RLH Industries

What RLH Industries does

RLH Industries, Inc. is a privately held U.S. manufacturer of industrial-grade fiber optic telecommunications equipment, founded in 1988 and headquartered at 936 N. Main Street, Orange, California. The company designs, manufactures, and supports copper-to-fiber media converters, industrial Ethernet switches, Ethernet I/O controllers, fiber patch panels, enclosures, cable assemblies, and power supplies engineered to operate in harsh environments — notably substations, transmission corridors, cell sites, and other locations subject to Ground Potential Rise (GPR) events, lightning, and electromagnetic interference. Its underlying technology centers on high-voltage isolation through all-dielectric fiber optic links, complemented by a patented Power Over Fiber (PoF) system that transmits power via laser light across multimode optical fibers to photovoltaic converters at remote receivers, enabling true galvanic isolation at distances up to 74 miles (120 km) across operating temperatures of -40C to +70C. Products are certified to IEEE 1590-2003, IEEE 487-2000 (Annex F), FCC Part 15, UL Listed, and Motorola Standard 59 specifications.

The company's business model is a hybrid of direct enterprise sales (quote-based, with dedicated account managers and a toll-free sales line), e-commerce through fiberopticlink.com for standard items, and field installation services delivered via a separate channel at rlhfiber.com. Distribution extends through representatives and distributors across North America and select international markets. RLH serves primary verticals including utilities/power companies (substation communications, SCADA, protective relaying), telecom/wireless carriers (cell sites in power corridors), wind energy, water-treatment facilities, and critical communications systems. Revenue is generated predominantly through one-time hardware sales with warranty coverage ranging from one year to Limited Lifetime on core products, supplemented by professional installation services. The company maintains full in-house design, engineering, manufacturing, and repair operations in the United States, including factory termination and certification of fiber cable assemblies, and offers custom cable and enclosure configuration through its website.

Name

RLH Industries

Legal name

RLH Industries, Inc.

Website

https://fiberopticlink.com

Company type

Private

Founded year

1988

Operating status

Operating

Headcount range

101–250 employees

Short description

RLH Industries is a U.S. manufacturer (founded 1988, Orange, California) of industrial fiber optic telecommunications equipment specializing in high-voltage isolation solutions for utilities, telecom carriers, and industrial operators operating in harsh electrical environments.

Ownership category

akta.pro rank

Product category

Fiber Optic Telecommunications Equipment

NAICS

Other Communications Equipment Manufacturing (33429), Fiber Optic Cable Manufacturing (335921), Other Communications Equipment Manufacturing (334290)

SIC

Computer Communications Equipment (3576), Electronic Connectors (3678), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Industrial Ethernet Media Conversion & Extenders (Copper/Fiber/SFP) (HDAFAJAG)

akta.pro secondary industries

Cable Assemblies & Patch Cords (Copper/Fiber) (HDAFALAF), Connectors, Jacks & Couplers (RJ45/LC/SC/MPO/MTP) (HDAFALAD), Industrial Networking & Communication Electronics Manufacturing (Ethernet switches, Fieldbus, Wireless) (IMAGAGAE), Telecom, SCADA & OPGW/Fiber Integration for T&D Projects (EUAEABAG)

Keywords

• Fiber optic media converters
• Industrial ethernet switches
• High voltage isolation systems
• Fiber optic patch panels
• Power over fiber technology

Headquarters

HQ city

Orange

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Hardware Sales: Sale of fiber optic equipment including converters, switches, cables, enclosures, patch panels, and accessories. Products sold directly and through distribution network. One-time purchase model with various warranty options ranging from 1-year to Limited Lifetime.
2. Installation Services: Field installation services for fiber optic solutions provided through rlhfiber.com channel. Complete turnkey solutions combining product supply with professional installation.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

RLH Industries designs, manufactures, and sells industrial fiber optic telecommunications equipment, including copper-to-fiber media converters, hardened Ethernet switches, Ethernet I/O controllers, fiber patch panels, enclosures, fiber cable assemblies, and patented high-voltage isolation and Power Over Fiber systems. The company also provides on-site field installation services for fiber optic deployments through a separate channel. All products are engineered and manufactured at the company's Orange, California facility and are built to operate in harsh industrial and high-voltage utility environments.

