Magnelab

What Magnelab does

Magnelab is a privately-held U.S. manufacturer of magnetic components founded in 1968 by Carl Forsberg in Boulder, Colorado, now operating from a state-of-the-art manufacturing facility in Longmont, Colorado (originally under the name Magnetek). The company designs and produces custom and standard current transformers, Rogowski coils, split-core and solid-core current sensors, Hall effect DC sensors, voltage transducers, and high-voltage isolation transformers, with a measurement range spanning 0.5A to 15,000A and frequency response up to 500 MHz. Its product portfolio is organized into AC Current Sensors, DC Current Sensors, Electronic Designs (integrators and amplifiers), High Frequency Sensors, and Customized Sensors, with patented technology (US 9053852 B2) covering its RGS-0750 Revenue Grade AC Current Sensor System that improves CT accuracy from ±1% to ±0.2% (IEC 61869-2 Class 0.2), and a Patent Pending Liquid Salinity Sensor enabling contactless measurement of liquid salinity.

The company monetizes primarily through unit-priced hardware sales of catalog products (e.g., SCT, RCT, UCT, DCT, MCT, MGT, MGS series) sold directly via magnelab.com and through authorized resellers such as ventronicspower.com, plus custom design and engineering services for OEM applications spanning connector installation, lead length, voltage output, and amperage rating customization. Pricing is quote-based and not publicly disclosed. Customers include power metering companies (eGauge, Measurlogic, Veris), surgical generator manufacturers, data center operators, EV charging infrastructure operators, defense contractors, and R&D labs across more than 2,000 actively purchasing accounts. The firm is ISO 9001:2015 certified, holds UL, UL 2808, IEC 61869-2, IEEE C57.13, CE, RoHS, and CSA certifications, and appears to remain under founder/family ownership with no disclosed external venture or private equity investment.

Name

Magnelab

Legal name

Magnelab

Website

https://magnelab.com

Company type

Private

Founded year

1968

Operating status

Operating

Headcount range

101–250 employees

Short description

Magnelab is a privately-held U.S. manufacturer founded in 1968 that designs and produces custom and standard magnetic components, including current transformers, Rogowski coils, and voltage transducers, serving power metering, medical, data center, EV charging, defense, and R&D customers.

Ownership category

akta.pro rank

Product category

Current Transformers

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

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

akta.pro primary industry

Transformers & Magnetics (Power/Signal) (HDAHANAD)

akta.pro secondary industries

Inductors & Coils (Power/RF/Chokes) (HDAHANAC), Magnetic Sensors (Hall/Magnetoresistive/Compass) (HDAHALAC), Passive Components (Resistors, Capacitors, Inductors, Ferrites) (IMAGAJAA)

Keywords

• Current transformers
• Magnetic sensors
• Rogowski coils
• Power monitoring
• Revenue grade metering

Headquarters

HQ city

Longmont

HQ country

United States

HQ region

North America

Offices1 record

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. Hardware Sales - Current Transformers: Magnelab designs and manufactures high quality custom and standard magnetic components including current transformers, Rogowski coils, split-core sensors, solid-core sensors, and voltage transducers. Products are sold directly and through resellers.
2. Custom Design Services: Engineering services for custom magnetic designs. The engineering team designs challenging custom projects. Custom options available include custom connector installation, longer lead length, unique voltage output, and custom amperage ratings.
3. Electronic Designs: Integrators and amplifiers for current measurement systems. Products include voltage transducers, current transducers with 4-20mA output, and voltage isolated transformers.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels2 records

Core offering

Magnelab designs and manufactures custom and standard magnetic components including current transformers, Rogowski coils, split-core sensors, solid-core sensors, and voltage transducers. The company serves industries such as medical, computer, electrical management, power monitoring, and military/defense with products spanning 0.5A to 15,000A measurement ranges. Magnelab also provides custom magnetic design engineering services and was the first U.S. manufacturer of Rogowski Coils.

