Soken Electric

What Soken Electric does

Soken Electric Co., Ltd. (総研電気株式会社) is a privately held Japanese manufacturer and distributor of electronic measuring instruments for high-voltage electrical equipment, founded in June 1974 and headquartered in Chofu City, Tokyo, with a regional sales office in Osaka. The company designs and builds precision test and diagnostic instruments used for insulation evaluation, partial discharge detection, dielectric loss tangent (tan δ) measurement, winding resistance testing, instrument transformer error testing, and watt-hour meter calibration. Its core proprietary technologies include the HOT LINE live-line winding resistance measurement system — which uses DC superposition with AC filter circuits to measure coil resistance while equipment remains energized — and the Frequency Domain Insulation Diagnosis (FIND) system, which evaluates insulation condition from frequency characteristics without requiring historical baseline data. Soken also serves as the exclusive Japan sales agent for four international manufacturers: PHENIX TECHNOLOGIES (USA, high-voltage test equipment), CHAUVIN ARNOUX (France, insulation and grounding diagnostics), DELTATRONIC TECHNOLOGY (Austria, insulating oil breakdown testers), and PRODYN TECHNOLOGIES (USA, high-frequency CTs and EMP/EMC/EMI sensors).

The company monetizes primarily through hardware sales of own-manufactured instruments and distributed international brands, complemented by a repair, inspection, and calibration service business (basic technical fee of 28,000 yen/hour plus parts, with calibration certificates at 3,000 yen each and test reports at 4,000 yen each). Go-to-market is sales-led and direct: a Tokyo sales department and an Osaka sales office handle quotes and technical consultation, with a separate technical department and repair/calibration department providing after-sales support. The company markets through a Japanese-language website with digital flipbook and PDF product catalogs, and participates in the TECHNO-FRONTIER industry exhibition. Target customers span electrical equipment manufacturers (motors, cables, transformers, switchgear, bushings) performing factory QA, EV/HEV motor and heat pump compressor manufacturers requiring live-line temperature measurement for efficiency verification, and power utilities and industrial facilities operating high-voltage rotating machinery for preventive maintenance. Soken employs between 11 and 50 people, has registered capital of 30 million yen, and is led by President Mitsunaga Sato.

Name

Soken Electric

Legal name

総研電気株式会社 (Soken Electric Co., Ltd.)

Website

https://soken-jp.com

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

11–50 employees

Short description

Soken Electric is a Tokyo-based manufacturer and exclusive Japan distributor of high-voltage electrical measuring instruments — including live-line winding resistance meters, partial discharge detectors, and tan δ testers — serving electrical equipment makers, EV/HEV motor OEMs, and power utilities.

Ownership category

akta.pro rank

Product category

Electrical Test & Measurement Equipment

NAICS

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

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Industrial Instruments For Measurement, Display, And Control (3823), Services-Testing Laboratories (8734)

akta.pro primary industry

Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches) (IMAGAFAC)

akta.pro secondary industries

Electrical Testing & Certification (Protection Relays, Switchgear, Transformers) (EUAEAHAG), Test, Measurement & Calibration Equipment Manufacturing Services (ATE, DAQ, metrology electronics) (IMAGAGAH)

Keywords

• Electrical measuring instruments
• High voltage testing
• Insulation diagnosis equipment
• Partial discharge detection
• Resistance measurement

Headquarters

HQ city

Chofu

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Measurement Instrument Sales: Manufacture and sale of electronic testing and measurement instruments including high-voltage test equipment, insulation diagnosis systems, partial discharge detectors, and resistance measurement devices.
2. Repair and Calibration Services: Technical support services including repair, inspection, and calibration of measurement instruments. Pricing: basic technical fee of 28,000 yen per hour plus parts and calibration fees.
3. International Product Distribution: Import and distribution of overseas manufacturers' products as exclusive Japan sales agent, including Phenix Technologies (USA), Chauvin Arnoux (France), Deltatronic (Austria), and Prodyn Technologies (USA).

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Soken Electric manufactures and sells electronic measuring instruments for electrical equipment testing, including high-voltage test equipment, insulation diagnosis systems, partial discharge detectors, and live-line winding resistance measurement devices. The company also serves as the exclusive Japan sales agent for four international manufacturers (Phenix Technologies, Chauvin Arnoux, Deltatronic Technology, and Prodyn Technologies), distributing their products through its established customer network.

Product overview

Soken Electric (総研電気株式会社) manufactures and distributes electronic measuring instruments for electrical equipment testing. The company operates as both a product manufacturer and authorized distributor of international brands (Phenix Technologies, Chauvin Arnoux, Deltatronic, PRODYN Technologies). The core product portfolio centers on electrical insulation testing and diagnosis equipment including: HOT LINE live-wire winding resistance measuring instruments for measuring coil temperature during operation; partial discharge (PD) measuring instruments and online monitoring systems for detecting insulation degradation; dielectric loss tangent (tanδ) testing equipment including frequency domain insulation diagnosis devices, automatic Schering bridges, and precision bridges for capacitance and tanδ measurement; resistance measuring instruments including micro-ohmmeters and low resistance meters; insulation diagnostic instruments for evaluating insulation condition; AC/DC hipot testers and kilovoltmeters for high voltage withstand testing; current and magnetic sensors including oscilloscope probes, current clamps, and PRODYN high-frequency CTs and electromagnetic sensors; magnetic characteristics testing equipment for electromagnetic steel sheets; and instrument transformer error testing equipment. The company also distributes imported products from Chauvin Arnoux (megohmmeters, ground resistance testers), Deltatronic (insulating oil test equipment), and PRODYN (high-frequency sensors for EMP/EMC/EMI applications).