Product overview

RLH Industries offers a comprehensive portfolio of fiber optic connectivity solutions for industrial, telecommunications, and utility applications. The product line centers on Fiber Optic Converters and Industrial Ethernet Switches as core product categories, supplemented by Ethernet IO Products (Smart Series), Power Supplies, Fiber Cable Assemblies, Fiber Patch Panels, Enclosures, and Fiber Optic Isolation Systems. The company specializes in high-voltage isolation solutions using fiber optics to protect personnel and equipment in power substations and similar environments. Products are manufactured in Orange, California with warranty coverage ranging from 1 year to Limited Lifetime depending on product category.

Differentiator

Problem solved

Functional benefit

Brands

• Slimline: Slim, low-profile fiber patch panels with industrial durability and UL certification, designed for space-constrained enclosures in utility, industrial, and mission-critical applications.
• Smart Series
• Power Over Fiber (PoF)
• FiberLink

Products and services

• Fiber Optic Converters Industrial-grade copper-to-fiber media converters that convert electrical signals (Ethernet, contact closure, analog 4-20mA/0-10V, serial data, POTS, T1/4W) to optical signals for transmission over fiber optic cable, designed for utilities, telecoms, and industrial customers needing long-distance and high-voltage-isolated connectivity.
• Industrial Ethernet Switches Hardened Ethernet switches built for industrial environments, available in Gigabit, Unmanaged, Managed, Rack Mount, and Power-over-Ethernet (PoE/PoE+) variants, targeting utility, telecom, and industrial automation deployments.
• Ethernet I/O Products Ethernet-based input/output controllers for monitoring and controlling remote digital and analog I/O via web interface, Modbus TCP, SNMP, or DNP3 protocols, including Smart Series units with 4 or 8 channels for sensors, alarms, locks, and motors.
• Power Supplies AC/DC power supplies, DC/DC converters, solar power systems, battery packs, and charge controllers designed for telecommunications and remote-site industrial applications.
• Fiber Cable Assemblies Factory-terminated fiber optic cable assemblies including outdoor patch cords, MTP fiber cable, indoor/outdoor cable, armored cable, outside plant (OSP) cable, and tactical fiber cable, manufactured at the Orange, California facility.
• Fiber Patch Panels Fiber optic connection management panels available in DIN Mount, Wall Mount, Outdoor, and Rack Mount configurations with adapter plate options including ST, SC, LC, FC, MTRJ, and MTP.
• Enclosures Outdoor enclosures for telecommunication equipment providing secure and reliable protection from harsh environments, including outdoor cabinets, fiberglass enclosures, pedestals, and custom solutions.
• Fiber Optic Isolation Systems Industrial copper-to-fiber media converters that provide high voltage isolation for service providers and utility companies, including fiber cards for POTS, T1, 4-Wire Data, Ethernet, Serial, and Control Signals, plus card housings and power solutions.
• Power Over Fiber (PoF) System Patented technology providing power transmission over multimode optical fibers using laser light at the transmitter and a photovoltaic power converter at the receiver, enabling true galvanic power isolation for remote sites susceptible to power surges or lightning.
• Slimline Patch Panels Compact, low-profile fiber patch panels with rugged steel and aluminum construction and UL Listed certification, designed for space-constrained enclosures in utility, industrial, and mission-critical applications.
• Smart Series Ethernet I/O Advanced Ethernet I/O product line supporting SNMPv3, DNPv3 TCP, and Modbus TCP protocols with built-in web interface for monitoring and controlling sensors, push buttons, alarms, locks, and motors over copper and fiber Ethernet with real-time alerts.
• Industrial 5+2 Managed Gigabit SFP PoE++ Switch Industrial hardened managed Gigabit Ethernet switch with five copper ports plus two SFP ports and Power over Ethernet Plus Plus (PoE++) capability for powering downstream devices in industrial sites.
• Contact Closure Fiber Links Compact and rugged fiber optic converters for contact closure signals (alarm/status), offered in 1, 4, and 8 channel configurations with distances up to 74 miles, for automation control and security applications.
• Gigabit Ultra PoE++ Ethernet Fiber Media Converter Industrial-grade Gigabit Ethernet fiber media converter providing up to 90 Watts of PoE++ power per IEEE 802.3af/at/bt, with a dual-rate SFP port supporting 100Mbps or 1Gbps, extending Ethernet and power over fiber up to 74 miles (120km).
• iMux Modular Multiplexer System Fiber optic multiplexer system for combining multiple communication channels over a single fiber optic link, reducing fiber consumption in utility and industrial networks.
• CORE Cabinet Outdoor communications rack enclosure made from high-grade powder-coated aluminum alloy, with hinged doors, 3-point door latches, weatherproof seals, a door-alarm switch, and an integrated 19-inch equipment rack for housing fiber optic and networking gear in the field.
• Field Installation Services Professional on-site field installation services for fiber optic solutions offered through a separate rlhfiber.com channel, delivered as turnkey deployments combining RLH product supply with installation labor.