Product overview

Magnelab is a current transformer manufacturer founded in 1968, offering a comprehensive portfolio of magnetic measurement products. The product line centers on current sensors and transformers organized into five main categories: AC Current Sensors (split-core, solid-core, and Rogowski coils), DC Current Sensors (Hall effect technology), Electronic Designs (voltage transducers, integrators, and signal conditioners), High Frequency Sensors (up to 500 MHz), and Customized Sensors. Key product families include the SCT series split-core transformers (SCT-0200 through SCT-3000), RCT/RCS series flexible Rogowski coils (RCT-1200 through RCT-4800 in various configurations including UL-listed variants), UCT series revenue-grade solid-core transformers, DCT series DC voltage output sensors, MGT/MCT/MGS series 4-20mA output transducers, and the 3304-xxx high voltage isolation transformers for medical applications. The company also provides specialized systems including the RGS-0750 revenue grade sensor system (patented technology) and the DVT series DC voltage transducers. Magnelab was the first U.S. manufacturer of Rogowski coils and serves industries including medical, computer, electrical management, power monitoring, and military applications. All products are backed by warranties ranging from 5-10 years and most are made in the USA.

Differentiator

Problem solved

Functional benefit

Products and services

• SCT Series Split-Core Current Transformers A family of split-core AC current transformers (including SCT-0200, SCT-0400, SCT-0750, SCT-1250, SCT-2000, SCT-3000, SCT-075C, SCT-125C, and UL-listed variants) that convert AC input current to a 0.333V output. Used for power monitoring, energy management, and retrofit installations on existing conductors. Amperage ratings range from 10A to 3000A.
• RCT Series Flexible Rogowski Coils A family of flexible rope-like Rogowski coil current sensors (including RCT-1200, RCT-1800, RCT-2400, RCT-3600, RCT-4800, RCT-180L UL-listed, RCT-180C, RCT-350T teardrop, and RCT-35SW switch-gear models) measuring AC current up to 15,000 amps with 0.5% linearity accuracy. Magnelab was the first U.S. manufacturer of Rogowski Coils.
• RCS / MGS Three-Phase Rogowski Coil Systems Three-phase flexible current sensor systems (RCS-1200, RCS-1800, RCS-2400, RCS-5A series, MGS-1200, MGS-1800, MGS-2400) integrating three Rogowski coils with a DIN rail integrator. Provide 0.333V AC or 4-20mA DC outputs for 250A to 5000A three-phase power monitoring applications.
• UCT Series Revenue-Grade Solid-Core Current Transformers Solid-core AC current transformers (UCT-0300, UCT-0500, UCT-0750, UCT-1250, UCT-0350-050 UL-listed) meeting IEC 61869-2 revenue-grade accuracy class (Class 0.2 to Class 1.0). Measure 5A to 400A ranges with 0.5% linearity accuracy and phase displacement under 0.085 degrees.
• DCT Series DC Current Sensors Split-core DC current sensors using Hall effect technology (DCT-0010, DCT-0016, DCT-0024, DCT-0036). Convert AC input (0-600A) to 0-5Vdc or 0-10Vdc output. Used in pumps, HVAC, refrigeration, lighting, and other DC monitoring applications with 2% full-scale accuracy.
• ACT Series 5A Output Current Sensors Split-core AC current sensors (ACT-0024, ACT-0036, ACT-0141, ACT-0024-100/1) that transform 100-2400A AC input to 5A or 1A output. Used in power meters, switch gear, and control panels with Class 0.5 to Class 3 accuracy.
• MCT/MGT/MGC Series 4-20mA and 5A Output Transducers Current sensors with industry-standard 4-20mA loop output or 5A output (MCT-0016, MCT-0024, MGT-0420, MGC-1000). Convert AC input (5-300A) to 4-20mA DC loop output with +/-2% accuracy. True RMS measurement devices suited for distorted waveforms and process control integration.
• HFCT High Frequency Current Transformer High-frequency current transformer with broad frequency response from 0.5 Hz to 500 MHz. Handles current pulses of 200 to 20,000 amps for laser research, EMC/EMI testing, lightning simulation, capacitor discharge, plasma processing, and semiconductor gate switching applications.
• DVT Series DC Voltage Transducers DIN-rail mounted isolated DC voltage transducers (DVT-1000-420 and related models). Convert 15-1500 Vdc input to 4-20mA, 0-1Vdc, or 0-5Vdc output. Used for solar string voltage monitoring, battery monitoring, and DC power management. Conforms to CSA C22.2 No. 61010.
• 3304-xxx High Voltage Isolation Transformers High voltage isolation transformers designed for hi-pot testing of surgical generators. Provide 10,000V isolation for patient safety with turns ratios from 1:1.1 to 1:10. Drive surgical generators used in medical applications worldwide.
• RGS-0750 Revenue Grade Current Sensor System Three-phase split-core revenue grade current sensor system with patent-protected active pass-through circuit technology (US 9053852 B2). 0.75-inch opening, 5-150A ratings, accuracy class 0.3 for IEEE C57.13, covered by 10-year warranty. Improves standard CT accuracy from +/-1% to +/-0.2%.
• SPT Series Potential Transformers Potential transformer (SPT-0375) with 115-460VAC input to 0.333VAC output. Phase angle less than 1 degree with 2,500Vrms primary-secondary isolation. Used for voltage measurement and step-down in power monitoring applications.
• Custom Magnetic Component Design Services Engineering design services for custom magnetic components. The Magnelab engineering team designs challenging custom projects with options for custom connector installation, longer lead length, unique voltage output, and custom amperage ratings. Orders fulfilled from a handful of custom parts to large orders with many thousands of parts.

