Daiichi

What Daiichi does

Daiichi Electronics Co., Ltd. (株式会社第一エレクトロニクス) is a Japanese private manufacturer of electrical measurement instruments, founded in 1947 by Katsusaburo Nakabayashi and headquartered in Adachi-ku, Tokyo, with manufacturing in Isumi City, Chiba. The company designs and produces a comprehensive portfolio spanning digital meters (LC series, SQLC super multi-meters), analog indicating instruments (L/PK/LK/FK/PD/F series), protection relays (DMR-Pro multi-relay, DRPR-72/DVRR-72 for solar, DLOR-110 leakage/overload), transducers (QT2-500 and HSQT2-500 multi-transducers, 90 series, Fine series plugins), controllers (AVR-200 voltage regulator, ASY-96 synchronizer, LC300/310/320 loop controllers), surge protective devices (DA/DA2/DA3), annunciators (FSA-110), switchgear control units (FSC-110), and detector series. Core technology is grounded in signal processing, power measurement, protective relay systems, transducer design, and industrial automation control, with products compliant with IEC 60688:2012, IEC 62053:2003, JIS C 1111:2019, and JIS C 5381-11:2014, and supporting Modbus RTU/TCP, CC-Link, J.NET, and Protocol A communications.

The company serves industrial plants/factories, power generation and utilities (substations, digital substations), railway/transportation, solar power generation, and electrical construction industries, addressing needs for power monitoring, energy management, protective relaying, substation automation, and reverse-power protection. Differentiators include integration of protection/measurement/control into compact form factors (e.g., DIN72×72mm DRPR-72), high-speed response (HSQT2-500 at 30ms), and nearly 80 years of domain specialization. Daiichi also offers OEM/custom product manufacturing services and an after-sales repair business.

Revenue is generated through B2B hardware sales distributed via a nationwide network of 100+ authorized dealers and trading companies (Inaba Denki Sangyo, Suzuki Den, Nihon Denkei, Fuji Electric Technica, and others) covering all Japanese regions from Hokkaido to Kyushu, with direct sales offices in Tokyo and Kyoto supporting dealer and OEM/custom inquiries. Pricing is quote-based through dealers with catalog reference pricing; OEM/custom work is negotiated directly. The company has been family-controlled across three generations of the Nakabayashi family with no external VC, PE, or institutional capital, has never been publicly listed, and is currently in its 71st fiscal period ending March 2026. Operations are certified under ISO 9001:2015 (recertified October 2025) and ISO 14001:2015, and headquartered at approximately 193 employees.

Name

Daiichi

Legal name

Daiichi Electronics Co., Ltd.

Website

https://daiichi-ele.co.jp

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

101–250 employees

Short description

Daiichi Electronics is a family-owned Japanese manufacturer, founded 1947, producing electrical measurement instruments, protection relays, transducers, and control devices for utilities, industrial plants, railways, and solar power applications, distributed through a nationwide dealer network across Japan.

Ownership category

akta.pro rank

Product category

Electrical Measurement Instruments

NAICS

Relay and Industrial Control Manufacturing (335314), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Electrical Equipment Manufacturing (3353)

SIC

Electrical Industrial Apparatus (3620), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Electromechanical Components (Relays, Switches, Potentiometers, Encoders) (IMAGAJAB)

akta.pro secondary industries

Renewable Monitoring, Controls & SCADA Hardware Manufacturing (Sensors, RTUs, Meters) (EUAMAHAJ), Medium-Voltage Distribution Components (MV breakers, disconnects, reclosers, MV terminations & joints) (IMAGAEAL)

Keywords

• Electrical measurement instruments
• Protective relays
• Power monitoring systems
• Analog indicating meters
• Industrial transducers

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices4 records

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. Measurement Instruments Sales: Sale of digital meters, analog meters, transducers, controllers, protective relays, and related electrical measuring equipment. Products sold through dealers and direct sales with catalog pricing.
2. OEM/Custom Products: Custom product development and manufacturing based on customer specifications. Long-standing experience in measurement technology supporting tailored solutions for specific applications.
3. After-sales Service and Repair: Repair and maintenance services for company's measurement instruments and electrical equipment.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Daiichi Electronics designs, manufactures, and sells electrical measurement instruments, protective relays, transducers, controllers, and analog/digital meters for power systems. Its portfolio spans digital multi-relays, multi-transducers, automatic voltage regulators, surge protective devices, and OEM/custom measurement products. The company serves industrial plants, power utilities, railways, solar generation, and electrical contractors, primarily in Japan through an authorized dealer network and direct sales offices.

