Three-Phase Relays | McMaster-Carr

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 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.

Safety Relays

Receive signals from safety monitoring relays or controllers to switch devices off and on because of a system failure.

Touch-Safe DIN-Rail Mount Infrequent-Cycle Relays

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

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.

High-Current Lighting Relays

Switch lighting systems on and off—these relays can handle the high switching current on large overhead light systems.

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.

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.

Energy-Saving Motor Starters

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

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.

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.

Surface-Mount Motor Voltage Monitors

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

DIN-Rail Mount Motor Voltage Monitors

Mount these monitors to DIN rail.

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.

About Motor Switches and Starters

Relays

DIN-Rail Mount Solid State Relays