What Sanyou Corporation does

Sanyou Corporation (三友联众集团股份有限公司) is a Dongguan, China-based manufacturer of electromechanical relay components and adjacent magnetic sensing devices, founded in 2008 and listed on the Shenzhen Stock Exchange under ticker szse:300932. Its product portfolio spans eight core categories: general-purpose power relays (5A–17A), communication relays, magnetic latching relays (5A–120A), photovoltaic relays (40A–300A), high-voltage DC relays for new energy and EV applications (10A–600A, using proprietary ceramic brazing sealing technology for arc-free, fire-proof, explosion-proof performance), automotive relays (20A–250A), industrial control relays, plus current transformers and plug-in inductors. The company claims 555 R&D patents, an in-house equipment R&D center, and recognition as one of China's Top 100 Electronic Component Enterprises.

Sanyou serves five end-markets — new energy (solar PV, energy storage, EV charging), smart home/IoT, automotive, home appliances, and power metering — with the new energy and automotive verticals positioned as strategic growth priorities supported by dedicated Shanghai Auto and Shanghai Power marketing centers. The go-to-market model combines direct enterprise field sales through regional offices (Shenzhen, Shanghai, Hangzhou, Nanjing, Chongqing, Hebei) with a layered channel of authorized regional agents, and internationally through wholly-owned subsidiaries in Canada (Richmond, BC), Germany (Kriftel), and Korea (Seoul), with representative offices in Mexico, Japan, and India. The pricing model is quote-based across all product lines, and the company currently maintains 11 subsidiaries and 3 grand-subsidiaries with 3,000+ employees.

The group generated revenue of approximately $330M in 2025 with roughly $33M in EBITDA, reflecting modest single-digit annual growth over the prior four years. Strategic posture in 2026 is decisively outbound: Sanyou broke ground in May 2026 on its first overseas self-built factory in Vietnam, signaling a transition from sales-only overseas presence to owned manufacturing capacity outside China, and continues to broaden its HV DC, PV, and automotive relay lines as electrification demand scales. Multi-jurisdictional certifications (UL, c-UL, TUV, VDE, CCC, CQC, plus IEC metering standards) reduce qualification friction when bidding on global OEM sockets, while the company remains founder-led under Chairman and General Manager Zhao Song.

Name

Sanyou Corporation

Legal name

三友联众集团股份有限公司 (Sanyou Lianzhu Group Co., Ltd.)

Website

https://sanyourelay.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Sanyou Corporation is a Dongguan-based, Shenzhen-listed Chinese manufacturer of electromechanical relays (general power, magnetic latching, PV, HV DC, automotive, industrial control) plus current transformers and inductors, serving new energy, automotive, smart home, home appliance, and smart-meter OEMs through a global direct-sales and agent network spanning 8 countries.

Ownership category

akta.pro rank

Product category

Electromechanical Relays

NAICS

Relay and Industrial Control Manufacturing (335314), Power, Distribution, and Specialty Transformer Manufacturing (335311), Electrical Equipment Manufacturing (33531)

SIC

Electrical Industrial Apparatus (3620), Electronic Coils, Transformers & Other Inductors (3677), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

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

akta.pro secondary industries

Automotive Power Electronics & Inverters/Converters Manufacturing (IMACAJAE), EV/Industrial Charging Power Electronics (Chargers, rectifiers, power stages) (IMAGADAF)

Keywords

• Electromechanical relays
• Automotive relays
• Photovoltaic relays
• Current transformers
• Plug-in inductors

Headquarters

HQ city

Dongguang

HQ country

China

HQ region

Asia

Offices10 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Relay Manufacturing and Sales: Revenue generated from manufacturing and selling comprehensive range of relays including general power relays, magnetic latching relays, new energy relays, automotive relays, and industrial control relays. Also includes current transformers and plugin inductors.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Sanyou Corporation designs, manufactures, and sells a comprehensive range of electromechanical relays (general power, communication, magnetic latching, photovoltaic, high-voltage DC, automotive, and industrial control relays), current transformers, and plug-in inductors for OEM customers in new energy, automotive, smart home, home appliance, and power metering industries. The company operates its own manufacturing facilities with proprietary ceramic brazing sealing technology for new energy relay applications and serves global markets through regional sales offices and authorized distributors.

Product overview

Sanyou Corporation (三友联众集团股份有限公司) is a professional relay manufacturer offering a comprehensive portfolio of electromechanical components. The product portfolio includes: (1) General-purpose power relays (SFK, SJ, SLA, SLC, SM, SR series) ranging 5A-16A; (2) Communication relays (SYS, DSY2Y series) with high sensitivity; (3) Magnetic latching relays (WJ31/WJ32/WJ33, SY31/SY32 series) with 5A-120A switching capacities; (4) Solar/photovoltaic relays (SMIC, SMIA, SPV series) for 40A-300A applications; (5) High-voltage DC relays (SEC, SEL, SEP, SEV, SEF, SES series) with ceramic sealed technology for new energy/EV applications; (6) Automotive relays (SARB, SARC, SARF, SARJ, SARN, SAR18, SAF7, SMAE series) for 20A-250A vehicle applications; (7) Industrial control relays (SMUA, SMUB series); (8) Current transformers and sensors (ZMCT, ZMECT, ZMDCT, ZMC series) for meter measurement, relay protection, and motor protection; (9) Plug-in inductors (SLF, SLM series). The company operates as a platform of modular product lines serving automotive, industrial, energy, and smart grid sectors.

