Enhanced insulated wires with a triple-insulated structure, for use in switching power supply transformers. They can reduce heat generation from coils and allow them to be downsized for lower profiles.
The lineup of these products includes multiple stranded wire conductor types as well as bonding types, for uses including high-frequency, high-power transformers in automotive applications and equipment such as high-capacity servers.


It is a coined word combining the acronym "Triple Indurated Wire" and "TOTOKU".


Product Map (Application According to Thermal Resistance Class and Switching Frequency)

(note) Indicated switching frequencies are rough guidelines only.

(note 1) Products in the area indicated "TIW-SB" are available as self-fusing types.

Acquired Safety Standard Certifications

Certification Authority TIW-2S TIW-2 TIW-2LZ TIW-3 TIW-3LZ TIW-E TIW-4 TIW-FE TIW-PF2
UL UL2353 (UL60950-1、UL60601-1)
CSA CAN/CSA C22.2 (No.60950-1-07、No.60065-03)
TUV EN 60950-1、EN 60065
EN 60601-1
VDE EN 60950-1
INTERTEK EN60950-1、EN60065

Self-fusing Types

Certification Authority TIW-2SB TIW-2LZSB TIW-3SB TIW-3LZSB TIW-ESB
UL UL2353 (UL60950-1、UL60601-1)
TUV EN60950-1、EN60065
VDE EN60950-1、EN60601-1、EN61558-1、EN61558-2-16、EN62368-1
INTERTEK EN60950-1、EN60065

(note) TOTOKU's electric wires are incorporated into the following systems.
Sumitomo Bakelite Co., Ltd. SBI
Hitachi Chemical Co., Ltd. HIS

(note) Please inquire with us since this information will differ by product type.

(note) The information shown reflects the status of acquired certifications at the time our catalog was prepared. Please inquire with us for details.

Product Inquiry about Triple Insulated Winding Wire