Quantifiable outcome

• Signal transmission up to 74 miles (120km) depending on product type
• +3 more outcomes

Segments7 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Transition Networks: Transition Networks (a Lantronix company) manufactures industrial media converters, Ethernet switches, and fiber connectivity products targeting utility, transportation, and industrial customers — a direct head-to-head overlap with RLH's core converter and switch portfolio.
• Omnitron Systems: Omnitron Systems builds ruggedized media converters, Ethernet switches, and PoE products for utility, industrial, and smart-city networks. It competes with RLH in copper-to-fiber conversion and hardened industrial Ethernet.
• Antaira Technologies: Antaira offers industrial Ethernet switches, media converters, and serial-to-fiber devices for harsh-environment automation, SCADA, and utility applications — overlapping directly with RLH's industrial switch and converter lines.
• Moxa: Moxa is a global leader in industrial networking — hardened Ethernet switches, media converters, and protocol gateways used in power substations, rail, and factory automation. It is one of RLH's closest scaled comparables for utility/OT Ethernet.
• Westermo (a Beijer Electronics company): Westermo specializes in rugged industrial data communications — switches, routers, and media converters for rail, utilities, and other harsh environments — making it a strong functional peer to RLH's industrial Ethernet and isolation product lines.

Broad incumbents

• Phoenix Contact: Phoenix Contact is a large industrial connectivity vendor with significant presence in substation communications, surge protection, and fiber components. It overlaps RLH's isolation and substation focus as part of a much broader portfolio.
• Siemens (RUGGEDCOM / SCALANCE): Siemens sells ruggedized networking (RUGGEDCOM) and substation communications equipment globally, often embedded in larger utility and rail projects. RLH frequently co-exists or competes against Siemens at the substation edge.
• CommScope: CommScope is a major fiber optic cabling, patch panel, and connectivity infrastructure vendor serving telcos and cable operators. It overlaps with RLH's cable assembly and patch panel business at much greater scale.
• Corning Incorporated: Corning is the dominant manufacturer of optical fiber, fiber cable assemblies, and connectivity hardware. While RLH competes only tangentially as an integrator, Corning's product portfolio (cable, connectors, housings) overlaps RLH's physical-layer catalog.
• GarrettCom (a Belden brand): GarrettCom (now under Belden) supplies hardened industrial Ethernet switches and media converters for utility substations, transportation, and industrial automation. It is a long-standing peer in RLH's substation and SCADA niche.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/rlh-industries-inc.

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about RLH Industries