In the fast-moving world of electrical and industrial procurement, digital catalogues are essential.

This article spotlights 10 of the leading online catalogs in 2025, from deeply specialized platforms like Nassau National Cable to broad-line distributors like Grainger and Fastenal. Each brings a unique combination of product depth and service capabilities.

The range of the products includes:

• Power and infrastructure cabling

SER, SEU, URD, DLO, MC, TC-ER, PV wire, medium-voltage cable

• Building and branch-circuit wiring

NM-B (Romex), THHN, XHHW-2, RHW-2, USE-2

• Portable, flexible, and specialty cable

SOOW, SEOOW, Type W, welding cable, pump and marine cable

• Electrical components and enclosures

Conduit, boxes, disconnects, fittings, panels, grounding hardware

• Control, automation, and sensing

PLCs, HMIs, relays, power supplies, terminal blocks, sensors

• Industrial MRO supplies

Motors, fasteners, tools, PPE, lighting, adhesives, HVAC

• Wire and panel accessories

Connectors, lugs, cable ties, mounting clamps, heat shrink, splice kits

We selected the products based on:

• Scale & selection

• Specialization & depth

• Digital capabilities

• Service & logistics (delivery, fullfillment, etc).

• Supply chain transparency

Without further ado, let's dive into our line-up:

1. Nassau National Cable

NNC is known for its specialisation in electrical wire and cable. It offers one of the most comprehensive online catalogues dedicated to power distribution, industrial systems, renewable energy, and underground infrastructure. Nassau has evolved from a surplus dealer into a full-scale cable distributor, serving commercial, residential, and utility markets nationwide since launching its e-commerce platform in 2013.

• NNC sells both copper and aluminium conductors across a wide range of insulation types (PVC, XLPE, EPR, nylon, thermoset rubber)

• Covers building wire (NM-B Romex, THHN, XHHW-2), service entrance (SER, SEU), and underground distribution (URD duplex, triplex, and quadruplex)

• Offers tray cable (TC-ER) for industrial use, DLO and Type W for flexible portable power, SOOW and SEOOW for harsh environments, and PV wire for solar installations

• Includes armored cable (MC), control cable, pump cable, marine cable, and shielded instrumentation cable

• Accessories include lugs, wire pulling compounds, heat shrink tubing, and connectors

Extensive lineup of specialty cable, including:

• Fiber optic cable (224 SKUs)

• Marine and shipyard cable (374 SKUs)

• Lead automotive and electronic wire (153 SKUs)

• Submersible pump cable, mining and industrial cable, medium voltage (up to 35kV), and low-voltage options

• Also carries Belden cable, generator cables, portable cords, category cables, and EMEA-spec electrical cable

• Accessories include 2,000+ SKUs: wire lugs, connectors, heat shrink, pulling compounds, fixtures, displays, enclosures, and outlet boxes

• Features a dedicated clearance section and support for custom quotes

• Most products can be ordered by the foot with cut-to-length precision and real-time quotes

Best for: Contractors, engineers, and casual electrical buyers sourcing any electrical cables. NNC’s cable-first storefront supports both everyday wiring needs and complex industrial specs with cut-to-length orders, real-time quotes, and product sourcing across thousands of SKUs, all with fast turnaround and project-driven support.

2. Grainger

This platform is best known for its massive MRO and industrial supply catalogue that supports commercial, industrial, and institutional buyers across the U.S. Since 1927, Grainger has become a one-stop-shop for everything from wiring gear to facility maintenance tools.

• Electrical catalog includes THHN wire, conduit, outlets, switchgear, enclosures, and control devices

• Expands into plumbing, lighting, motors, safety gear, HVAC, and janitorial supplies

• Store is split into intuitive industrial categories with real-time inventory and contract pricing

Best for: Large procurement departments and facility managers sourcing across multiple electrical and industrial categories.

3. Amazon Business

Amazon Business is a B2B subplatform of Amazon. This platform is best known for bringing Amazon’s B2C convenience to the business world, offering millions of SKUs that include tools, meters, wiring accessories, and various electrical components.

• Lists wire rolls, connectors, conduit fittings, hand tools, testers, and breaker panels

• Fast, familiar checkout experience with tax-exempt tools and quantity discounts

• Marketplace model provides product depth and technical info varies by seller

Best for: Small teams and tradespeople who prioritise convenience and fast shipping over product specialisation.

4. McMaster-Carr

This platform is best known for its precision catalogue and exceptional speed. It focuses on wiring accessories and infrastructure hardware.

• Products include terminals, connectors, clamps, conduit, enclosures, and cable support hardware

• Offers technical drawings and specs for nearly every item

• Simple layout supports quick reordering and technical matching

Best for: Engineers and technicians who need high-accuracy accessories and mechanical components fast.

5. RS Americas (RS Group)

RS Americas has a deep focus on industrial automation and panel-building components. It serves OEMs and system integrators. The platform is formerly known as Allied Electronics.

• Carries PLCs, relays, connectors, sensors, power supplies, terminal blocks, and control wiring

• Supplies top brands with extensive spec filtering

• Catalogue supports industrial design and automation builds

Best for: Control panel builders, integrators, and automation engineers sourcing wiring components.

6. Newark (Element14)

Newark is best known for supporting electronics labs, prototyping environments, and R&D teams. It focuses on board-level components and small-scale wiring needs.

• Products include hook-up wire, test leads, meters, kits, and prototyping tools

• Also offers sensors, switches, development boards, and soldering gear

• Extensive filtering by electrical spec and insulation type

Best for: Electronic engineers and designers working with circuits, not conduit or building wire.

7. Arrow Electronics

Arrow Electronics has deep expertise in embedded systems, IoT, and edge-device components. It supplies OEMs with the building blocks for modern connected hardware.

• Products include sensors, microcontrollers, development kits, edge computing modules, and boards

• Also offers engineering support tools and digital design resources

• Not focused on field wiring or cable

Best for: Developers and manufacturers building embedded or connected systems.

8. Sonepar USA

Sonepar USA offers a full-line electrical distribution to commercial and industrial contractors. Sonepar combines online tools with branch-based logistics support.

• Carries cable, conduit, lighting, circuit protection, panels, and controls

• Supports national accounts and project-based ordering

• Online ordering available alongside branch pickup

Best for: B2B customers managing larger electrical builds across multiple trades.

9. Standard Electric Supply Co.

This platform is best known for serving industrial control and automation customers with a focus on panels, enclosures, and programmable components.

• Product range includes PLCs, HMIs, pushbuttons, relays, and safety devices

• Strong in control wiring accessories and mounting hardware

• Catalogue supports both quote-based and online ordering

Best for: Factory automation teams and OEMs needing control and enclosure components.

10. Fastenal

The company combines branch-based service with a wide-ranging online catalogue. Originally a fastener supplier, Fastenal now serves industrial clients with tools, safety, and select electrical products.

• Offers wire tools, PPE, cable clamps, enclosures, test equipment, and conduit fittings

• Known for vending machines and on-site supply management

• Limited in cable, but solid for jobsite accessories

Best for: Industrial and construction teams that want local access, jobsite replenishment, and general tool support.