TCI

What TCI does

TCI (now operating as Allient Milwaukee) is a US-based designer and manufacturer of power quality and harmonic mitigation hardware, founded in 1961 as Trans-coil, Inc. in Milwaukee, Wisconsin and headquartered at W132 N10611 Grant Drive, Germantown, WI. The company produces active harmonic filters (HGA line using DSP controllers and PWM IGBT-based power conversion), a portfolio of passive harmonic filters (HGP, HGL, HSD, HSL, HSE — each addressing different load profiles and capacitance requirements), line reactors (KDR, KLR), sine wave filters (KMG, MSD) supporting motor lead lengths up to 15,000 feet, dV/dt motor protection filters (V1K), industrial control transformers (CPT), power factor correction capacitor banks (PFG), and EMI filters (KRF). Its proprietary PQconnect platform layers Bluetooth, Modbus RTU, and ODVA-certified EtherNet/IP remote monitoring onto passive filters, paired with the PQvision desktop/mobile application for real-time THID/THVD monitoring — functionality the company positions as first-of-its-kind for passive filter hardware.

The company generates revenue through hardware sales to electrical and machinery OEMs (globally), a distributor and manufacturer's representative network spanning North and South America, and direct sales via a quote-based pricing model with net 30 terms for qualified domestic customers. The customer base spans seven industrial verticals: Oil & Gas, HVACR, Water/Wastewater, General Industrial, Irrigation/Agriculture, Food & Beverage, and Elevator/Escalator, with documented end-users including Bakken Field operators, Wisconsin and Virginia municipal pump stations, and the Reading Phillies Stadium HVAC retrofit. Channel partnerships include a formal Rockwell Automation Technology Partner relationship and Canadian distribution through TransFab TMS.

TCI was acquired by Allied Motion Technologies in December 2018; Allied Motion rebranded to Allient (NASDAQ: ALBT) in 2023, and TCI was rebranded to Allient Milwaukee in 2025 while continuing to manufacture the TCI-branded product line. The facility is ISO 9001:2015 certified and BABAA-compliant, supports domestic manufacturing with short lead times, and serves as the company's sole manufacturing and shipping point. The company employs approximately 200 people and holds ISO 9001:2015, RoHS, REACH, ODVA, cULus, CE, ENEC, and CSA certifications across its product portfolio.

Name

TCI

Legal name

TCI, LLC

Website

https://transcoil.com

Company type

Private

Founded year

1961

Operating status

Operating

Headcount range

51–100 employees

Short description

TCI (now Allient Milwaukee) designs and manufactures power quality hardware — active and passive harmonic filters, line reactors, sine wave filters, and motor protection filters — serving industrial OEMs and infrastructure end-users in Oil & Gas, HVAC, water/wastewater, and general industrial sectors.

Ownership category

akta.pro rank

Product category

Industrial Power Quality Equipment

NAICS

Electrical Equipment Manufacturing (33531), Electrical Equipment Manufacturing (3353), Relay and Industrial Control Manufacturing (335314)

SIC

Electrical Industrial Apparatus (3620), Electronic Coils, Transformers & Other Inductors (3677), Power, Distribution & Specialty Transformers (3612)

akta.pro primary industry

Reactive Power & Power Quality Equipment (Capacitor Banks, Reactors, STATCOM/SVC, Harmonic Filters) (IMAGAAAG)

akta.pro secondary industries

EMI/EMC & Filtering Components (Common-mode chokes, filters, shielding materials) (IMAGAJAN), Industrial Control Cabinets & Power Distribution (Panels, Switchgear for Automation) (IMAHAHAK), Instrument Transformers (CTs/VTs) & Sensors (Conventional/Optical) (EUADACAG)

Keywords

• Harmonic mitigation filters
• Power quality solutions
• Industrial control transformers
• Electromagnetic interference filters
• Motor protection components

Headquarters

HQ city

Germantown

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Power Quality Hardware Products: TCI generates revenue through the sale of active harmonic filters, passive harmonic filters, line reactors, sine wave filters, dV/dt filters, EMI filters, power factor correction capacitor banks, and industrial control transformers. Products are sold through distributors, manufacturer's representatives, and direct OEM partnerships. The company manufactures in the USA with short lead times.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

TCI designs and manufactures power quality and harmonic mitigation components for industrial applications. Its product portfolio includes active and passive harmonic filters, line reactors, sine wave filters, dV/dt filters, industrial control transformers, capacitor banks, and EMI filters, sold primarily to industrial OEMs and end-users across multiple verticals.

Product overview

TCI (now Allient Milwaukee) offers a comprehensive portfolio of power quality solutions centered on active and passive harmonic filters, line reactors, motor protection devices, and power factor correction products. The core product line includes the HGA active harmonic filter for system-level harmonic mitigation; the HGP, HGL, HSD, HSL, and HSE passive harmonic filter families with PQconnect remote monitoring capability; the HG7 legacy 7% passive filter; KDR and KLR line reactors; KMG and MSD sine wave filters for motor protection; V1K dV/dt filters; CPT industrial control transformers; PFG capacitor banks; and KRF EMI filters. Supporting the hardware portfolio are the PQconnect connectivity platform for remote monitoring via Modbus RTU/EtherNet/IP and the PQvision software for real-time power quality data visualization. The company also offers 50Hz global solutions for international markets. Products are designed for industrial applications including Oil & Gas, HVAC, Water/Wastewater, Industrial, Irrigation/Agriculture, Food & Beverage, and Elevator/Escalator sectors, with engineering services for custom solutions and harmonic studies.

