Main products
Triple-insulated wire – stranded type
ULVDESGS · RoHSB grade 130°CDirect solderableUL 2353
Triple-insulated wire (TLW-B7S) composed of 7 enameled wires (conductors) twisted together in concentric circular stranding; belongs to triple-insulated wire series, can be soldered directly, approved by UL E236542/VDE 40008834, suitable for high-frequency power supplies reducing skin effect.
Specification Sheet
Litz Triple Insulated Wire (TLW-B7S)
Litz Triple Insulated Wire (TLW-B7S)
| Dimensions | Max Conductor Resistance | Package Length | ||
|---|---|---|---|---|
| Conductor Diameter | Insulation | |||
| Target Overall Diameter | Max Target Overall Diameter | |||
| (mm) | (mm) | (mm) | (Ω/km) | (m) |
| 7/0.10 | 0.522 | 0.562 | 346.9 | 5000 |
| 7/0.11 | 0.552 | 0.592 | 285.2 | 4000 |
| 7/0.12 | 0.588 | 0.628 | 238.4 | 4000 |
| 7/0.13 | 0.618 | 0.658 | 202.4 | 3000 |
| 7/0.14 | 0.648 | 0.688 | 173.8 | 3000 |
| 7/0.15 | 0.678 | 0.718 | 151.1 | 3000 |
| 7/0.16 | 0.714 | 0.754 | 132.4 | 2000 |
| 7/0.17 | 0.744 | 0.784 | 117.0 | 2000 |
| 7/0.18 | 0.774 | 0.814 | 104.2 | 2000 |
| 7/0.19 | 0.804 | 0.844 | 93.34 | 2000 |
| 7/0.20 | 0.834 | 0.874 | 84.10 | 2000 |
| 7/0.21 | 0.864 | 0.904 | 76.18 | 1500 |
| 7/0.22 | 0.894 | 0.934 | 69.96 | 1500 |
| 7/0.23 | 0.930 | 0.970 | 63.91 | 1500 |
| 7/0.24 | 0.960 | 1.000 | 58.61 | 1500 |
| 7/0.25 | 0.990 | 1.030 | 53.94 | 1500 |
| 7/0.26 | 1.020 | 1.060 | 49.81 | 1000 |
| 7/0.27 | 1.050 | 1.090 | 46.13 | 1000 |
| 7/0.28 | 1.080 | 1.120 | 42.85 | 1000 |
| 7/0.29 | 1.110 | 1.150 | 39.91 | 1000 |
| 7/0.30 | 1.146 | 1.186 | 37.01 | 1000 |
Product CharacteristicsThermal classClass B (130°C) Dielectric Breakdown Voltage> 12,000 V Direct SolderabilityDirect tinning solderable, no stripping required Pinholes0 Safety Registration NumberUL E236542 Reference SpecificationsCNS8938 · C3151 · UL2353 · UL1950 Country of OriginTaiwan (R.O.C.)
TLW-B Specification Characteristics (per approval document UL E236542)
High-voltage resistant, direct-solderable, triple-layer independent insulation. The following are characteristics per the approval document; complete wire gauge specifications are shown in the specification table below.
Structure Description
Conductor + Triple Independent Insulation = Reinforced Insulation
Triple-insulated wire extrudes three independent insulation layers sequentially over the copper conductor, each capable of independently passing insulation testing. When stacked in three layers, it qualifies as a winding wire component at the "Reinforced Insulation" level as defined in annexes such as IEC 62368-1 Annex J and IEC 61558-1 Annex K (actual status per corresponding certification documents), thereby allowing elimination of isolation tape and reduction of creepage distance during winding, resulting in smaller transformers and more streamlined winding processes.
Copper Conductor
Copper wire providing the primary conductive path.
First Insulation Layer (PET)
Polyester PET, basic insulation directly covering the conductor.
Second Insulation Layer (PET)
Second independent PET insulation, enhancing voltage withstand capability.
Third Insulation Layer (PA)
Outermost polyamide PA; three independent layers stacked achieve reinforced insulation level.
Application areas
Application Areas
Charger / switching-mode power supply transformerGeneral power supplyMedical device power supplyOn-board/EV charger (OBC) isolation transformerSolar micro-inverters / isolated convertersHome appliance / LED driver power supply
Certification StandardsCompliance and Certifications
ULValid
UL safety certificationSGSValid
IEC 62321 RoHSOTHERValid
Other CertificationsISOValid
Quality management systemVDEValid
VDE German certification
UL safety certificationSGSValid
IEC 62321 RoHSOTHERValid
Other CertificationsISOValid
Quality management systemVDEValid
VDE German certification
Applicable Standard: UL 2353; achieves IEC 62368-1 Annex J / IEC 61558-1 Annex K reinforced insulation level
Go to Technical Certificate Page →Related Products
Other Insulation Wire Series
Triple-insulated wire TLW-B
DAH JIN flagship triple-insulated wire (models TLW-B/TLW-BB). Triple independent insulation achieves reinforced insulation grade, eliminating creepage distance restrictions between windings; high-voltage resistant, can be soldered directly (no need to strip outer layer first). Approved by UL E236542, VDE 40008834, temperature rating Class B 130°C, conductor wire diameter 0.10–1.50 mm.
