The American Rotary

What The American Rotary does

The American Rotary is a privately held U.S. manufacturer of rotary phase converters and three-phase transformers, founded in 1991 (per firmographic records; a separate source cites 1998) and headquartered at 2305 Stonebridge Road in West Bend, Wisconsin, where all design, assembly, testing, and stocking occur for same-day shipment. The company's core function is converting single-phase utility power into balanced three-phase power for operating industrial equipment where three-phase utility service is unavailable or cost-prohibitive, with technology spanning a proprietary MicroSmart digital microprocessor controller (voltage monitoring every 50ms), a custom ABB/Baldor induction generator engineered to cut inrush current by 83% and carry a Soft Start rating, a CTR Current Transient Reactor, ISR magnet wire, built-in surge protection, and a full current magnetic starter.

The product portfolio is organized into five converter series (AR Pro general-purpose, AD Digital, ADX Extreme Duty, AUL UL Listed, AI Industrial Grade with NEMA 3R enclosures) plus a DIY STK panel, with unit prices ranging from $599 to over $52,000 and complementary accessories (motor starters, load centers, disconnect switches, enclosed contactors, transformers, replacement parts). Distribution is primarily direct-to-consumer via an e-commerce site with sizing wizard and engineer-staffed phone sales, supplemented by a global distributor network, a Diamond Elite Dealer/OEM channel for custom-branded units, and trade show presence at events like Blade Show Atlanta and FABTECH. Customers are fragmented across machining/metalworking, agriculture, food service, industrial manufacturing, and woodworking, with a long-tail of SMB and prosumer buyers replacing or avoiding costly utility 3-phase upgrades.

Name

The American Rotary

Legal name

American Rotary

Website

https://americanrotary.com

Company type

Private

Founded year

1998

Operating status

Operating

Headcount range

11–50 employees

Short description

The American Rotary is a privately held Wisconsin-based manufacturer of rotary phase converters and three-phase transformers, converting single-phase utility power into balanced three-phase power for industrial buyers in machining, agriculture, food service, woodworking, and general manufacturing through DTC e-commerce and a global distributor network.

Ownership category

akta.pro rank

Product category

Phase Converters and Power Conversion Equipment

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Switchgear and Switchboard Apparatus Manufacturing (335313), Relay and Industrial Control Manufacturing (335314)

SIC

Power, Distribution & Specialty Transformers (3612), Electronic Coils, Transformers & Other Inductors (3677), Switchgear & Switchboard Apparatus (3613), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

DC-AC Inverters (Industrial inverters, standalone/embedded) (IMAGADAC)

akta.pro secondary industries

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA), Electromechanical Components (Relays, Switches, Potentiometers, Encoders) (IMAGAJAB), Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards) (IMAGAEAA)

Keywords

• Rotary phase converters
• Three-phase power equipment
• Single to three-phase conversion
• Industrial power supplies
• Phase conversion transformers

Headquarters

HQ city

West Bend

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Phase Converter Sales: Primary revenue stream from selling rotary phase converters across multiple series (AR Pro, AD Digital, ADX Extreme Duty, AUL UL Listed, AI Industrial). Products range from 5 HP to 300 HP units with prices from $599 to over $50,000. Both wall-mount and floor-mount configurations available.
2. Accessories and Components: Sale of phase converter accessories including surge protectors, phase monitors, panel mount breakers, receptacles, remote starters, and mounting feet. Prices range from $19 to $169.
3. Installation Accessories: Installation products including enclosed contactors ($359-$2,399), disconnect switches ($109-$349), load centers ($219-$599), and surge suppressors.
4. DIY STK Panels: Sale of DIY rotary phase converter panels for customers who want to pair with their own motor. Panels range from 5-40 HP starting at $290.
5. Transformers: Three-phase transformers for voltage conversion including auto transformers ($1,499-$2,199+) and isolation transformers ($3,999-$5,599+). Partnerships with Hammond Power Solutions.
6. Replacement Parts: Replacement components including AI filters ($159), capacitors (starting at $39), and contactors (starting at $59) for servicing existing units.
7. Professional Services: Technical support, engineering consultation for sizing, and same-day replacement services included with product purchases.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels7 records

Core offering

American Rotary designs, manufactures, and distributes rotary phase converters that convert single-phase electrical power into balanced three-phase power for running industrial and commercial equipment. The product line spans five main series (AR Pro, AD Digital, ADX Extreme Duty, AUL UL Listed, AI Industrial) from 5 HP to 300 HP, complemented by transformers, motor starters, load centers, disconnect switches, enclosed contactors, DIY panels, replacement parts, and custom OEM solutions. All products are designed, built, tested, and stocked at the company's Wisconsin facility.

