Electrical Accessories - Dwyer
Electrical accessories complete control panels and machines. Push buttons, signal devices, connectors, thermal management and cable systems let operators control equipment and keep panels running reliably.
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Instrumentation refers to devices that measure or control physical variables such as temperature, level, flow, or pressure. These products are essential in the industry because they allow for maximum output with minimum use of raw materials. Flow instruments include flow meters, positive displacement meters, rotameters, flow switches, oval gear meters, and calibration equipment. Analytical instruments measure temperature, pH, conductivity, dissolved oxygen, turbidity, humidity, chlorine, gases, trace oxygen resistivity, and carbon. Pressure instruments include pressure gauges, pressure switches, pressure transmitters, differential pressure gauges, cryogenic gauges, O.E.M. gauges, submersible gauges, digital pressure gauges, and calibration equipment. Level instruments, such as ultrasonic sensors, magnetic float sensors, capacitance sensors, submersible pressure sensors, differential pressure sensors, float valve sensors, float switches, electro-optic sensors, and radar sensors, are used to measure the level of a substance in a container or vessel.
Shop by type: Seals and Accessories | Flow Control | Pressure Control | Controllers | Recorders | Instrument/Compression Fittings | Sensors
Related categories: Actuation and Engineered Products | Process Systems and Process Equipment | Sanitary Equipment | Power Transmission & Application Tools
Electrical enclosures protect control equipment from dust, water, chemicals and impact, and protect people from live components. The right enclosure is essential for safe, reliable control panels.
Enclosure Types
- Standard enclosures – wall-mount, floor-standing and junction boxes
- Custom enclosures – built to your dimensions and cutouts
- Stainless and fiberglass – corrosion resistance and washdown
- Accessories – back panels, locks, windows and thermal management
Choosing an Enclosure
Select the NEMA or IP rating for the environment, then size it for components with room for wiring and heat dissipation. Consider material, mounting and access needs.
Centro supplies standard enclosures for control panels, plus custom enclosures made to order by leading manufacturers.
Shop by type: Standard Enclosures
Related categories: Pneumatic and Electronic Controls | Motor Control | Pneumatic Cylinders and Actuators
$77.10
Subject to factory lead times
$80.75
$26.57
$146.80
$27.58$33.10
Subject to factory lead times
$22.63$27.15
Subject to factory lead times
$34.25$41.10
Subject to factory lead times
$34.25$41.10
Subject to factory lead times
$30.67$36.80
Subject to factory lead times
$27.58$33.10
Subject to factory lead times
$77.10
Subject to factory lead times
$80.75
$26.57
$146.80
$27.58$33.10
Subject to factory lead times
$22.63$27.15
Subject to factory lead times
$34.25$41.10
Subject to factory lead times
$34.25$41.10
Subject to factory lead times
$30.67$36.80
Subject to factory lead times
$27.58$33.10
Subject to factory lead times
- Industrial control panels rely on a range of electrical accessories to organize wiring, provide operator input, and indicate system status. Common categories include push buttons and selector switches for operator control, pilot lights and indicator lights for visual status feedback, terminal blocks for organizing and connecting field wiring, wire duct (also called wiring trunking) for routing and managing cables within the enclosure, DIN rail for mounting components, and cable glands and cord grips for securing cables entering the enclosure. These accessories may seem secondary to the main control devices, but they are essential for building a panel that is safe, organized, and maintainable.
- The 22mm and 30mm designations refer to the panel cutout diameter — the size of the hole required to mount the device. 22mm is the current IEC standard and is the most widely used size in new industrial panel designs worldwide. 30mm is the traditional NEMA standard, still common in North American heavy-industrial and legacy panels. Functionally, both sizes offer the same types of operators — flush, extended, mushroom head, illuminated, and emergency stop — but 22mm devices are more compact, allowing more operators in a smaller panel footprint. When designing a new panel, 22mm is the standard choice unless the application requires the larger 30mm format for gloved-hand operation or compatibility with an existing panel cutout.
- Terminal blocks are modular, insulated connectors mounted on DIN rail inside a control panel that provide a secure, organized connection point between field wiring and internal panel wiring. Instead of splicing wires together or landing every field wire directly on a device terminal, terminal blocks create a clean interface — field wires land on one side, and internal panel wires connect on the other. This makes troubleshooting, testing, and future modifications far easier because individual circuits can be disconnected and tested at the terminal block without disturbing the device wiring. Terminal blocks are available in screw-clamp, spring-clamp, and push-in styles, and in configurations for signal wiring, power distribution, grounding, fused circuits, and sensor connections.
- Wire duct (also called wiring trunking or cable raceway) is a slotted plastic channel mounted inside a control panel to route and organize wiring between components. The slots along the sides allow wires to exit the duct at any point along its length, providing clean access to terminal blocks, contactors, circuit breakers, and other devices. To select the correct size, the general rule is that wires should fill no more than 40–50% of the duct's cross-sectional area — this allows room for adding wires in the future and prevents excessive heat buildup. Duct is available in various widths and depths, and in standard slotted, narrow-slot, and solid-wall versions depending on the wire gauge and density of the application.
- An emergency stop push button is a safety device that immediately de-energizes a machine or process when pressed by an operator. E-stops are typically large, red, mushroom-head buttons on a yellow background for high visibility, and they use a latching mechanism — once pressed, they stay locked in the off position until manually released by twisting, pulling, or using a key. This prevents accidental restart. OSHA and machine safety standards (such as NEMA ICS 6 and ISO 13850) require emergency stop devices on machinery where a hazard to personnel exists. E-stops must be wired into the safety circuit so that pressing the button removes power from all hazardous motion. They should be mounted in a location that is immediately accessible to the operator, and every machine should have at least one.