What NK Technologies does

NK Technologies (legal name: Neilsen-Kuljian, Inc.) is a privately held US manufacturer of current sensing, power monitoring, and ground fault protection equipment founded in 1982 in San Jose, California. The company designs and assembles its products in the USA and sells over 1,300 SKUs spanning AC and DC current transducers, ground fault relays (AG, AGL, AG-LC, AGV, AGL-MAR series), ground fault transducers (AGT-FL, AGT-FD series), voltage transducers, power transducers, current transformers, current sensing switches, current indicators, and signal converters. Its core technology combines current transformers, Hall effect sensors, and True RMS signal processing to deliver accurate measurement on distorted waveforms from variable frequency drives (VFDs) and SCR outputs, with differentiation in variable frequency drive ground fault detection and large-aperture split-core sensors up to 4.5 inches in diameter for high-current monitoring.

The business serves industrial manufacturers, semiconductor fabs, factory automation integrators, marina operators, renewable energy projects, and commercial kitchen facilities requiring NEC, UL, CE, cULus, RoHS 3, ISO 9001:2015, and ISO 14001:2015 compliant sensing solutions. NK Technologies distributes through a global network of stocking distributors and regional sales representatives across North America, Europe, Asia, Oceania, South America, and South Africa, complemented by US field sales managers covering individual states and a direct Request-for-Quote channel on its website. Revenue is generated via B2B hardware product sales under quote-based pricing with multi-year contracts, supported by a 5-year industry-leading warranty. The company holds no disclosed outside funding and appears to remain under founder/family ownership since its 1982 incorporation.

Name

NK Technologies

Legal name

Neilsen-Kuljian, Inc.

Website

https://nktechnologies.com

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

101–250 employees

Short description

NK Technologies, founded in 1982 in San Jose, California, manufactures over 1,300 current sensing, ground fault, and power monitoring hardware SKUs for industrial automation, semiconductor, marine, and commercial kitchen markets, distributed globally through 16+ stocking distributors and direct US field sales under a 5-year warranty.

Ownership category

akta.pro rank

Product category

Industrial Current Sensing and Power Monitoring Equipment

NAICS

Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Relay and Industrial Control Manufacturing (335314), Electrical Equipment Manufacturing (3353)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Electronic Coils, Transformers & Other Inductors (3677), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Industrial I/O, Signal Conditioning & Remote Terminal Units (RTUs) (IMAGABAD)

akta.pro secondary industry

Motor Control Centers & Motor Protection (Overload Relays, Protection, Monitoring) (IMAGACAI)

Keywords

• Current sensing sensors
• Ground fault protection
• Power monitoring equipment
• Voltage transducers
• Industrial automation sensors

Headquarters

HQ city

San Jose

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Product Sales: NK Technologies manufactures and sells current sensing hardware including AC/DC current transducers, ground fault relays, voltage transducers, power transducers, current transformers, and signal converters. The company offers over 1,300 models serving the industrial and factory automation markets.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels6 records

Core offering

NK Technologies designs, manufactures, and assembles in the USA over 1,300 models of current sensing, power monitoring, and ground fault protection hardware for industrial and factory automation markets. The portfolio includes AC and DC current transducers, voltage transducers, power transducers, current transformers, current sensing switches, current indicators, signal converters, ground fault relays, and ground fault transducers sold through a global distributor network and direct sales representatives.

Product overview

NK Technologies is a manufacturer of current sensing, power monitoring, and ground fault protection equipment. The product portfolio centers on transducers and sensors for industrial automation applications, including AC Current Transducers (AT, ATR, ATP, ATH, ATQ, ATCR series), DC Current Transducers (DT, DLT series), Voltage Transducers (VTR, VTD, VTD-BD, VTU, VT3 series), Power Transducers (APN, APN-R, APS, APT series), Current Transformers (CTRC, ProteCT, CT-MS, CT-LS series), Ground Fault Relays (AG, AGL, AG-LC, AGV series), Ground Fault Transducers (AGT-FL, AGT-FD series), Current Sensing Switches (AS0, AS1, AS3, ASD, ASL, ASM, ASX, ASXP, ATS, DS1, DS3 series), Current Indicators (ACI Series), and Signal Converters (CTC series). Products are designed and assembled in the USA with a 5-year warranty and are used across industrial, commercial, and semiconductor manufacturing applications. The company offers over 1,300 product models serving factory automation markets.

