China · Yongfan Electric Co., Ltd. (YOF®) — ISO9001 & CCC Certified OEM/ODM Manufacturer

China Direct Manufacturer of Industrial Transformers, Soft Starters & Voltage Stabilizers

Headquartered in Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang, China, China · Yongfan Electric Co., Ltd. (YOF®) is a specialized industrial automation control manufacturer integrating R&D, modern production, and global B2B wholesale supply across 5 major product series and 300+ models.

Explore 5 Production Lines (300+ Models)

Dongfeng Industrial Zone, Liushi Town, Yueqing, Zhejiang

CHINA · YONGFAN ELECTRIC CO., LTD. (YOF® Manufacturing Base)

Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China

2009

Year Founded in Yueqing, China
5 Series

Core Industrial Product Lines
300+

Standard & Custom Models
ISO & CCC

Certified Quality System

Dedicated to Industrial Automation Control R&D, Manufacturing & Global Supply Since 2009

Who We Are: China · Yongfan Electric Co., Ltd. (YOF®)

Founded in 2009, China · Yongfan Electric Co., Ltd. (YOF®) is a specialized electrical manufacturer dedicated to the independent research and development, production, and global distribution of industrial automation control products. Since our inception, we have consistently upheld a customer-demand-oriented philosophy, anchored by high technology and driven by continuous technical innovation—supplying global industrial buyers, switchgear builders, and wholesale distributors with reliable quality, competitive factory-direct pricing, and responsive service.

Today, YOF® manufactures 5 major product series encompassing more than 300 models and specifications: our Transformer Series, Intelligent Soft Starter Series, Auto-Transformer Reduced-Voltage Starting Series, AC Voltage Stabilizer Series, and Contact Voltage Regulator Series. Relevant product series have passed ISO9001 International Quality Management System Certification and China Compulsory Product Certification (CCC).

By implementing an advanced quality management system, enforcing strict scientific production administration, and continuously investing substantial capital to introduce modern manufacturing and testing equipment, YOF® provides a solid guarantee for consistent product quality, refined manufacturing craftsmanship, and rapid bulk order dispatch.

YOF® CORPORATE PHILOSOPHY & COMMITMENT

“Integrity First, Quality Foremost — Win-Win Cooperation, Pioneering Innovation”

Core Principle

Integrity as the foundation, Quality as the first priority in every coil, core, and cabinet.
B2B Operating Goal

Win-win long-term partnership with global electrical wholesalers, OEMs, and project contractors.

Verified Factory Fact Sheet (From Official YOF® Catalog)

Registered Name
CHINA · YONGFAN ELECTRIC CO., LTD.

Trademark Brand
YOF® (Registered Industrial Electrical Brand)

Year Established
2009

Factory Address
Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang, China

Quality & Standards
ISO9001, CCC, IEC60947-2-2:2002, GB14048.6-2008, GB14048.4-2003

Four Fundamental Pillars Guaranteeing Quality, Craftsmanship & Fast Delivery

Skilled staff, advanced engineering technology, modern production equipment, and strict scientific management are the root foundations that enable YOF® Electric to grow continuously and earn long-term buyer trust.

Skilled Technical Workforce

Experienced electrical engineers and trained assembly technicians specialize in precision coil winding, silicon-steel core lamination, SCR power drive integration, and full-load cabinet wiring.
Advanced R&D Technology

Independent microprocessor control R&D featuring fuzzy PID closed-loop torque algorithms, non-contact thyristor compensation, and low-loss dry-type magnetic circuit design.
Modern Production Equipment

Continuous capital investment in automated coil winding machines, vacuum impregnation systems, and dielectric & thermal aging test benches ensures consistent batch quality.
Strict ISO9001 Management

End-to-end ISO9001 quality management and CCC compliance protocols govern incoming raw material inspection, in-process testing, and 100% pre-shipment load verification.

Certified to ISO9001 & CCC with Strict IEC / GB Engineering Testing

Every transformer, soft starter, starting box, stabilizer, and voltage regulator undergoes rigorous factory inspection before leaving our Yueqing production base.

