Motor Relays | McMaster-Carr

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1,000 Products

Relays

DIN-Rail Mount Touch-Safe Screw Terminal Relays

Quickly and safely mount these relays on 35 mm DIN rail (also known as DIN 3). IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits.

DIN-Rail Mount Solid State Relays

Unlike mechanical relays, these solid state relays have no moving parts, so they require less maintenance and last longer, switch faster, and are quieter. They mount on 35 mm DIN rail (also known as DIN 3) for fast installation.

DIN-Rail Mount Interface Relays

Isolate input and output circuits to prevent damage from voltage spikes, reduce signal interference, and amplify signal.

Spade-Terminal Relays

Using a low-current signal, these relays are often used to control small motors and heaters.

Thin Spade-Terminal Relays

Save space in your control cabinet. These narrow relays are often used for low-current switching applications, such as on small motors and pilot lights.

Screw Terminal Relays

Use the screw terminals to hardwire these relays.

Open-Style Screw Terminal Relays

Use these relays with industrial automation systems, security and emergency lighting, and small motors.

Infrequent-Cycle Relays

For use with equipment that cycles on and off, these relays meet UL 508 for air conditioning and heating. Also known as definite-purpose contactors.

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.

Circular-Pin Relays

The circular pin terminals plug into relay sockets for easy installation.

Washdown Enclosed Relays

A NEMA 4X enclosure protects these relays from washdowns, dirt, and corrosion.

Enclosed Relays

An enclosure covers the terminals on these relays to help prevent damage from dust or accidental bumps.

Hazardous Location Relays

Sealed for safety, these relays are a good choice for hazardous locations where combustible or corrosive gases may be present.

Touch-Safe DIN-Rail Mount Infrequent-Cycle Relays

Operate equipment that cycles on and off from your control cabinet.

Sequenced Latching Relays

These relays switch through a series of different circuit configurations every time they receive an input voltage. Also known as step relays.

Latching Relays

A single, momentary input voltage switches these relays and locks them in position, so they don't require a constant input voltage to stay on or off.

Analog-Input Proportional-Control Relays

Often used to regulate the speed of AC fans or keep a heater at a set temperature, these relays connect directly to sensors to calculate and adjust output power. This allows you to use an analog input without converting it to a digital signal to control output power.

Circuit Board Safety Relays

Reduce connection errors on circuit boards that control machine guards and other safety devices. These relays take up less space on a board than those with electrical wiring because their solder pin terminals mount directly through circuit board holes.

Interface Safety Relays

These relays pair the transmission reliability of an interface relay with the fail-safe operation of a safety relay. They have interlocking contacts—also known as force-guided or mechanically linked contacts—so opposing contacts won't close at the same time.

Alternating Relays

Split run time between two devices—these relays automatically alternate between them.

Smart Multifunction Monitoring Relays

Remotely control these relays through an app on your smartphone—they simultaneously monitor phase, voltage, and frequency.

Motor Control Switches

Motor Starters

Provide on/off control for a motor and protect it from overloads. These starters shut the motor off if current exceeds the full-load current rating.

Low-Profile Motor Starters

With a shallower depth than most other starters, these fit in narrow spaces.

Enclosed Motor Starters

The NEMA 4X rated enclosure protects these starters from corrosion and washdowns.

Compact Enclosed Motor Starters

Sized to fit in tight spaces, these starters have a shorter height and narrower depth than most other starters.

Reversing Motor Starters

Use these starters with motors that run forward and backward, such as motors for conveyor belts.

Enclosed Reversing Motor Starters

Rated NEMA 4X, these enclosed starters are protected from corrosion and washdowns.

Energy-Saving Motor Starters

Save electricity and extend motor life by reducing the motor's starting current.

Heavy Duty Motor Starters

Sealed coils protect these switches against moisture, heat, dirt, and mechanical and thermal stress.

Enclosed Heavy Duty Motor Starters

Housed in a durable steel enclosure.

Manual Motor Starters

Operated by hand, these starters are more compact than electrically actuated motor starters; use them when multiple motor circuits are housed in one panel.

Build-Your-Own Manual Motor Starters

Assemble your own motor starter by combining a switch and a thermal overload element.

Heavy Duty Build-Your-Own Manual Motor Starters

Combine a switch and a thermal overload element to build a starter that can handle high-current-rated motors. Also known as a NEMA starter.

Enclosed Heavy Duty Build-Your-Own
Manual Motor Starters

Housed in a durable steel enclosure.

DIN-Rail Mount Motor Voltage Monitors

Mount these monitors to DIN rail.

Surface-Mount Motor Voltage Monitors

Use the mounting holes to attach monitors to a flat surface.

Socket-Mount Motor Voltage Monitors

Plug monitors into relay sockets for fast installation and replacement.

Overload Protectors for Motor Starters

Upgrade motor starters that use thermal overload protection with these solid-state overloads—they don't use heating elements, so enclosure ventilation and cooling is not required.

Timer 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.

Timer Relays

Turn machinery, such as paint and conveyor lines, on and off after a set period of time.

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.

Relays

DIN-Rail Mount Touch-Safe Screw Terminal Relays

DIN-Rail Mount Solid State Relays

DIN-Rail Mount Interface Relays

Spade-Terminal Relays

Thin Spade-Terminal Relays

Screw Terminal Relays

Open-Style Screw Terminal Relays

Infrequent-Cycle Relays

Circuit Board Relays

Circular-Pin Relays

Washdown Enclosed Relays

Enclosed Relays

Hazardous Location Relays

Touch-Safe DIN-Rail Mount Infrequent-Cycle Relays

Sequenced Latching Relays

Latching Relays

Analog-Input Proportional-Control Relays

Circuit Board Safety Relays

Interface Safety Relays

Alternating Relays

Smart Multifunction Monitoring Relays

Motor Control Switches

Motor Starters

Low-Profile Motor Starters

Enclosed Motor Starters

Compact Enclosed Motor Starters

Reversing Motor Starters

Enclosed Reversing Motor Starters

Energy-Saving Motor Starters

Heavy Duty Motor Starters

Enclosed Heavy Duty Motor Starters

Manual Motor Starters

Build-Your-Own Manual Motor Starters

Heavy Duty Build-Your-Own Manual Motor Starters

Enclosed Heavy Duty Build-Your-OwnManual Motor Starters

DIN-Rail Mount Motor Voltage Monitors

Surface-Mount Motor Voltage Monitors

Socket-Mount Motor Voltage Monitors

Overload Protectors for Motor Starters

Timer Relays

High-Starting-Current DIN-Rail Mount Timer Relays

Timer Relays

Solid State Surface-Mount Timer Relays

Enclosed Heavy Duty Build-Your-Own
Manual Motor Starters