Product overview

American Rotary is a U.S.-based manufacturer of rotary phase converters that convert single-phase electrical power into balanced three-phase power. The product portfolio centers on five main phase converter series: AR Pro Series (general-purpose), AD Digital Series (voltage-sensitive equipment with MicroSmart control), ADX Extreme Duty Smart Series (high-torque industrial loads), AUL UL Listed Smart Series (certified installations), and AI Industrial Grade Series (weather-resistant outdoor/agricultural use). These core products are complemented by supporting accessories including motor starters, load centers, disconnect switches, enclosed contactors, transformers, and replacement parts. The company also offers custom product options for OEM and dealer partners, and DIY STK panels for customers building their own phase converter systems. All products are designed, engineered, and assembled in Wisconsin, USA, using proprietary technology including custom Baldor generators and MicroSmart digital controllers.

Differentiator

Problem solved

Functional benefit

Brands

• Smart Series: Digital rotary phase converters featuring MicroSmart controller technology for precision voltage control
• Pro Series
• ADX - Extreme Duty Smart Series
• AUL - UL Listed Smart Series
• AI - Industrial Grade Series

Products and services

• AR Pro Series Rotary Phase Converters General-purpose rotary phase converters that convert single-phase power into balanced three-phase power for workshops, farms, and small industrial environments. Available from 5 HP ($599) to 40 HP ($3,999). Designed for woodworking machinery, pumps, compressors, welders, and general shop tools.
• AD Digital Series Phase Converters Digital phase converters with MicroSmart controller for voltage-sensitive equipment including CNC machines, VFD systems, EDM equipment, and precision industrial applications. Available from 5 HP ($675) to 75 HP ($8,399).
• ADX Extreme Duty Smart Series Rotary Phase Converters Extreme-duty rotary phase converters designed for demanding industrial applications requiring high starting torque and stable power delivery. Built for heavy industrial equipment with high inertia loads including compressors, pumps, blowers, lathes, and CNC machinery. Available from 5 HP ($799) to 300 HP ($43,992).
• AUL UL Listed Smart Series Rotary Phase Converters UL-certified rotary phase converters meeting US and Canadian electrical safety standards for commercial and industrial installations requiring UL-listed equipment. Available from 10 HP ($1,498) to 300 HP ($45,188). Includes built-in surge protection.
• AI Industrial Grade Series Rotary Phase Converters Industrial-grade rotary phase converters with fully enclosed NEMA 3R weather-resistant design for outdoor installations and harsh agricultural or industrial environments. Available from 20 HP ($3,699) to 300 HP ($52,648).
• STK Phase Converter Panel DIY rotary phase converter control panel for customers building their own phase converter by pairing the panel with a user-supplied 3-phase delta wound motor. Available in 5 HP to 40 HP models starting at $290.
• Three-Phase Transformers Auto and isolation transformers for voltage conversion (208V to 600V), including Multi-Tap Auto Transformers and isolation transformers in Delta to Wye, Delta to Delta, and Wye to Wye configurations for CNC machines, industrial equipment, HVAC, and imported machinery. Auto transformers $1,499 to $2,199+; isolation transformers $3,999 to $5,599+.
• Motor Starters Motor control devices with built-in overload protection for 208-240V industrial systems, available in 5-80 amp models for motors ranging from 2 HP to 25 HP. Provide controlled motor starts and shutdown protection.
• Load Centers Power distribution units for running multiple 3-phase equipment from a single source. Available in 125A-225A models with 12-42 circuits for 208Y/120V, 240/120V, and 240V systems. Priced from $219 to $599.
• Disconnect Switches UL-listed non-fused safety switches for safely shutting off power to equipment for maintenance. Available in indoor (NEMA 1) and outdoor (NEMA 3R) ratings, priced from $109 to $349.
• Enclosed Contactors Automatic control devices that monitor power from phase converters and disconnect loads if voltage becomes unbalanced or a phase is lost. Available in 5.5-150 amp models for protecting CNC machines, welders, compressors, and industrial equipment. Priced from $359 to $2,399.
• Phase Converter Accessories Supporting accessories for phase converter installations including inline surge protectors, phase monitors, panel mount breakers, receptacles, connector body plugs, wired remote starters, and rubber isolation mounting feet. Priced from $19 to $169.
• Phase Converter Replacement Parts Replacement components for maintaining and servicing phase converters including AI filters ($159), capacitors (starting at $39), and contactors (starting at $59).
• Custom Products for OEMs and Diamond Elite Dealers