Quantifiable outcome

• Industry-leading 0.5% linearity accuracy on Rogowski coils
• +3 more outcomes

Named customers3 records

Segments6 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• LEM: LEM is a global leader in current and voltage transducers based on Hall effect and fluxgate technologies, serving power conversion, traction, industrial automation, and renewable energy. Directly comparable to Magnelab in product category (current transducers and Rogowski-style flexible coils) and end markets including EV charging and renewable energy, though LEM operates at significantly larger scale.
• CR Magnetics: CR Magnetics manufactures current transformers, voltage transducers, and power monitoring sensors for industrial automation and energy management. Closely aligned with Magnelab in product offering (split-core, solid-core CTs, Rogowski coils, 4-20mA transducers) and target customer base, operating at a similar privately held, mid-market scale.
• Veris Industries: Veris Industries manufactures current transformers, power meters, and environmental sensors for building automation and energy management. Listed as a Magnelab customer (using Magnelab coils in their meters), but also a direct competitor in standalone current sensing products for the same submetering channel.

Broad incumbents

• ABB: ABB is a global electrification and automation incumbent offering instrument transformers, current/voltage sensors, and power monitoring solutions through its Electrification business. Overlaps with Magnelab in industrial current measurement but as part of a much broader portfolio spanning switchgear, drives, robotics, and grid infrastructure.
• Schneider Electric: Schneider Electric offers current transformers, power meters, and energy management solutions through its Industrial Automation and Energy Management businesses. Magnelab's coils are integrated into metering products sold in adjacent channels, and Schneider represents both a competing supplier and potential upstream partner.
• Eaton: Eaton manufactures electrical components including instrument transformers, current sensors, and power quality monitoring products across industrial, utility, and data center verticals. Comparable to Magnelab in industrial-grade current measurement applications but with broader scope and substantially greater scale.
• Siemens: Siemens offers current and voltage measurement instruments through its Smart Infrastructure and Digital Industries divisions, serving industrial automation, building technologies, and energy markets. Overlaps with Magnelab in revenue-grade metering and power monitoring but operates globally with much broader product breadth.
• Phoenix Contact: Phoenix Contact manufactures current transformers, signal conditioners, and measurement transducers for industrial automation and control panel applications. Directly comparable to Magnelab in split-core CT form factors and 4-20mA output signal conditioning, particularly relevant to Magnelab's MGT/MCT series products.
• TDK (including TDK-Micronas): TDK produces magnetic components including current sensors based on TDK-Micronas Hall-effect technology and EPCOS ferrite-based inductors. Competes with Magnelab in current sensing at the semiconductor/integrated level rather than discrete coil level, representing both a competitive threat and a possible strategic acquirer.

Emerging players

• Allegro MicroSystems: Allegro MicroSystems is a leading supplier of Hall-effect integrated circuits and magnetic sensor ICs for current sensing in automotive, industrial, and consumer applications. Represents the semiconductor-based alternative to Magnelab's discrete Hall effect and CT products, with ongoing improvements in accuracy threatening to displace magnetic components in lower-current applications.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/magnelabinc
• Facebookfacebook.com/magnelabinc
• LinkedInlinkedin.com/company/magnelab-inc.

Compliance10 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 Magnelab