Terminal Boxes | McMaster-Carr

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4,589 Products

Electrical Power, Networking, and Controlling

Terminal Blocks

Create tidy rows of wire connections that you can identify, test, and adjust on the spot

47 products

Wall Plates

Cover switches and outlets for a finished look or to close them off when not in use

1 product

Extension Cords

Extend the reach of power from an outlet

2 products

Electrical Enclosures

House and protect power supplies, control panels, and other electrical equipment

2,210 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

208 products

Outlet Box Covers

Enclose wiring for outlets and switches or block off unused components

85 products

Electrical Enclosure Covers

Replace Fibox enclosure covers

98 products

Raceway and Fittings

Route and guard wiring along surfaces in your facility

297 products

Potting Boxes

Fill with potting compound to protect electronic assemblies from dust, moisture, and vibration

16 products

Outlet Box Extenders

Add depth to an outlet box when there’s not enough space for components

50 products

Electrical Enclosure Panel Mounts

Add a secondary panel that swings to mount more components in your enclosure

2 products

Electrical Enclosure Mounting Channels

Position components inside electrical enclosures without drilling holes, which can leak

9 products

Console Enclosures

Build out interfaces with buttons, gauges, and other components to monitor and control machinery

9 products

Electronics Racks

Mount servers, automation controls, and computers in less space than electronics cabinets

9 products

Electronics Cabinets

Store and organize servers, computers, and automation controls

15 products

Electrical Enclosure Pedestals

Mount enclosures at a comfortable height to access switches, displays, and other controls

6 products

Monitor Enclosures

Shield displays and televisions from impact, dust, and splashing liquids

18 products

Underground Enclosures

Bury in the ground or in concrete to protect and access utilities such as electric and water lines

9 products

Electrical Enclosure Pole Mounts

Everything you need to secure enclosures to round poles or beams

14 products

Electrical Enclosure Floor Stands

Mount enclosures to the floor above hazards such as water

8 products

Electrical Enclosure Positioning Arms

Hang your human-machine interface and swivel it around to save floor space and access equipment

24 products

Single-Board Computer Enclosures

Protect your Raspberry Pi, Arduino, or other board from dust and impact

9 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

5 products

VFDs

Control the speed and torque of AC electric motors

18 products

Motor Starters

Turn motors on and off and protect them from current overloads

451 products

Motor Starter Overload Protectors

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

8 products

Circuit Board Enclosures

Hold circuit boards to protect them from dust, liquids, or overheating

82 products

Motor Switches

Turn motors, lighting, and electric heat circuits on and off

45 products

Relays

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

251 products

Timer Relays

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

59 products

Interface Relays

Isolate input and output circuits to protect PLCs and other controllers

45 products

Lighting Relays

Control lighting circuits and switch lighting systems on or off

13 products

Latching Relays

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

29 products

Infrequent-Cycle Relays

Use with equipment that cycles on and off, such as HVAC systems

138 products

Safety Relays

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

26 products

Proportional-Control Relays

Gradually adjust output instead of turning on or off

12 products

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

33 products

Battery Holders

Create an electrical connection between batteries and contacts to power equipment

2 products

Measuring and Inspecting

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

2 products

Power Transmission

Electric Actuators

Push and pull loads with more precise positioning than air and hydraulic cylinders

12 products

Servomotors

Create rotary motion with accurate positioning and fine control over speed and torque

97 products

Stepper Motors

The motor shaft turns in small, equal increments for precise positioning

119 products

Electric Gearmotors

A motor and speed reducer in one to slow speed and increase torque in AC- or DC- power applications

52 products

Electric Motors

Keep machinery and equipment moving with AC or DC power

15 products

Stepper Gearmotors

Stepper motor and gearbox in one for high torque in areas large motors won’t fit

14 products

Building and Machinery Hardware

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

2 products