Quantifiable outcome

• 83% reduction in inrush current compared to stock TEFC/ODP motors requiring 600% more inrush
• +4 more outcomes

Named customers8 records

Segments6 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core.

• ABB/Baldor ElectriccoreTechnology or IntegrationAmerican Rotary partnered with ABB/Baldor Electric, one of the world's largest and most respected motor manufacturers, to supply custom-engineered idler/generators specifically designed for phase conversion applications. American Rotary's engineering departments spent over 2 years designing this custom generator, which reduced inrush current by 83% and received a Soft Start rating. Baldor manufactures these custom generators 100% in the USA.
• Hammond Power SolutionscoreTechnology or IntegrationAmerican Rotary partners with Hammond Power Solutions, a leading manufacturer of industrial transformers, to supply transformers including auto transformers and isolation transformers for voltage conversion applications. These transformers are used with phase converters for applications including CNC machines, industrial equipment, and HVAC systems.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Eaton: Global power management company with switchgear, motor controls, transformers, and industrial control products. Overlaps with American Rotary's load centers, disconnect switches, and motor starters in industrial and commercial installations.
• ABB: Global industrial power equipment and motor manufacturer. Custom Baldor generator supplier/partner to American Rotary and a broad incumbent in drives, motors, and power electronics that competes in adjacent categories.
• Hammond Power Solutions: Global manufacturer of dry-type transformers, reactors, and power quality magnetics. Both a supplier (partner) of transformers to American Rotary and a broad incumbent whose transformer lines overlap with American Rotary's transformer offerings.
• Siemens: Global industrial automation and electrical equipment supplier with motor controls, drives, and power distribution products. Competes indirectly through VFDs and motor starters that can substitute for rotary phase conversion in industrial settings.

Others

• Rockwell Automation: Major industrial automation provider whose motor control and power products are sometimes specified in the same industrial facilities that buy phase converters. More of an ecosystem enabler than direct competitor.

Direct peers

• Ronk Electrical Industries: Long-established US manufacturer of phase converters, including rotary and static models, plus electrical equipment for agricultural and industrial markets. Directly comparable product line and customer base to American Rotary.
• Phase Perfect (NAPC): Manufacturer of digital static phase converters under the Phase Perfect brand by North American Power Controls. Most direct competitor to American Rotary's AD/ADX Smart Series, selling to the same machining, woodworking, and agricultural customers.
• Kay Industries: Manufacturer of Phase-Aid static phase converters and Phasemaster rotary phase converters for industrial and agricultural customers. Competes head-to-head with American Rotary across multiple verticals.
• TEMCo Industrial: Distributor and manufacturer of rotary phase converters, transformers, and power quality products. Overlapping product portfolio (especially transformers and rotary converters) targets the same SMB and industrial customer base.

Emerging players

• Yaskawa America: Manufacturer of AC drives, VFDs, and motion control products. A meaningful substitute supplier in CNC and industrial motor applications, where VFDs increasingly displace rotary phase converters.

Market position

Strengths4 records

Weaknesses3 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/AmericanRotary1
• YouTubeyoutube.com/user/AmericanRotary
• Facebookfacebook.com/AmericanRotary
• Instagraminstagram.com/AmericanRotary

Compliance2 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 The American Rotary