Differentiator

Problem solved

Functional benefit

Brands

• HarmonicGuard: Product line for active and passive harmonic filters including HGA, HGP, HGL models with PQconnect technology
• HarmonicShield
• MotorGuard
• MotorShield
• PQconnect
• PQvision

Products and services

• Active Harmonic Filters Active electronic filters that detect and inject compensating currents to reduce harmonic distortion in industrial electrical systems, used by OEMs and industrial facilities.
• Passive Harmonic Filters Passive L-C tuned filter units that absorb specific harmonic frequencies to mitigate distortion on industrial power systems.
• Line Reactors Three-phase and single-phase line reactors used to protect variable frequency drives and other equipment from line disturbances and harmonics.
• Sine Wave Filters Output filters installed between a VFD and motor to convert the PWM waveform into a smooth sine wave, reducing motor insulation stress and audible noise.
• dV/dt Filters Filters that limit the rate of voltage rise and peak voltage at motor terminals, protecting motor windings from insulation breakdown caused by fast-switching VFD outputs.
• Industrial Control Transformers Step-down transformers designed for industrial control circuits to supply lower voltages required by control devices and panels.
• Capacitor Banks Power factor correction capacitor banks used in industrial facilities to improve power factor and reduce utility penalties.
• EMI Filters Electromagnetic interference filters that suppress conducted EMI to help industrial equipment meet EMC regulatory requirements.

Quantifiable outcome

• Limits current distortion to less than 5% TDD
• +4 more outcomes

Named customers4 records

Segments7 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

Feature5 records

Partnerships

Three partnerships are on record, tiered core and flagship.

• ODVAcoreTechnology or Integration · 21 June 2022ODVA certified TCI's PQconnect passive harmonic filter technology, enabling seamless EtherNet/IP integration. PQconnect allows ultimate compatibility with EtherNet/IP dependent PLC or HMI devices with implicit messaging for real-time filter status and power quality data.
• Rockwell AutomationcoreGTM or Marketing PartnerRockwell Automation Technology Partner with co-marketing arrangements. TCI's products are marketed through Rockwell's partner ecosystem and display the RA Partner logo.
• Allied Motion Technologies (Allient)flagshipStrategic or Co-development PartnerAcquired by Allied Motion Technologies in December 2018. Allied Motion rebranded to Allient (Allient Nexus Technologies) in 2023. TCI renamed to Allient Milwaukee in 2025 while continuing to manufacture the same TCI products.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• ABB: ABB is a global industrial conglomerate offering power quality solutions, harmonic filters, drives, and switchgear as part of its broad electrification portfolio. Competes with TCI in active and passive harmonic filtering while bundling solutions across drives, motors, and power infrastructure.
• Siemens: Siemens offers active and passive harmonic filters, line reactors, and power quality products through its Smart Infrastructure and Digital Industries divisions. A broad incumbent with extensive global reach competing with TCI in industrial power quality.
• Eaton: Eaton provides harmonic filtering, power factor correction, and power quality solutions within its Electrical Americas segment. A broad incumbent with overlapping product categories serving similar industrial and utility customers as TCI.
• Schneider Electric: Schneider Electric offers power factor correction, harmonic filtering, and power quality solutions as part of its comprehensive energy management and industrial automation portfolio. Competes broadly with TCI across multiple verticals and geographies.
• Delta Electronics: Delta Electronics manufactures power supplies, EMI filters, and active harmonic filters for industrial applications. A broad incumbent with significant Asia-Pacific presence that competes with TCI in active power quality solutions.

Direct peers

• MTE Corporation: MTE Corporation is a direct competitor specializing in passive and active harmonic filters, line reactors, and power quality solutions for industrial VFD applications. Comparable in scale and product focus to TCI, serving the same verticals (HVAC, water/wastewater, oil & gas).
• Schaffner Group: Schaffner manufactures EMI/RFI filters, power quality solutions, and harmonic filters for industrial and railway applications. Directly comparable to TCI's KRF EMI filter and broader power quality portfolio, with similar product overlap in motor protection and harmonic mitigation.

Others

• Rockwell Automation: Rockwell Automation is both a TCI partner and an adjacent player in industrial automation. While not a direct competitor in standalone filters, Rockwell's drives and PACs increasingly incorporate harmonic mitigation, and its PartnerNetwork ecosystem amplifies TCI's reach.

Emerging players

• Enerdoor: Enerdoor specializes in EMI/RFI filters, harmonic filters, and power quality solutions for industrial automation. A smaller specialist competitor comparable to TCI in product focus and target customer base, particularly in European markets.

Regional players

• Invertek Drives: Invertek Drives manufactures variable frequency drives with built-in harmonic mitigation features, primarily serving EMEA markets. A regional player whose integrated approach to harmonic control represents an emerging competitive vector for TCI's standalone filter business.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedIntranscoil.com/linkedin
• Xx.com/transcoil

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 TCI