Macro Magnetics
Macro Magnetics is a U.S.-based custom manufacturer of engineered magnetic and electrical solutions, including transformers, inductors, power supplies, and transformer disconnects, selling exclusively to Fortune 500 OEMs in Data Center, Drives, Elevator, Machine Tool, Ground Power, and Glass Manufacturing.
- Company typePrivate
- Founded1948
- HeadquartersGrand Haven, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Macro Magnetics does
Macro Magnetics is a U.S.-based custom manufacturer of engineered magnetic and electrical solutions, headquartered in Grand Haven, Michigan with a second manufacturing plant in Warner, New Hampshire (acquired from Warner Power in February 2016). The company was founded in 1948 as Precision Transformer by K.C. Retzlaff, incorporated in 1951 as Grand Transformers Incorporated, and has remained under family ownership since Gerald and Gregory Retzlaff purchased it in 1973. Its core products include custom dry-type transformers (450-1,300 kVA), industrial power supplies (SCR, melter, and multi-zone configurations), inductors and chokes, three-phase power distribution units, RF transformers, specialty filters, Daykin transformer disconnects, Termiflex handheld terminals, and electronic ballasts.
The underlying technology centers on custom magnetics design and in-house manufacturing of copper-wound transformers, magnetic steel laminations, and electro-mechanical assemblies. All products are engineered to OEM specifications through an RFQ-based sales process with engineering support spanning application, design, and prototyping phases. The business is sales-led, selling directly to commercial OEM and industrial end-use customers through direct engagement, with no channel intermediaries. Customers are exclusively Fortune 500 OEMs across six verticals: Data Center, Drives, Elevator, Machine Tool, Ground Power, and Glass Manufacturing. Revenue is generated through quote-based hardware sales with no disclosed standard pricing tiers, and the company holds ISO 9001 quality management certification. There are no software products, APIs, or AI-driven capabilities; the value proposition rests on engineering depth, application-specific customization, and long-standing OEM relationships built over more than 75 years.
Macro Magnetics firmographics
Firmographics- Name
- Macro Magnetics
- Legal name
- Macro Magnetics
- Website
- https://macromagnetics.com
- Company type
- Private
- Founded year
- 1948
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Macro Magnetics is a U.S.-based custom manufacturer of engineered magnetic and electrical solutions, including transformers, inductors, power supplies, and transformer disconnects, selling exclusively to Fortune 500 OEMs in Data Center, Drives, Elevator, Machine Tool, Ground Power, and Glass Manufacturing.
- Ownership category
- akta.pro rank
Macro Magnetics industry classification
Industry- Product category
- Custom Engineered Magnetic and Electrical Components
- NAICS
- Power, Distribution, and Specialty Transformer Manufacturing (335311), Other Electrical Equipment and Component Manufacturing (3359), Electrical Equipment Manufacturing (33531)
- SIC
- Electronic Coils, Transformers & Other Inductors (3677), Power, Distribution & Specialty Transformers (3612)
- akta.pro primary industry
- Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)
- akta.pro secondary industries
- Transformers & Magnetics (Power/Signal) (HDAHANAD), Passive Components (Resistors, Capacitors, Inductors, Ferrites) (IMAGAJAA), Inductors & Coils (Power/RF/Chokes) (HDAHANAC)
Keywords
Where Macro Magnetics is headquartered
LocationHeadquarters
- HQ city
- Grand Haven
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Macro Magnetics business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Custom Transformer and Inductive Component Sales: Sale of custom-engineered magnetic solutions including transformers, inductors, chokes, and power supplies to commercial OEM and industrial customers
- Industrial Power Supply Systems: Custom-designed power systems combining active control with proprietary transformers and other selected components
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
Macro Magnetics product offering
Product offeringCore offering
Macro Magnetics manufactures custom engineered magnetic and electrical products, including custom dry type transformers, industrial power supplies, transformer disconnects, inductors, chokes, and power distribution units. All units are designed to customer specifications to deliver an optimum combination of performance, size, and value for commercial OEM and industrial end-use customers.
Product overview
Macro Magnetics is a U.S.-based manufacturer of custom engineered electrical and magnetic solutions serving commercial OEM and industrial end-use markets. The company operates as a single unified manufacturing operation offering a portfolio of specialty inductive components including Custom Dry Type Transformers (ranging from 450 kVA to 1,300 kVA), Industrial Power Supplies (SCR, multi-zone, and melter configurations), Inductors and Chokes (DC chokes, load reactors, saturation core reactors), Power Distribution Units, RF Transformers, Specialty Filters, Daykin Transformer Disconnects, Termiflex Hand Held Terminals, and Electronic Ballasts. The product line is unified around custom magnetics design and manufacturing capabilities, with the acquired Warner Power brand (GreenStar and FurnaStar power supplies) integrated into the portfolio following the 2016 acquisition.