Product overview

Daiichi Electronics is a comprehensive measurement instrument manufacturer offering a broad portfolio of electrical measurement, control, protection, and monitoring products. The core product lines include: (1) Digital multi-relay DMR-Pro series — protection, control and measurement integrated relays for power receiving/transforming equipment and electric railways; (2) Multi-transducers — QT2-500 and HSQT2-500 high-speed multi-transducers for power system monitoring and control, compliant with IEC 60688 and IEC 62053; (3) Protection relays — DRPR-72, DVRR-72, and DLOR-110 compact relays for solar power generation and low-voltage circuit protection; (4) Electronic LCD meters — LC/S-LC series including SQLC-110LU multi-function meters and SQLC-72L DIN72 compact meters; (5) Analog meters — L, PK, LK, FK, PD, F series wide-angle, square, oblong, picture-frame, and DIN/edgewise meters; (6) Control devices — AVR-200 automatic voltage regulators, ASY-96 synchronizers, loop controllers LC300/LC310/LC320, and switchgear control units; (7) Transducers — 90 series box transducers, Fine series compact plug-in transducers, and plug-in transducers; (8) SPD/surge protective devices — DA/DA2/DA3 series for signal and power line surge protection; (9) Annunciators — FSA-110 for fault display; (10) Detectors — T-63/T-70/T-80/104/105 series for various detection needs. The company also offers OEM/custom manufacturing services, user page access for software downloads and manuals, and software license key issuance. All products are managed under ISO 9001:2015 certified quality management system.

