacts

Replace contacts on your relay

47 products

Transistors

Boost weak electrical signals and rapidly control data transmission

20 products

Backup Power Supplies

Transfer power to a built-in battery during partial and complete outages

3 products

Fluid Handling

Float Switch Relays

Amplify current to actuate equipment that has a higher current rating than your float switch

2 products