Differentiator

Problem solved

Functional benefit

Brands

• ProteCT™: Current transformer series producing 0–0.333 VAC output, self-powered, available in split-core case with 0.85", 1.25", 2.0" aperture options.
• AMPFlasher™
• PowerBASE™

Products and services

• Ground Fault Relays Ground fault relays that detect current leakage to ground and trigger protective actions such as disconnecting power or sending alarms to control systems. Includes AG, AGL, AG-LC, AGV, and AGL-MAR series variants with different wire bundle diameter capacities and specialized use cases including variable frequency drive and marina applications.
• Ground Fault Transducers Ground fault transducers that measure the level of ground fault current and produce proportional analog output signals (4-20 mA or 0-10 VDC) for monitoring and data acquisition systems. Available in AGT-FL and AGT-FD series with varying aperture sizes for earth leakage detection.
• AC Current Transducers AC current transducers that measure AC current without physical contact to the circuit conductor and produce output signals readable by panel meters, PLCs, or data acquisition systems. Includes AT, ATR, ATP, ATPR, ATH, ATQ, ATCR, and ATS series with various current ranges and output types.
• DC Current Transducers DC current transducers that measure DC current and produce industry-standard output signals for interfacing with panel meters, PLCs, and data acquisition systems. Includes DT, DLT, DT-DL, DT-BB, and DT-FD series supporting currents up to 1200 ADC.
• Voltage Transducers Voltage transducers that measure AC or DC voltage and convert it to proportional analog output signals for monitoring and controlling electrical systems. Includes VTR (AC), VTD (DC), VTD-BD (bidirectional DC), VTU-DIN, VTU-OS, and VT3 series for three-phase monitoring up to 600 VAC.
• Current Sensing Switches Current sensing switches that provide contact changes at minimum or adjustable current levels for status indication and control. Includes AS0, AS1, AS3, ASC, ASD, ASL, ASM, ASP-FD, ASX, ASXP, ATS, DS1, DS3, and DS1-FD series variants.
• Current Indicators (AMPFlasher) AC current indicators that provide visual indication of current flow status. Includes ACI Series AMPFlasher that flashes an LED when current exceeds factory-set thresholds, with indicating ranges from 0.5 A to 100 A and optional remote LED pigtails.
• Power Transducers Power transducers that monitor three-phase and single-phase loads, measuring watts, voltage, and current with Modbus RTU digital output or 4-20 mA analog signals. Includes APN, APN-R, APS, APT, and APT-TH series.
• Current Transformers Current transformers that step down high currents to measurable levels for power monitoring applications. Includes CTRC, ProteCT, CT-MS, CT-LS, and 5 Amp Secondary series with various aperture sizes, including the ProteCT series with 0-0.333 VAC self-powered output in split-core cases with 0.85", 1.25", and 2.0" aperture options.
• Signal Converters Signal converters that convert ProteCT 0.333 VAC or 5A CT input to industry-standard 4-20 mA output. Includes CTC series for signal conversion.
• AGV Series Ground Fault Relay Ground fault relay specifically designed for variable frequency drives, with the ability to detect faults to earth on the load side of VFDs. Features field-selectable 30 mA, 50 mA, or 100 mA setpoints and cULus certification for US and Canadian safety standards.
• AGL-MAR Series Ground Fault Relay Purpose-built ground fault relay specifically designed for marina power safety applications including docking facilities and marina environments.

Quantifiable outcome

• Detection of ground fault current as low as 5mA for personnel protection per NEC requirements
• +1 more outcomes

Named customers2 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

Feature4 records

Partnerships

16 partnerships are on record, tiered core and minor.