Differentiator

Problem solved

Functional benefit

Products and services

• HOT LINE Series - Live Wire Winding Resistance Measuring Instruments Measures winding resistance of electrical machine coils while equipment is energized (live wire condition), enabling accurate temperature measurement without shutdown. Includes DAC-HRI-3N/DAC-HRI-3N TYPE 700 for inverter-driven equipment, DAC-HRE-1 for general coil testing, and DAC-HRT-1 with temperature measurement capability.
• Partial Discharge (PD) Measuring Instruments Devices that detect and measure partial discharge in insulation materials, a precursor to insulation breakdown. Includes online monitoring systems (DAC-PD-10), digital analyzers (DAC-PD-9A), portable testers (DAC-PD-7/DAC-PD-7P), and laboratory instruments (DAC-PD-3).
• Dielectric Loss Tangent (tanδ) Testing Equipment Instruments for measuring dielectric loss tangent (tanδ) and capacitance of insulation materials. Includes frequency domain insulation diagnosis (DAC-FIND-2), automatic tanδ measuring systems (DAC-ASM-7, DAC-5035), automatic Schering bridges (DAC-ASC-5, DAC-ASM-5C), precision bridges (DAC-PSC-UA, DAC-PSC-20W), micro tanδ meters (DAC-MD-1), and high/low frequency tanδ meters (DAC-HFM-1, DAC-LFM-3).
• Resistance Measuring Instruments Low resistance measuring instruments including digital micro-ohmmeters (DAC-MRG-2, DAC-MR-2U), low resistance meters (DAC-MR-50B, DAC-MR-100B), and large transformer resistance meters (DAC-MR-50L) for measuring winding resistance of motors, transformers, and cable conductors.
• Insulation Diagnostic Instruments Instruments for diagnosing insulation condition including automatic insulation degradation diagnostic systems (DAC-MAT-5), lightning arrester leak current testers (DAC-LAS-3A), live insulation diagnostic devices (DAC-HT-5S), high voltage insulation meters (DAC-HIT-3), and high voltage insulation diagnostic systems (DAC-6017).
• AC/DC High Voltage Hipot Testers

Quantifiable outcome

• Significantly faster large transformer winding resistance measurement through 150V output and saturation technique
• +1 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• PHENIX TECHNOLOGIES (USA)coreChannel Partner/ Reseller/ DistributorAmerican manufacturer headquartered in Maryland specializing in high-power testing equipment. Provides AC dielectric strength test equipment, coupling capacitors, and DC hipot testers. Soken Electric serves as exclusive Japan sales agent, offering products ranging from 5kV to 200kV AC and 40-160kV DC test equipment.
• CHAUVIN ARNOUX (FRANCE)coreChannel Partner/ Reseller/ DistributorFrance's largest measuring instrument and control equipment manufacturer. Products include insulation diagnosis devices, grounding diagnosis devices, megohmmeters, and oscilloscope current probes. Soken Electric distributes these products throughout Japan.
• DELTATRONIC TECHNOLOGY (AUSTRIA)minorChannel Partner/ Reseller/ DistributorAustrian manufacturer of electrical oil dielectric breakdown voltage testers. The PORTATEST series has numerous installations in Japan and can perform oil breakdown tests compliant with various international standards.
• PRODYN TECHNOLOGIES (USA)coreChannel Partner/ Reseller/ DistributorNew Mexico-based company founded in 1981, specializing in R&D and manufacturing of high-frequency CTs for EMP, EMC, and EMI applications. Products include split-type high-frequency CTs, electric flux density sensors, magnetic flux density sensors, and baluns.

Scale indicators2 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• OMICRON electronics: Austria-based global leader in testing, diagnostics and monitoring of electrical assets including transformers and protection equipment. Directly comparable to Soken's insulation diagnosis and HV testing portfolio serving utilities and OEMs.
• Megger Group: UK-headquartered specialist in insulation testing, low-resistance measurement and electrical asset diagnostics. Strongly overlaps with Soken's micro-ohmmeter, megohmmeter and tan δ product lines sold to utilities and equipment manufacturers.
• Phenix Technologies: US high-power test equipment manufacturer (5–200kV AC, 40–160kV DC) and Soken distribution principal. Soken is their exclusive Japan channel; in other geographies Phenix sells directly against Soken's own HV instruments.
• Hioki E.E. Corporation: Japanese manufacturer of electrical measuring instruments including power meters, insulation testers and current sensors. Direct domestic peer competing in many of the same Japanese industrial and utility accounts as Soken.
• Kikusui Electronics: Japanese manufacturer of power electronics test equipment including AC/DC hipot testers and electronic loads. Overlaps with Soken's HV withstand testing portfolio for motor and transformer manufacturers.
• Doble Engineering: US provider of diagnostic instruments and services for electrical apparatus including transformers and insulating materials. Closely comparable to Soken's PD detection, tan δ testing and insulation diagnostic instruments targeting power utilities.
• HAEFELY AG: Swiss specialist in high-voltage test and measurement systems for transformers, cables and switchgear. Closely comparable product overlap with Soken's AC/DC hipot, coupling capacitor and tan δ testing equipment.
• Chauvin Arnoux: France's largest measuring instrument manufacturer and one of Soken's distribution principals. Competes directly with Soken in megohmmeters, ground resistance testers and insulation diagnostics across overlapping end markets.

Broad incumbents

• Keysight Technologies: Global test and measurement incumbent with oscilloscopes, signal analyzers and electrical test solutions. Adjacent competitor to Soken's bench/handheld electrical measurement and current probe product lines, especially in lab and R&D settings.
• Yokogawa Electric: Large Japanese industrial conglomerate with a broad test & measurement and industrial process instrumentation portfolio. Overlaps with Soken in power/energy measurement and industrial sensors but at much greater scale and breadth.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

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 Soken Electric