Interval Relays | McMaster-Carr

Control multiple timing functions from your electrical cabinet—these timer relays mount to 35 mm DIN rail (also known as DIN 3 rail), which is the most commonly used size.

Solid State Surface-Mount Timer Relays

Attach these relays to a flat surface using the mounting hole. They have no moving parts, so compared to mechanical switches, they require less maintenance, last longer, and are quieter.

Solid State DIN-Rail Mount
Multifunction Interface Timer Relays

Considered solid state because they don’t have any moving parts, these timer relays last longer, switch faster, and are quieter than mechanical relays. They interface between your controller and components to isolate input and output circuits, preventing damage to your components from voltage spikes, amplifying the relay's signal, and reducing signal interference. They have multiple timing functions, so you don’t need to swap out your relay if you want to change their function.

Solid State DIN-Rail Mount Timer Relays

Mount these timer relays directly to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. Unlike mechanical relays, they have no moving parts, so they require less maintenance and last longer, are quieter, and switch faster.

Solid State DIN-Rail Mount
Multifunction Timer Relays

For fast installation, mount these relays directly to 35 mm DIN rail (also known as DIN 3 rail). With no moving parts, these solid state relays last longer and require less maintenance, are quieter, and switch faster than mechanical relays.

DIN-Rail Mount Multifunction Interface Timer Relays

Protect components from voltage spikes while amplifying the relay’s signal and reducing interference for reliable transmission—these relays interface between your controller and system components to isolate the input and output circuits. They have multiple timing functions, so you don’t need to swap out your relay if you want to change their function.

Solid State Versa-Mount Multifunction Timer Relays

Install these relays in a panel cutout or plug them into a relay socket. Unlike mechanical relays, these solid state relays have no moving parts, so they require less maintenance and last longer, are quieter, and switch faster.

Multifunction Timer Relays

Get a variety of timing functions in a single relay.

Smart DIN-Rail Mount Multifunction Timer Relays

Whether installed in an electrical cabinet or hard-to-reach area, these timer relays are controlled remotely from your smartphone. They connect to your phone via a free downloadable app so you can set time delay ranges, adjust settings, and save programs.

Dual-Channel DIN-Rail Mount
Multifunction Timer Relays

Control two steps of an electrical process from a single relay—with two fully independent channels and 30 different functions, these relays give you a wide range of possibilities.

Solid State Versa-Mount Timer Relays

Mount these timer relays in a panel cutout or plug them into a relay socket for quick installation. Capable of fast switching, they are solid state and have no moving parts, so they require less maintenance, last longer, and are quieter than mechanical relays.

High-Starting-Current DIN-Rail Mount Timer Relays

Reduce voltage fluctuations and stress on shafts and bearings when starting up three-phase motors. These timer relays start with motor contacts in a star configuration, then switch to a delta configuration after a set delay.

Programmable Logic Controllers

End Plates for Programmable Logic Controllers

Used with PLCs, these end plates close off your system’s processes—telling the processor that there are no more inputs or outputs to communicate with. They also protect your modules’ circuitry from debris.

Input/Output Modules for
Programmable Logic Controllers

Connect switches, transmitters, actuators, and other equipment to your PLC for complex automation jobs.

Communication Modules for
Programmable Logic Controllers

Connect and communicate with multiple automation devices simultaneously, such as HMIs, motor speed controls, supervisory PCs, and additional PLC racks. These modules allow several systems to talk to one another—within your facility and beyond—letting you expand your automated processes over numerous interconnected networks.

Expansion Modules for
Programmable Logic Controllers

No need to program multiple PLCs—these modules expand your automated system, keeping everything conjoined and configured on one processor. Use them when you’re out of space on your DIN rail or need additional input/output functions.

Power Supplies for Programmable Logic Controllers

Designed for PLCs, these power supplies attach to your processor to bring your automated system to life. Once connected, they take in the voltage from your facility, convert and regulate it, and send out stabilized power to the rest of your equipment.

Open-Source Controllers

Combine the functionality of a PLC and the accessibility of a development board. Built around a Raspberry Pi and an Arduino-enabled microcontroller, these controllers use open-source software to make programming and troubleshooting convenient.

Compact Programmable Logic Controllers

Smaller than other PLCs, these controllers save space in your control cabinet. They combine the functionality of a relay, timer relay, and switch in one unit, so you can program simple automation jobs.

Easy-Program Logic Controllers

Design and operate up to six simultaneous programs without symbols or technical language—the on-screen instructions use simple English.

Circuit Board Relays

Smaller than relays with electrical wiring, these relays fit in compact devices. Mount them through holes on circuit boards with their solder pin terminals.

Timer Switches

Time-Delay Wall-Mount Timer Switches

Control two devices and delay the shut off of one device by up to one hour. These switches are often used with lights and fans for ventilation.

High-Current Wall-Mount Timer Switches

Control equipment with high currents such as air conditioners, heaters, and ventilation fans.

Wall-Mount Timer Switches

Use these switches in place of standard wall switches to automatically turn electrical equipment on or off after a set interval of time.

High-Visibility Timer Switches

The large face makes these switches easy to read from a distance.

Power-Saving Panel-Mount Timer Switches

Push and release the button to activate—no electricity required.

Timer Switches

Automatically turn electrical equipment on or off after a set interval.

Panel-Mount Timer Switches

Install these switches in a panel cutout to automatically turn electrical equipment on or off after a set interval.

Time and Day Activated Switches

Panel-Mount Set-to-the-Minute
Time and Day Activated Switches

Install these switches in a panel cutout.

High-Current Time and Day Activated Switches

Control equipment with high currents, such as landscape lighting, pumps, and heaters.

Outlet-Box-Mount Time and Day Activated Switches

Switches fit single device (1 gang) outlet boxes.

Outdoor High-Current Time
and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing.

Outdoor Set-to-the-Minute High-Current
Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing.

Set-to-the-Minute High-Current
Time and Day Activated Switches

For precise control of high-current equipment such as landscape lighting, pumps, and heaters, these switches schedule on/off times to the exact minute.

Surface/DIN-Rail Mount Time
and Day Activated Switches

Mount these switches to a flat surface or attach to DIN rail.

Panel-Mount Time and Day Activated Switches

Install these switches in a panel cutout.

Surface/DIN-Rail Mount Set-to-the-Minute
Time and Day Activated Switches

Mount these switches to a flat surface or attach to DIN rail.

Time and Day Activated Switches

Program these switches to turn a device on and off at a set time and day.

Smart Time and Day Activated Switches

Use your smart phone to turn equipment on and off at a set time and day.

Outdoor Time and Day Activated Switches

Designed to work with landscape and security lighting.

Hand-Held IO Link Programmers

Configure any of your IO Link devices—from sensors to switches—without a PC, outlet, or separate software.