• Mod-Tronic Instruments LimitedcoreChannel Partner/ Reseller/ DistributorStocking distributor based in Brampton, Ontario with additional locations across Canada (Montreal, Halifax, Winnipeg, Regina, Calgary, Edmonton, Vancouver). Primary Canadian distribution partner for NK Technologies products.
• CD Nova Ltd.minorChannel Partner/ Reseller/ DistributorDistributor based in Burnaby, BC serving the Canadian market.
• ASIISAcoreChannel Partner/ Reseller/ DistributorExclusive representative for Mexico, headquartered in Monterrey, Nuevo Leon. Contact: Juan Flores.
• LEM SAminorChannel Partner/ Reseller/ DistributorEuropean distribution partner based in Geneva, Switzerland.
• Mc Energy BVminorChannel Partner/ Reseller/ DistributorDutch energy solutions distributor based in Ridderkerk, Netherlands.
• Wesemann BVminorChannel Partner/ Reseller/ DistributorDutch distributor based in Rotterdam specializing in process automation products.
• ShangHai HangOu Mechanical And Electrical Equipment Co., LtdcoreChannel Partner/ Reseller/ DistributorChinese distribution partner based in Shanghai providing sales and support for NK Technologies products in China.
• Xinyi Technology (Beijing) Co., Ltd.minorChannel Partner/ Reseller/ DistributorChinese technology distributor based in Beijing's Chaoyang District.
• TESSOL, Inc.minorChannel Partner/ Reseller/ DistributorKorean distribution partner based in Yongin, Gyeonggi-do, South Korea.
• ELDAC PROCESS AUTOMATIONminorChannel Partner/ Reseller/ DistributorIndian automation partner based in Chennai, Tamil Nadu.
• Viet America Sensor Equipment Co., Ltd. (VASE)minorChannel Partner/ Reseller/ DistributorVietnamese distribution partner based in Bac Ninh Province.
• GREAT DEVELOPMENT INTERNATIONAL CO., LTDminorChannel Partner/ Reseller/ DistributorHong Kong distribution partner serving the Asian market.
• VeederLine Pty. Ltd.minorChannel Partner/ Reseller/ DistributorAustralian distribution partner providing sales and support.
• LRI Industrial Automation BrazilcoreChannel Partner/ Reseller/ DistributorBrazilian industrial automation distributor based in Porto Alegre, RS with toll-free support.
• AMDS4 - Componentes EletronicosminorChannel Partner/ Reseller/ DistributorBrazilian electronics distributor based in Mogi Mirim, Sao Paulo.
• Denver Technical Products PtyminorChannel Partner/ Reseller/ DistributorSouth African technical products distributor.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Eaton: Global power management giant offering current sensors, ground fault protection and power monitoring products within its Electrical Americas business — competes head-on with NK on ground fault relays and current sensing, but bundled with far broader low-voltage equipment portfolios.
• ABB: Swiss-Swedish industrial giant offering a comprehensive range of current sensors, voltage sensors and ground fault devices within its electrification business — competes with NK in industrial and energy verticals, but as part of a much broader portfolio of switchgear, drives and automation.
• Honeywell: Diversified industrial conglomerate with significant presence in sensing and controls, including current and voltage sensing used in process and building automation — overlaps with NK but competes primarily through broader sensing and controls portfolios.
• Schneider Electric: Global energy management and automation major with PowerLogic current/power monitoring and ground fault product lines — competes in industrial power monitoring, but typically through enterprise-level solutions rather than a focused transducer-only portfolio.
• Phoenix Contact: German-headquartered global leader in industrial electrical connectivity, surge protection and signal conditioning — competes against NK in the current transducer and signal conditioner categories as part of a much broader industrial product portfolio serving automation OEMs.

Direct peers

• Carlo Gavazzi: Switzerland-based industrial automation specialist offering current transducers, voltage transducers, current relays and power analyzers — a near-1:1 portfolio overlap with NK Technologies, serving factory automation, HVAC, water/wastewater and similar verticals through a global distributor network.
• CR Magnetics: US-based (St. Louis) manufacturer of current transducers, voltage transducers, current relays/switches and ground fault sensors — directly comparable in product mix, US assembly footprint, and industrial-channel-focused GTM.
• LEM International: Swiss-headquartered, globally leading manufacturer of current and voltage transducers / sensors for industrial, automotive and energy markets — the closest direct competitor to NK Technologies across AC/DC current sensing IP and product lineup. Notably, LEM SA is also listed as an NK distribution partner, indicating direct product overlap.
• AcuAMP (AutomationDirect): US-based current/voltage sensing specialist offering a comparable product line of AC and DC current transducers, current switches and voltage sensors targeting industrial OEMs and panel builders — comparable scale, channel model and customer base to NK Technologies.

Emerging players

• Senva: US-based niche sensor manufacturer offering current switches and a range of building/factory sensing products — partial overlap with NK's current sensing switch and transducer lines, focused on building automation and industrial channels.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/NK-Technologies-233915456663632
• LinkedInlinkedin.com/company/nk-technologies

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 NK Technologies