ISO9001 & China Compulsory Certification (CCC)

YOF® operates under an ISO9001 International Quality Management System, and relevant products hold China Compulsory Product Certification (CCC)—ensuring full traceability from copper/silicon-steel material sourcing to final assembly.

✓ Verified in Official YOF® Factory Catalog
IEC60947-2-2, IEC68-2 & GB14048 Compliance

Our intelligent soft starters and starting cabinets are engineered in strict conformity with IEC60947-2-2:2002, GB14048.6-2008, GB14048.4-2003, and JB/T8752-1998, plus IEC68-2-27 (15g, 11ms shock) and IEC68-2-3 (93% non-condensing humidity).

✓ Harsh Industrial Environment Validated
Dielectric Withstand, Overload & Thermal Protection Tests

Voltage stabilizers undergo 1500V/1min (TNS) to 2000V/1min (SBW) dielectric withstand testing without flashover, insulation resistance verification (≥2MΩ to ≥5MΩ), and 12-function motor protection calibration.

✓ 100% Pre-Shipment Inspection Protocol

Frequently Asked Questions For Overseas Buyers

Sourcing Directly from YOF® Electric Factory

1. Are you a direct manufacturer or a trading company? −

China · Yongfan Electric Co., Ltd. (YOF®) is a 100% direct industrial manufacturer established in 2009 in Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China. All 5 major series and 300+ models—including transformers, soft starters, starting boxes, voltage stabilizers, and contact voltage regulators—are engineered, assembled, and tested in our own facility.

2. Can you customize input/output voltages for different national power grids? +

Yes. As stated in our technical specifications for the BK, JBK3/JBK5, JMB/BJZ/DG, and SBK/SG(ZSG) transformer series, primary and secondary voltages can be customized beyond standard 220V/380V ratings to match your local grid or machinery requirements. Our Intelligent Soft Starters also support optional 220V and 660V three-phase power configurations alongside standard 380V±15% (50/60Hz).

3. How do I choose between Online and Bypass Intelligent Soft Starters for my wholesale clients? +

Both series cover 5.5kW to 630kW and conform to GB14048.6-2008 / IEC60947-2-2:2002:

• Online Intelligent Soft Starter & Cabinet: Uses a full-time 3-in 3-out thyristor structure requiring no external bypass AC contactor, reducing secondary wiring costs and thriving in dusty, smoky, or sandy environments.

• Bypass Type Intelligent Soft Starter & Cabinet: Switches to a bypass AC contactor after startup for minimal thermal dissipation during continuous run, equipped with 12 motor protections and a delayed bypass switch parameter to prevent contactor burn.

4. What information should I provide to get a fast wholesale or OEM quotation? +

Please specify: (1) Model Series & Rated Capacity (e.g., BK-5000VA, SBK-100kVA, SBW-300kVA, TDGC2J-10kVA, or Online Soft Starter 115kW), (2) Input & Output Voltage / Phase / Frequency (50Hz/60Hz), (3) Enclosure Type (Open vs. Protective / Movable vs. Cubicle), and (4) Order Quantity. Our engineering sales team will reply promptly with factory pricing, packing dimensions, and lead times.

CHINA · YONGFAN ELECTRIC CO., LTD. (YOF®)

Professional China manufacturer of BK/JBK/JMB/SBK/SG Transformers, Online & Bypass Intelligent Soft Starters & Cabinets, YFX01 Autotransformer Starting Boxes, TND/TNS/SBW/DJW/SJW Voltage Stabilizers, and TDGC2/TSGC2 Contact Voltage Regulators since 2009.

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FACTORY CONTACT

Add: Dongfeng Industrial Zone, Liushi Town, Yueqing City, Zhejiang Province, China

Tel: +86-577-27877036 | Fax: +86-577-27877037

Mobile: +86-13968736791 / +86-13868325933

Email: YOF@cnyofan.com

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8613968736791

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