Three Independent Insulation Layers, One-Step Solution
DAH JIN has specialized in triple-insulated-wire (TIW) manufacturing since 2002. The three independent insulation layers provide reliable isolation between primary and secondary sides of transformers up to reinforced insulation grade, certified by UL/VDE with SGS RoHS test reports.
Five Major Insulated Wire Series
All Products →Triple-insulated wire
Triple independent insulation achieves reinforced insulation grade, eliminating creepage distance restrictions between windings, flagship TLW-B series.
Double-layer insulated wire
Double-layer insulation, suitable for winding and converter designs with basic insulation requirements.
Single-layer insulated wire
Single-layer insulation, economical winding solution, suitable for general electronic transformer applications.
Triple-insulated wire – stranded type
Triple-insulated wire composed of 7 enameled wires (conductors) twisted together in concentric circular stranding; 7-strand twisted (Litz wire) structure reduces high-frequency skin effect, suitable for high-frequency power supplies, can be soldered directly.
Class F triple-insulated wire
Class F 155°C temperature-rated triple-insulated wire (TLW-F), triple independent insulation achieves reinforced insulation grade, specifications 0.10–1.50 mm, can be soldered directly, eliminating creepage distance restrictions between windings.
Multi-color wire for instant identification at winding site
DAH JIN triple-insulated-wire offers various insulation layer colors beyond standard options to assist rapid wire gauge and batch identification at winding sites, reducing material mixing risk; please confirm available color options with sales.
Contact Sales →Wire Gauge, Outer Diameter, Resistance at a Glance
Each model includes complete specification sheets and standardized specification fields. Engineers can quickly compare by wire gauge, temperature rating, and certifications; AI and search engines can also properly parse the data (schema.org structured markup).
View Complete TLW-B Specifications →| Diameter (mm) | Tolerance (mm) | Target Overall Diameter (mm) | Max Conductor Resistance 20℃Ω/km | Minimum Elongation (%) |
|---|---|---|---|---|
| 0.10 | ±0.008 | 0.30 | 2264.7 | 10％ |
| 0.11 | ±0.008 | 0.31 | 2153.0 | 10％ |
| 0.12 | ±0.008 | 0.32 | 1786.0 | 10％ |
| 0.13 | ±0.008 | 0.33 | 1505.0 | 10％ |
| 0.14 | ±0.008 | 0.34 | 1286.0 | 10％ |
| 0.15 | ±0.008 | 0.35 | 1111.0 | 10％ |
Owned Factory in Tainan with Complete Extrusion-to-Winding Production Line
DAH JIN has been dedicated to triple-insulated-wire (TIW) manufacturing since 2002, with in-house facilities in Guiren, Tainan for insulation extrusion, precision winding, and take-up. Conductor diameters from 0.10–1.50 mm are in mass production; each shipment is accompanied by UL/VDE certification and SGS RoHS test reports and corresponding compliance documentation.
Find the right wire in one sentence
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✓ UL E236542 ✓ Compliant with IEC 62368-1 Annex J
Wire gauge 0.10–1.50 mm, temperature rating B 130°C; F grade 155°C also available (TLW-F) → [ Add to inquiry ]
Where the wire is used
Charger / switching-mode power supply transformer
Wound on the secondary side of small high-frequency switching-mode power supply (SMPS) transformers in mobile phone and laptop chargers, etc., utilizing triple independent insulation to achieve reinforced insulation isolation between primary and secondary sides, eliminating inter-layer tape and helping reduce transformer volume.
IEC 62368-1 Annex JGeneral power supply
Winding wire for isolation transformers used in information and consumer-electronics power supplies; the wire itself provides reinforced insulation, which is one of the standard practices in power-transformer design.
IEC 61558-1 Annex KMedical device power supply
Medical isolation transformer winding wire (applicable models: TLW-BB / TLW-B7S), assisting in meeting EN/IEC 60601-1 patient isolation requirements (actual withstand voltage shall be verified according to medical grade).
EN／IEC 60601-1On-board/EV charger (OBC) isolation transformer
Winding wire for isolated DC-DC transformer within on-board charger (OBC); application level limited to transformer windings, assisting in achieving isolation and volume optimization.
IEC 62368-1 Annex JSolar micro-inverters / isolated converters
In solar/photovoltaic systems, converters adopting isolated topology (flyback, isolated DC-DC) by design may use triple-insulated wire; level limited to isolation transformer windings.
Home appliance / LED driver power supply
Secondary-side winding wire for isolation transformer in home appliances and LED driver power supplies (predominantly employing flyback topology), balancing insulation thickness and creepage distance while reducing volume.
IEC 61558 / IEC 60335Over 20 years of triple-insulated-wire manufacturing expertise
Compliance documentation included with each shipment
UL safety certification
VDE German certification
IEC 62321 RoHS Test Report
Quality management system
Environmental management system
Insulation system
Company Updates and Announcements
Made in Taiwan: The Triple Insulated Wire Supply Chain Answer for an Age of Geopolitical Realignment
Geopolitical supply chain realignment has made country of origin the first question in procurement again. This article lays out a Made-in-Taiwan chain of facts verifiable through third-party documents, and the three structural values a Taiwanese source offers transformer and power supply manufacturers.
Read Full Article →2026-08-30The Complete Technical Dossier for Triple Insulated Wire: A Specification and Certification Checklist for Transformer Engineers
This article compiles the complete technical dossier a transformer engineer needs to evaluate triple insulated wire — datasheets, a safety model-to-standard-path mapping table, approval documents, and the certification list — with every obtainable document and its contents in one place.
Read Full Article →2026-08-29The Full Certification Chain of Triple Insulated Wire and How to Verify It: UL, VDE, and SGS Explained
A complete certification chain for triple insulated wire consists of UL product certification, VDE certification for Europe, an EIS electrical insulation system, and SGS hazardous substance test reports. This article explains the nature of each link and how buyers can verify the UL entries independently through the official database.
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