Multiple Wire Gauge SpecificationsUL / VDE
View Spec Sheet →Double-layer insulated wire
Double-layer independent insulation winding wire (TLW-B2), belonging to the same approval series as flagship TLW-B; approved by UL E236542, can be soldered directly.
Multiple Wire Gauge SpecificationsUL
View Spec Sheet →Single-layer insulated wire
Single-layer insulated economical winding wire (TLW-B1), suitable for general electronic transformer applications. Approved by UL E236542.
Multiple Wire Gauge SpecificationsUL
View Spec Sheet →Class F triple-insulated wire
Class F triple-insulated wire (TLW-F): temperature rating Class F 155°C, specifications 0.10–1.50 mm, triple independent insulation achieves reinforced insulation grade, can be soldered directly, eliminating creepage distance restrictions between windings. Same approval series as TLW-B.
Multiple Wire Gauge SpecificationsUL / VDE
View Spec Sheet →FAQ
Frequently Asked Questions
Can Triple-insulated wire – stranded type be used in reinforced insulation designs per IEC 62368-1 Annex J?
Triple-insulated wire features three independent insulation layers extruded sequentially over the copper conductor, each capable of passing insulation tests independently. When combined, the three layers qualify as reinforced insulation per IEC 62368-1 Annex J, IEC 61558-1 Annex K, and similar annexes (subject to the corresponding certification document), enabling winding without isolation tape and reduced creepage distance, resulting in smaller transformers and streamlined winding processes.
How do I check the conductor structure, thermal rating, and gauge specifications of Triple-insulated wire – stranded type?
Triple-insulated wire – stranded type (model TLW-B7S) features a 7-strand stranded copper conductor (7 enameled wires concentrically stranded) conductor with three independent insulation layers, rated at Class B (130°C). The specification table on this page expresses conductor diameter as "strand count / single-strand diameter" (first row sample: 7/0.10), with single-strand diameter range of 0.10–0.30 mm, totaling 21 specifications. The stranded structure reduces skin effect in high-frequency applications.
What is the dielectric breakdown voltage of Triple-insulated wire – stranded type?
Per the acceptance certificate (UL E236542), Triple-insulated wire – stranded type has a dielectric breakdown voltage of > 12,000 V, with pinhole rating 0. This value matches the source in the "Product Characteristics" card on this page; actual test conditions and determination are subject to DAH JIN acceptance certificate and shipment report.
Can Triple-insulated wire – stranded type be soldered directly? Do I need to strip the insulation first?
Yes. The solderability listed under "Product Features" on this page is: Direct tinning solderable, no stripping required, allowing the winding process to omit the stripping step. Please confirm the actual soldering temperature and dwell time through trial production based on your process conditions, and refer to the recommended conditions in DAH JIN's specification sheet as the standard.
How do I verify the UL and VDE certification status of Triple-insulated wire – stranded type?
Triple-insulated wire – stranded type is covered by UL filing number UL E236542 (per UL 2353) and VDE certificate number 40008834; all models in the same series use a single approval document with no separate certificate numbers per model. You may query by file number on UL Product iQ; our "Technical Certificates" page provides the official UL verification link. The VDE certificate and its appendix documents are provided by our sales contact together with your quotation request. RoHS test reports per IEC 62321 are also available upon request. Reference specification: CNS8938 · C3151 · UL2353 · UL1950.
How do I request samples and quotations for Triple-insulated wire – stranded type?
Please provide the model, conductor diameter, estimated annual consumption, and application conditions (e.g., transformer specifications and safety requirements) via the online inquiry form. Our sales team will respond with the corresponding specification sheet and sample arrangement. The minimum order quantity (MOQ) is 1,000 m, with a lead time of approximately 2–8 weeks (depending on current shipment volume); packaging methods and lead times for non-standard diameters will be confirmed separately based on diameter and quantity—please contact your sales representative.
Start collaboration
Triple-insulated wire – stranded type — Need a quote or samples?
Tell us your requirements—product model, specifications, and quantity—and our sales team will provide a complete quote or samples.
Online Inquiry / Request Sample →