What Toroid does

Toroid Corporation is a Salisbury, Maryland-based, family-owned manufacturer of toroidal power transformers and inductors, founded in 1982 by Swedish immigrant Gunnar Ennerfelt and operating under second-generation leadership since 2006. The company designs and builds both standard and custom toroidal transformers covering a 20VA to 18,000VA power range, using grain-oriented silicon steel cores wound into donut-shaped geometries with laser-scribed or plasma-etched processing. Core product lines include standard toroidal transformers, medical-grade isolation transformers (bare and Isobox-enclosed) meeting UL 60601-1, IEC 601-1, CSA C22.2 No. 601, and EN 60601-1, general isolation transformers, balanced power transformers, industrial control transformers, power supply/rectifier transformers, auto-transformers, dimmable lamp transformers, tube amplifier transformers, and current transformers, plus a DIY transformer kit line and mounting hardware accessories.

The company's competitive positioning rests on a proprietary design software suite refined over 20 years that enables first-time-right custom prototypes (guaranteed free if not), industry-leading breadth of standard designs, ISO 9001-certified US manufacturing since 1983, and an accumulated 400+ years of in-house engineering and production experience. Pricing is quote-based for custom designs and direct for standard products, with revenue generated from one-time hardware sales across a quote-to-production workflow. The go-to-market is sales-led with inside and field sales representation across the United States, supported by a direct factory channel, technical website catalog, and a sister company (Toroid do Brasil) serving South America; a 2005 China manufacturing partnership supplements capacity, and a wholly-owned subsidiary (Toroid Panels & Harnesses, opened 2017) extends the offering into harness and panel subassemblies.

Name

Toroid

Legal name

Toroid Corporation Inc.

Website

https://toroid.com

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

11–50 employees

Short description

Toroid Corporation is a family-owned Salisbury, Maryland manufacturer of standard and custom toroidal power transformers and inductors, serving medical, industrial, audio, lighting, avionics, marine, and test-and-measurement OEMs across 20VA to 18,000VA ratings with US-made, ISO 9001-certified production.

Ownership category

akta.pro rank

Product category

Toroidal Power Transformers and Inductors

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Transformers & Magnetics (Power/Signal) (HDAHANAD), Instrument Transformers (CTs/VTs) & Sensors (Conventional/Optical) (EUADACAG)

Keywords

• Toroidal power transformers
• Medical isolation transformers
• Industrial control transformers
• Custom magnetics manufacturing
• Current transformer design

Headquarters

HQ city

Salisbury

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Toroidal Transformer Sales: Design and manufacture of custom toroidal transformers from 1 piece to 20,000 units; power ratings from 20VA to 18,000VA; revenue generated from engineering design fees and production orders
2. Standard Toroidal Transformer Sales: Sale of standard designed toroidal transformers with dual primaries and dual secondaries; industrys largest selection; products include medical, isolation, power supply, control, lamp, current transformers
3. Transformer Kit Sales: Sale of DIY transformer kits with factory-made primaries in five power ratings (80VA to 1400VA); includes core, Mylar tape, thermal fuse, instructions; optional engineering assistance for $175 per design
4. Mounting Hardware and Accessories: Value-added mounting hardware including washers, pads, Poly-Mount, L-Bracket, Omega Bracket, potted centers; connectors and cable assemblies; enclosures

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels3 records

Core offering

Toroid Corporation designs, engineers, and manufactures toroidal power transformers and inductors ranging from 20VA to 18,000VA at its Salisbury, MD facility. The company sells the industry's largest selection of standard toroidal designs (medical isolation, Isobox, general isolation, balanced power, industrial control, power supply, auto, dimmable lamp, tube amplifier, and current transformers) alongside fully custom toroidal transformers produced from 1 prototype to 20,000 units, supplemented by DIY transformer kits and mounting hardware.

Product overview

Toroid Corporation is a manufacturer of toroidal power transformers and inductors offering both standard designs and custom solutions. The product portfolio centers on toroidal transformer technology with power ratings from 20VA to 18,000VA. Core offerings include Standard Toroidal Transformers, Medical Isolation Transformers (available as bare units or in Isobox enclosures), General Isolation Transformers, Balanced Power Transformers, Industrial Control Transformers, Power Supply/Rectifier Transformers, Auto-Transformers, Dimmable Lamp Transformers, Tube Amplifier Transformers, and Current Transformers. The company also sells Transformer Kits for DIY applications, along with mounting hardware accessories (washers/pads, Poly-Mount, L-Bracket, Omega Bracket, Euro-Mount, Potted Center, Choke-Mount). Value-added services include custom connectors and leads through their sister company Toroid Panels & Harnesses. All products are manufactured at the Salisbury, MD facility and the company maintains ISO 9001 certification.