Differentiator
Problem solved
Functional benefit
Brands
- Daykin Transformer Disconnects: An electrical assembly consisting of a disconnect switch, copper wound transformer, fuse block and fuses.
Products and services
- Custom Dry Type Transformers
Companies that use Macro Magnetics
Customer profileNamed customers6 records
Segments2 records
Ideal customer profiles1 record
Macro Magnetics technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Macro Magnetics partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Warner PowercoreAcquisition of Warner Power, a New Hampshire-based provider of engineered power conversion products and services. Warner Power's product line including Termiflex handheld terminals and electronic ballasts was integrated into Macro Magnetics' offerings. This acquisition expanded Macro Magnetics' product portfolio and manufacturing capabilities in power conversion technology.
Scale indicators2 records
Recent moves8 records
Expansion highlights4 records
Macro Magnetics competitors and assessment
Company assessmentDirect peers
- Staco Energy Products: Manufacturer of power conditioning products including UPS, voltage regulators, and custom transformers for industrial and OEM customers. Comparable custom power-conversion capabilities and customer overlap.
- Magnetek: Designer and manufacturer of digital power and motion control systems including custom transformers, drives, and power-conversion products for industrial OEMs. Overlapping industrial OEM customer base and power-electronics capabilities.
- Coilcraft: Manufacturer of custom and standard inductors, transformers, and RF components serving industrial, automotive, and electronics OEMs. Comparable in offering application-specific inductive components and serving similar OEM customers.
- Triad Magnetics: US-based custom magnetics manufacturer producing transformers, inductors, chokes, and power conversion products for OEM and industrial markets. Directly comparable product portfolio, customer base, and custom-engineered business model.
- Hammond Manufacturing: Manufacturer of custom transformers, inductors, and electrical enclosures for industrial and OEM customers. Overlapping product lines (dry-type transformers, chokes, reactors) and similar North American industrial customer base.
- Acme Electric: Manufacturer of dry-type distribution transformers, power supplies, and related magnetics for industrial and commercial markets. Direct overlap with Macro's custom transformer and power-supply product lines.
- Dongan Electric Manufacturing: US manufacturer of custom transformers, reactors, and inductive components serving industrial OEMs. Similar custom-engineering approach and target verticals (drives, power, industrial controls).
- Jefferson Electric: Manufacturer of dry-type transformers, buck-boost transformers, and related magnetics for commercial and industrial markets. Comparable transformer-focused product line and US industrial customer base.
Broad incumbents
- Eaton: Global power management company with broad transformer, power supply, and industrial control portfolios. While much larger and more diversified, it competes with Macro in custom and standard magnetics for industrial OEMs.
- ABB: Global electrification and automation incumbent with extensive transformer, power conversion, and industrial product lines. Competes with Macro at the high end of custom power conversion and industrial magnetics.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights6 records
Customer concentration
Macro Magnetics social profiles
Digital presenceMacro Magnetics compliance and trust
Trust signalCompliance1 record
Macro Magnetics financial estimates
Financial estimateRevenue estimate
Valuation estimate
Macro Magnetics leadership team
Management profileNumber of profiles
Profiles2 records
Macro Magnetics subsidiaries and ownership
Company hierarchySubsidiaries1 record
Macro Magnetics funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Macro Magnetics M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Macro Magnetics
What does Macro Magnetics do?
Macro Magnetics manufactures custom engineered magnetic and electrical products, including custom dry type transformers, industrial power supplies, transformer disconnects, inductors, chokes, and power distribution units. All units are designed to customer specifications to deliver an optimum combination of performance, size, and value for commercial OEM and industrial end-use customers.
Is Macro Magnetics a public or private company?
Macro Magnetics is a private company. It is classified as family owned and is currently operating.
When was Macro Magnetics founded?
Macro Magnetics was founded in 1948. It employs 11 to 50 people.
Where is Macro Magnetics based?
Macro Magnetics is headquartered in Grand Haven, United States, in the North America region.
How does Macro Magnetics make money?
Two revenue lines are on record. Custom Transformer and Inductive Component Sales are the primary driver. The others are industrial Power Supply Systems.
Who are Macro Magnetics's main competitors?
Direct peers on record are Staco Energy Products, Magnetek, Coilcraft, Triad Magnetics, Hammond Manufacturing, Acme Electric, Dongan Electric Manufacturing and Jefferson Electric. Broad incumbents are Eaton and ABB.
Does Macro Magnetics have an API?
No public API is recorded for Macro Magnetics.
What industry is Macro Magnetics in?
Macro Magnetics's product category is Custom Engineered Magnetic and Electrical Components. Its primary akta.pro industry code is IMAGAAAA, Transformers (Power, Distribution, Instrument, Specialty), with a secondary code of HDAHANAD, Transformers & Magnetics (Power/Signal). Its NAICS code is 335311 and its SIC code is 3677.