Differentiator

Problem solved

Functional benefit

Products and services

• General Power Relays (SFK, SJ, SLA, SLC, SM, SR series) General-purpose electromechanical power relays with current ratings from 5A to 16A and high load capacity up to 16A, designed for industrial control and consumer electronics applications.
• Communication Relays (DSY2Y, SYS, SYS1, SYS1K series) Communication relays with high sensitivity (150mW-200mW coil power) designed for telecommunications equipment applications.
• Magnetic Latching Relays (WJ31, WJ32, WJ33, SY32 series) Magnetic latching relays with contact switching capacities from 5A to 120A, featuring low power consumption, pulse drive operation, and strong shock resistance; IEC62052-31 UC2 compliant on WJ33F and IEC62055-31 UC3 compliant on WJ33D.
• Photovoltaic Relays (SMIC, SMIA, SPV series) Photovoltaic relays for solar energy systems with contact capacity from 40A to 300A and coil holding voltage reduction for energy savings; UL, TUV, and CQC certified.
• High-Voltage DC Relays (SEC, SEL, SEP, SEF, SES, SEV series) High-voltage DC relays for new energy applications including electric vehicles, with ceramic brazing sealed technology enabling arc-free operation and ratings from 10A to 600A.
• Automotive Relays (SARB, SARC, SARD, SARF, SARJ, SARI, SARP, SARQ, SARS, SAR18, SAR20, SMAE, SAF7 series) Automotive relays with contact switching capacities from 20A to 250A, designed for vehicle electrical systems including starter controls, lighting, HVAC, and electronic control modules.
• Industrial Control Relays (SMUA, SMUB series) Industrial control relays for automation systems with multiple pole configurations (1P to 4P).
• Current Transformers (ZMCT, ZMECT, ZMDCT, ZMC series) Current transformers and sensors (互感器) for smart electricity meters and power distribution systems, including anti-DC meters, single-phase and three-phase meters, zero-sequence CTs, split-core CTs, relay protection transformers (CT/PT), motor protection transformers, and digital display meters.
• Plug-in Inductors (SLF common mode, SLM differential mode series) Plug-in inductors including common mode inductors (SLF series) and differential mode inductors (SLM series) for power filtering applications.

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered minor.

• 青县择明 (Zeming, Qingxian)minorOthersSubsidiary/affiliated company under Sanyou Group providing specialized relay products. Website: zmlxdz.com
• 三友电力科技 (Sanyou Power Technology)minorOthersSubsidiary/affiliated company focused on power technology solutions. Website: china-wanjia.com

Scale indicators5 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• Hongfa Technology: Hongfa Technology is China's largest relay manufacturer and the most direct competitor to Sanyou. Both companies compete head-to-head in general purpose, automotive, and new energy (HV DC/PV) relays for global OEM customers, with overlapping product portfolios and a similar go-to-market through Chinese manufacturing scale.
• Fujitsu Component Limited: Fujitsu Component is a specialized electromechanical components manufacturer with a strong relay portfolio (signal, power, automotive, solar). Directly comparable to Sanyou as a relay-focused vendor competing for the same automotive and renewable energy OEM design-ins.
• Standex-Meder Electronics: Standex-Meder is a relay and magnetics specialist serving automotive, industrial, and renewable energy markets. Comparable to Sanyou as a relay-focused player with strong presence in HV DC and signal relays for similar end customers.
• Song Chuan Group: Song Chuan is a Taiwanese-headquartered relay manufacturer serving automotive, home appliance, and industrial customers globally. Directly comparable to Sanyou in product portfolio and target markets, with similar scale and a global sales network.

Broad incumbents

• Omron Corporation: Omron is one of the world's largest electromechanical component manufacturers, with a deep relay portfolio spanning general purpose, automotive, and industrial control. Comparable to Sanyou in core relay category but vastly larger, with stronger brand pull and broader automation/control offerings.
• TE Connectivity: TE Connectivity is a global leader in connectors and relays, serving automotive, industrial, and energy customers. Overlaps with Sanyou in automotive and HV DC relay sockets and is a benchmark for global channel reach, automotive OEM qualifications, and product breadth.
• Panasonic Industry: Panasonic manufactures a broad range of relays including automotive, signal, and power relays for global OEMs. Comparable to Sanyou across multiple relay categories and serves similar home appliance, automotive, and industrial customers, but at materially greater scale.
• Schneider Electric: Schneider Electric is a global electrical equipment, power distribution, and industrial automation incumbent. Relevant as a broad incumbent whose products intersect with Sanyou's relays and current transformers in industrial control, smart grid, and energy management end markets.
• Siemens AG: Siemens is a diversified industrial and electrical equipment giant with relays, switchgear, and automation products overlapping Sanyou's industrial control and power metering categories. Comparable as a broad incumbent setting the standards Sanyou's products must meet.
• Eaton Corporation: Eaton is a global power management company with electrical components, relays, and industrial control products. Comparable to Sanyou in serving automotive, industrial, and energy customers, though at significantly larger scale and broader portfolio.

Market position

Strengths1 record

Weaknesses1 record

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/dongguan-sanyou-electrical-appliances-co.-ltd.

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries15 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 Sanyou Corporation