Three-Phase Switches | McMaster-Carr

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843 Products

About Motor Switches and Starters

Motor Switches

Use these switches to turn motors on and off, or with lighting and electric heat circuits. They do not provide overload protection.

Washdown Enclosed Motor Switches

Install these switches in areas with oil, coolant, corrosive chemicals, and regular washdowns. They're rated IP69K and NEMA 4X and 12 or 12K.

Enclosed Motor Switches

These switches are housed in a plastic enclosure.

Hazardous Location Enclosed Motor Switches

Safely turn motors on and off near ignitable gases and dust—the housing on these switches seals in anything that could ignite flammable material.

Raintight Enclosed Motor Switches

Start and stop motors outdoors and in other wet environments.

Enclosure Motor Switches

Designed to mount on an electrical enclosure, these switches control motors, lighting, and electric heat circuits.

Reversing Motor Switches

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

Washdown Reversing Motor Switches

Rated NEMA 4, these switches are protected from washdowns.

Motor Starters

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.

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.

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.

Enclosed Heavy Duty Motor Starters

Housed in a durable steel enclosure.

Heavy Duty Motor Starters

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

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.

Enclosed Heavy Duty Build-Your-Own
Manual Motor Starters

Housed in a durable steel enclosure.

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.

Motor Voltage Monitors

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.

Disconnect Switches

Panel-Mount Compact Disconnect Switches

Install these switches in a panel cutout.

Enclosed Compact Disconnect Switches

Small yet mighty, these switches are about as tall and wide as an index card yet durable enough to mount directly to a wall.

Durable Disconnect Switches

Protected by a steel enclosure, these switches withstand tougher conditions than switches in a plastic housing. Also known as safety switches, they have quick-make/quick-break action to eliminate arcing and prolong switch life.

Outdoor Durable Disconnect Switches

A raintight NEMA 3R rated enclosure protects these switches outdoors.

Panel-Mount Disconnect Switches

Harsh Environment Panel-Mount
Disconnect Switches

Rated IP69K, these switches are protected from high-pressure and high-temperature washdowns.

Enclosed Disconnect Switches

Cut power and keep it isolated to prevent equipment from starting up during inspection and maintenance. These switches are housed in a protective enclosure that resists denting, chipping, and cracking.

Washdown Enclosed Disconnect Switches

The IP66 rated housing not only shields these switches from washdowns but also makes them durable enough to be mounted outside of an electrical panel.

Hazardous Location Enclosed Disconnect Switches

With a housing that’s designed to contain an explosion, these switches are safe to use in areas where ignitable concentrations of flammable or combustible gas, dust, or fibers may be present.

Enclosure Disconnect Switches

Mount these switches inside your enclosure to prevent it from opening when power is on—actuating the switch disconnects power and releases the door.

DIN-Rail Mount Disconnect Switches

Often used in electrical enclosures, these switches mount directly to DIN rails. They cut power and keep it isolated to stop equipment from starting up during inspection and maintenance.

Undervoltage Disconnect Switches

Prevent motors and other equipment from overheating or failing from not having enough voltage. When the supply voltage falls below 35% of the rated voltage, these switches will automatically turn off to protect the circuit from undervoltage.

Automatic Transfer Switches

When the microcontroller inside detects a power outage, these switches automatically fire up a backup generator. They’ll switch back to utility power once power is restored.

Relays

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 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.

Touch-Safe DIN-Rail Mount Infrequent-Cycle Relays

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

Safety Relays

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

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.

Control of Liquids, Gases, and Solids

Wall-Mount Temperature Switches

These temperature switches mount on walls and take remote temperature readings with a probe on a cable.

Washdown Wall-Mount Temperature Switches

To protect these switches from splashing water, corrosive liquid, and dust, the housing meets NEMA 4X for washdown conditions.

Washdown Wall-Mount Autotuning
Temperature Controllers

For protection in washdown conditions with splashing water, corrosive liquid, and dust, these controllers have a wall-mount housing that meets NEMA 4X. They’re ideal for systems with rapid, unpredictable, or complex temperature changes.

Pressure Switches for Water Pumps

Activate or deactivate your electric water pump based on water pressure. These switches turn your pump off when pressure increases to the set pressure and on when pressure drops to the reset pressure.

Pressure Switches for Air Compressors

Maintain the air pressure needed for air-powered devices. These switches turn your electric air compressor off when it reaches the set pressure and on when it reaches the reset pressure.

Multiport Pressure Switches for Air Compressors

With multiple ports, these switches maintain the air pressure of your electric air compressor, while also including ports for up to three air-powered devices, reducing the complexity of your air system setup.