Differentiator

Problem solved

Functional benefit

Products and services

• DMR-Pro Series Digital Multi-Relay (DMR-Proシリーズ デジタルマルチリレー) Digital multi-relay integrating protection, control, and measurement in a single unit for power receiving and transforming equipment. Supports multiple protection elements (overcurrent 50/51, ground fault directional 67, undervoltage 27, overvoltage 59, ground overvoltage 64, ground overcurrent 51G, phase reversal 47, voltage establishing 84). Available in 7 models for general industrial and electric railway applications with communications via Modbus RTU, CC-Link, J.NET, or Protocol A.
• QT2-500 Multi-Transducer (マルチトランスデューサ) International standard-compliant multi-transducer that connects to a single circuit to measure current, voltage, active power, reactive power, power factor, frequency, power flow, and harmonics. Outputs via analog, RS-485 communication, and electric energy pulse simultaneously for power system centralized monitoring.
• HSQT2-500 High-Speed Multi-Transducer (高速マルチトランスデューサ) High-speed multi-transducer with fastest 30ms response for high-speed control applications such as power supply-demand adjustment systems. CE marked, compliant with IEC 60688:2012 and IEC 62053:2003. Features USB Type-C for PC software configuration and OLED display.
• DRPR-72 Digital Reverse Power Relay (ディジタル逆電力リレー) Compact reverse power relay (RPR) and underpower relay (UPR) combined with multi-meter in DIN72×72mm housing for solar power generation equipment. Provides 100ms response time for load-following control in self-consumption solar systems.
• DVRR-72 Digital Ground Fault Overvoltage / Reverse Power Relay (ディジタル地絡過電圧・逆電力リレー) Integrated protection relay combining reverse power relay (RPR), overvoltage ground relay (OVGR), multi-meter, and backup power for solar power generation equipment. Supports various zero-phase voltage inputs via ZPD or EVT.
• DLOR-110 Digital Leakage / Overload Relay (ディジタル漏電・過負荷リレー) Digital relay for leakage current and overload protection and monitoring in low-voltage circuits. Combines leakage relay, thermal relay, and electrical parameter measurement in one unit. Supports 440V direct connection without transformer.
• LC Series / S-LC Series Electronic LCD Meters (電子式液晶メータ) Electronic LCD meter series including super multi-meters, maximum/minimum super multi-meters, three-phase current/voltage meters, DC receiver meters, and DC input meters. Supports various communication protocols and output options for power monitoring applications.
• SQLC-110LU Electronic Super Multi-Meter (電子式スーパーマルチメータ) Top-of-line electronic super multi-meter adding PC setting function to SQLC-110L. USB connection enables easy writing and reading of setting values. Supports wide-range CT compatibility, 400Hz input, Modbus RTU, CC-Link, Anywire, and Protocol A communication.
• AVR-200 Automatic Voltage Regulator (自動電圧調整器) Digital automatic voltage regulator controlling AC generator voltage by regulating field winding current. Supports voltage control, cross-current compensation, field current control, power factor control, and reactive power control. Ethernet (Modbus TCP) enabled for remote control and monitoring.
• LC300 / LC310 / LC320 Loop Controllers (ループコントローラ) Loop controller capable of controlling 2 loops per unit, with up to 4 control blocks. Features touch-panel color LCD, IP55 dust/water resistance. LC320 supports Modbus TCP communication.
• Fine Series Small Plug-in Transducers (Fineシリーズ 小形プラグイン トランスデューサ) Compact plug-in transducer series including AC transducers, signal transducers, sensor transducers, alarm setters, pulse isolators, communication units (FCTT, FCBI), and multi-base units (FWBA). High insulation voltage (AC2000V), wide range of input/output configurations, used widely in industrial instrumentation.
• 90 Series Box Transducers (90シリーズ トランスデューサ) Box transducer series including AC transducers (standard and model B with AC/DC free power), signal transducers, sensor transducers, and power flow transducers. Model B compliant with JIS C 1111:2019 and IEC 60688:2012 with CE marking.
• DA / DA2 / DA3 Series Surge Protective Devices (SPD / 避雷器) Surge protective devices for signal and power lines. DA2 series for low-voltage power and signal lines with operation display and alarm contacts. DA3 series for communication and signal lines. Compliant with JIS C 5381 standards.
• FSA-110 Annunciator (アナンシエータ) 110mm size annunciator aggregating 8 circuits of fault/status display from protection relays. OLED display with setting guidance. Optional CC-Link communication output for central monitoring.
• FSC-110 Switchgear Control Unit (開閉器制御ユニット) 110mm size switchgear control unit combining switchgear control and annunciator functions. Supports direct front switch control or CC-Link communication for remote operation. OLED display with setting guidance.
• ASY-96 Automatic Synchronizer (自動同期投入装置) Automatic synchronizer for generator paralleling. Checks synchronization conditions and controls circuit breaker closing for safe generator synchronization.
• Analog Indicating Electrical Meters - L / PK / LK / FK / PD / F Series (指示電気計器) Analog indicating electrical instruments including wide-angle (L series), square (PK series), oblong (LK series), picture-frame (FK series), DIN (PD series), and edgewise (F series) meters. Available as AC/DC current/voltage meters, power meters, power factor meters, frequency meters.
• Monitor Relays and Detector Series - T-63 / T-70 / T-80 / 104 / 105 (モニタリレー・各種検出器) Detector series including AC detectors, DC detectors, three-phase open-phase reverse detection, rotation detectors, ground resistance detectors, high-precision frequency detectors, DC voltage detectors, and power flow detectors for various industrial monitoring applications.
• OEM / Custom Manufacturing Service (OEM・受託・カスタム製品サービス) Custom/OEM product manufacturing service leveraging decades of measurement technology experience. Accepts inquiries via dedicated form for tailored measurement, control, or protection solutions based on customer specifications.

Quantifiable outcome

• DMR-Pro achieves up to 4 protection elements in single unit, reducing panel space and installation costs
• +3 more outcomes

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eight partnerships are on record, tiered core and major.

