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Precision Transformer Accessories
Engineered to Perform

Zhuzhou Zhaoxu Technology Co., Ltd. (Sun-Mold) has been a trusted manufacturer of custom bobbins, bases, clamps, terminals, and heat sink accessories since 2007. Delivering high-quality magnetic components for power electronics worldwide.

About Sun-Mold

Zhuzhou Zhaoxu Technology Co., Ltd., operating as Sun-Mold, has been a leading manufacturer of precision transformer accessories since 2007. We specialize in custom-designed bobbins, bases, clamps, terminals, and heat sink components for the global electronics and power supply industries.

With facilities in Zhuzhou, Hunan Province and Dongguan, Guangdong Province, we combine advanced tooling, strict quality control, and responsive customer service to deliver reliable components that meet exacting international standards.

17+
Years Experience
50+
Global Clients
Manufacturing Workshop Tool and Mold Making Quality Inspection Test Equipment

Our Product Range

We offer a comprehensive selection of standard and custom transformer accessories, including bobbins, bases, clamps, terminals, and heat sink components.

EFD Bobbin

EFD Bobbin

High-precision bobbin for EFD core types, ideal for compact power supplies and LED drivers.

PQ Base

PQ Base

Robust base for PQ cores, designed for high-power applications with excellent thermal stability.

RM Clamp

RM Clamp

Secure metal clamp for RM core assemblies, ensuring mechanical integrity and EMI shielding.

EI Terminal

EI Terminal

Durable terminal block for EI transformers, supporting high current and reliable connections.

ETD Bobbin

ETD Bobbin

Efficient bobbin for ETD core shapes, optimized for low-profile and high-efficiency designs.

SMD Bobbin

SMD Bobbin

Surface-mount compatible bobbin for automated assembly in modern electronics.

UU Clamp

UU Clamp

Heavy-duty clamp for UU core transformers, providing structural support and vibration resistance.

EP Base

EP Base

Precision-molded base for EP core transformers, ensuring alignment and insulation.

ERL Clamp

ER/ERL Clamp

Specialized clamp for ER and ERL core types, offering secure fastening and thermal management.

Heat Sink Accessory

Heat Sink Accessory

Thermal management components including ED, EQ, and EC series accessories.

POT Core Base

POT Core Base

Shielded base for pot core transformers, minimizing EMI and enhancing performance.

Custom Bobbin

Custom Solutions

Fully customizable bobbins, bases, and clamps tailored to your exact specifications.

Why Choose Sun-Mold?

We combine precision engineering, rigorous quality control, and customer-focused service to deliver reliable components.

Advanced Tooling

In-house mold and tool making ensures precision, consistency, and fast turnaround for custom designs.

Strict Quality Control

Comprehensive inspection and testing procedures including dimensional checks and material verification.

Global Reach

Serving clients across North America, Europe, and Asia with reliable logistics and responsive support.

17+
Years in Business
50+
Global Clients
2
Manufacturing Sites
100%
Custom Solutions

Frequently Asked Questions

What materials do you use for bobbins and bases?

We use high-temperature thermoplastics such as PBT, PA66, and PET, meeting UL94V-0 flammability standards. Material selection is based on thermal, mechanical, and electrical requirements.

Can you produce custom designs?

Yes, we specialize in custom transformer accessories. Provide your specifications, drawings, or samples, and we’ll develop a solution tailored to your needs with fast prototyping.

What core types do you support?

We manufacture components for EFD, PQ, RM, EI, ETD, EPC, EP, ER, ERL, UT, UU, and other standard and custom core shapes.

What is your production lead time?

Standard products: 7–10 days. Custom designs: 15–25 days depending on complexity and tooling requirements. We offer expedited options upon request.

Do you provide samples?

Yes, we offer free samples for qualified customers. Contact us with your requirements and shipping details.

Get in Touch

Reach out to discuss your custom transformer accessory needs. We’re ready to support your next project.

Contact Person

Andy

Mobile

+86 13538435115

Email

andy.sunmold@gmail.com

Locations

Zhuzhou & Dongguan, China

Visit Official Website

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