Differentiator

Problem solved

Functional benefit

Products and services

• Standard Toroidal Transformers Industry's largest selection of standard designed toroidal power transformers with dual primaries and dual secondaries, spanning small to large power ratings for medical and commercial applications.
• Medical Isobox Transformers Medical grade isolation transformers housed in Isobox enclosures built to meet stringent medical equipment safety requirements for patient-care electronics.
• Medical Isolation Transformers (Bare Toroidal) Bare toroidal transformers designed for medical equipment meeting UL 60601-1, IEC 601-1, and CSA C22.2 No. 601 standards with low leakage currents.
• General Isolation Transformers Isolation transformers for general commercial and industrial applications providing electrical isolation and safety.
• Balanced Power Transformers Balanced power transformers engineered to reduce noise and supply clean power for sensitive electronic equipment.
• Industrial Control Transformers Toroidal transformers designed for industrial control panel applications with over 5,000 different standard configurations available.
• Power Supply Transformers Rectifier transformers for power supply applications including single primary, dual primary, solid-state, and multi-voltage configurations.
• Auto-Transformers Toroidal auto-transformers for stepping voltage up from 120V to 230V or down from 230V to 120V, available in 250VA to 1000VA ratings.
• Dimmable Lamp Transformers Toroidal transformers designed for use with dimmers without noticeable hum, optimized for halogen lamp life and performance, rated 20W to 1000W.
• Tube Amplifier Transformers Low temperature rise transformers with excellent voltage regulation and low mechanical noise specifically designed for tube amplifier applications.
• Current Transformers (CTs) Custom designed current transformers for measuring power/current and control or protective purposes, ranging from microamps to thousands of amperes.
• Transformer Kits DIY transformer kits containing toroidal core, Mylar tape, thermal fuse, and instructions for customers to wind their own secondary windings, available in 80VA to 1400VA ratings.
• Custom Inductors Custom toroidal inductors for various applications including DC filter chokes for 60Hz.
• Mounting & Hardware Mounting options including washers and rubber pads, Poly-Mount, L-Bracket, Omega Bracket, Euro-Mount, Potted Center, and Choke-Mount hardware.
• Leads & Connectors Custom connectors and leads to customize transformers, available through Toroid Panels & Harnesses (Toroid P&H) value-added services.
• Custom Toroidal Transformers Custom-designed toroidal transformers from 1 prototype to 20,000 units, power ratings 20VA to 18,000VA, with proprietary software guaranteeing first-time-right prototypes.

Quantifiable outcome

• Toroidal transformer weighs about 50% less than conventional transformer with same capacity and heat rise
• +3 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Toroid do BrasilcoreChannel Partner/ Reseller/ DistributorSister company established to serve South American markets; located in Sao Jose dos Pinhais, Parana, Brazil; provides local sales and support for Toroid products in Brazil and surrounding regions
• China Manufacturing FacilityminorStrategic or Co-development PartnerPartnership formed in 2005 with a manufacturing facility in China to supplement production capacity; serves as satellite plant for certain operations

Scale indicators6 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Signal Transformer (Bel Fuse): Manufacturer of standard and custom power transformers, chokes, and inductors (including toroidal designs) for industrial, medical, and audio markets under the Bel Fuse umbrella — same product categories, similar custom-capability story, broader distribution.
• Plitron Manufacturing: Canadian manufacturer specializing in toroidal transformers and inductors for audio, medical, and industrial power applications; competes head-to-head with Toroid on toroidal technology and custom engineering depth.
• Triad Magnetics: US-based manufacturer of toroidal and laminated transformers, chokes, and inductors serving medical, industrial, and audio applications with both standard and custom designs — directly comparable product portfolio, customer base, and engineering-led GTM motion to Toroid.
• Premier Magnetics: US manufacturer of custom and standard toroidal and laminated transformers, chokes, and inductors for medical, industrial, and audio applications — directly comparable in product mix, custom-engineering focus, and customer verticals to Toroid.
• Hammond Manufacturing: Long-established North American manufacturer of standard and custom transformers, chokes, and enclosures serving industrial, electronic, and medical customers with a comparable breadth of catalog and custom offerings.
• Amgis / Talema Group: Specialty manufacturer of toroidal transformers, chokes, and current sensors for medical, industrial, and renewable energy applications — directly overlapping product line and customer verticals with Toroid's toroidal portfolio.

Broad incumbents

• Coilcraft: Large US-based magnetics manufacturer offering inductors, transformers, and chokes for power, RF, and signal applications; broader catalog and global footprint than Toroid, but overlaps on toroidal and power magnetics for industrial customers.
• Acme Electric (Hubbell): Established manufacturer of dry-type distribution transformers, control transformers, and power magnetics serving industrial and commercial customers — overlaps with Toroid's industrial control and isolation transformer lines, but at much higher volumes and broader scale.
• Jefferson Electric: Manufacturer of standard and engineered transformers (dry-type, encapsulated, buck-boost) for industrial and commercial markets; competes on industrial control and distribution transformers but does not focus on toroidal construction.
• Wurth Elektronik (eiSos): Global electronic component manufacturer with a sizable magnetics line including transformers, chokes, and inductors for industrial and medical applications; competes with Toroid on power magnetics but as part of a much broader component portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries2 records

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 Toroid