• Inaba Denki Sangyo Co., Ltd. (因幡電機産業株式会社)coreChannel Partner/ Reseller/ DistributorMajor authorized dealer handling Daiichi Electronics products across multiple regions including Hokkaido, Tohoku, Kanto, and Kinki areas. Maintains regional offices in Sapporo, Sendai, Morioka, Tokyo, Yokohama, Osaka, and other locations. One of the largest electrical equipment distributors in Japan.
• Suzuki Den Co., Ltd. (スズデン株式会社)coreChannel Partner/ Reseller/ DistributorAuthorized dealer with nationwide coverage including Sapporo, Koriyama, Sendai, Tokyo, Atsugi, Chiba, Osaka, and other branches. Specializes in electrical measuring instruments and control equipment.
• Nihon Denkei Co., Ltd. (日本電計株式会社)coreChannel Partner/ Reseller/ DistributorMajor electrical equipment distributor with extensive regional coverage including Kanazawa, Koriyama, Sendai, Atsugi, Ibaraki, Utsunomiya, Kawasaki, Gunma, Saitama, Chiba, Tokyo, Niigata, Nagano, Yokohama, Ota, Koyama, Tsukuba, Matsudo, and regional offices in Chubu, Kansai, and Kyushu areas.
• Fuji Electric Technica Co., Ltd. (富士電機テクニカ株式会社)coreChannel Partner/ Reseller/ DistributorAuthorized dealer with branches covering Akita, Iwate, Koriyama, Yamagata, Miyagi, Takasaki, Tama, Tokyo (3 departments), Shizuoka, Chubu (3 departments), Mishima, Osaka, Kyoto, Kobe, Shikoku, Chugoku, Matsue, Fukuyama, Matsuyama, Yamaguchi, Oita, Kagoshima, Kitakyushu, Kumamoto, Nagasaki, Miyazaki, and headquarters.
• Mitsuiwa Denki Co., Ltd. (ミツワ電機株式会社)majorChannel Partner/ Reseller/ DistributorRegional dealer with extensive coverage in Tohoku region including Aomori, Ishinomaki, Odate, Ohmagari, Koriyama, Sendai, Sennan, Hachinohe, Hirosaki, Furukawa, Honsho, and Mutsu branches.
• Takagi Connect Co., Ltd. (株式会社タカギコネクト)majorChannel Partner/ Reseller/ DistributorAuthorized dealer with branches in Kitakanto, Kanagawa, Saitama, Tokyo, Nishi-Tokyo, Nagano, Kitaishikawa, Toyama,北上、富山、Kitaishikawa regions, with offices in Utsunomiya, Yokohama, Saitama, Tokyo, Nishi-Tokyo, Nagano, Kitakanto, Kakamigahara, and Hamamatsu.
• Nishino Sangyo Co., Ltd. (西野産業株式会社)majorChannel Partner/ Reseller/ DistributorRegional dealer covering Sendai, Toyama, Tokyo, Yokohama, Nagoya, Osaka, Kyoto, Kobe, Higashi-Osaka, Okayama, Hiroshima, Fukuoka, and Kitakyushu regions.
• Fujii Sangiyo Co., Ltd. (藤井産業株式会社)majorChannel Partner/ Reseller/ DistributorAuthorized dealer with extensive branch network including Tohoku (Sendai), Ota, Koyama, Saitama, Takasaki, Chiba, Tsukuba, Hitachi, Head Office, Maebashi, Mito, Tokyo, Nagoya, and regional offices.

Scale indicators5 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Toshiba Corporation: Global power-systems incumbent offering protection relays, SCADA, and grid automation. Competes with Daiichi in T&D protection and substation measurement as part of a much broader electronics and energy portfolio.
• Fuji Electric Co., Ltd. Japanese power and industrial systems manufacturer producing power meters, protection relays, and substation equipment for utilities and industry — directly competing with Daiichi in protection/measurement and sharing dealer Fuji Electric Technica.
• Mitsubishi Electric Corporation: Diversified global power-systems and factory-automation incumbent offering protection relays, power meters, and energy-management systems. Overlaps with Daiichi in industrial and utility protection but at vastly greater scale with full digital-substation portfolios.
• ABB Ltd. Global leader in protection relays (REX640, REF615 series), instruments, and substation automation. Sets the standard that Daiichi's DMR-Pro and QT2-500 compete against in Japanese industrial and utility accounts.
• Eaton Corporation: Global power-management manufacturer offering protective relays, meters, and surge protection devices — direct overlap with Daiichi's industrial and solar protection product lines.
• Siemens AG: Global SIPROTEC protection-relay and SENTRON power-metering franchise competing with Daiichi in Japanese utility and industrial accounts, particularly for IEC 61850 digital-substation specifications.
• Schneider Electric SE: Global energy-management and automation major with the Easergy and PowerLogic protection/metering lines that compete head-to-head with Daiichi's relay and transducer portfolio in industrial plants and renewable sites.

Direct peers

• Omron Corporation: Major Japanese industrial automation and electronic components manufacturer producing protection relays, sensors, and control components that overlap Daiichi's relay/detector lineups. Omron is named in Daiichi's compatible-component partnerships and competes directly in factory-automation protection and monitoring.
• Schweitzer Engineering Laboratories (SEL): US-based specialist in numerical protection relays, fault indicators, and synchrophasors — a focused direct competitor to Daiichi's DMR-Pro and DRPR/DVRR series with comparable specialization and global install base.
• Yokogawa Electric Corporation: Japan-based test, measurement, and industrial automation specialist with broad power-metering and transducer portfolios serving utilities and industrial customers — directly comparable to Daiichi's measurement, transducer, and meter businesses.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/daiichi-electronics-co-ltd

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Daiichi