Editing Bobbin (section)

== Electrical ==
In [[electricity|electrical]] applications, [[transformer]]s, [[inductor]]s, [[solenoid]]s, and [[relay]] coils use bobbins as permanent containers for the wire to retain shape and rigidity, and to ease assembly of the windings into or onto the [[magnetic core]].<ref>{{cite web|url=https://www.gotrend.com.tw/ec99/rwd1606/news.asp?newsno=136  |title= What is Bobbin?|author= <!--Not stated-->|date=16 March 2024|website=GoTrend |publisher=|access-date=2024-09-09|quote=}}</ref> (Such [[Electromagnetic coil|coil]]s of wire carrying [[Electric current|current]] create the [[induced current]]s and  [[magnetism|magnetic field]]s required in these devices.)<ref>{{cite web|url=http://www.iec-international.com/bobbins/bobbinarticle.html#:~:text=At%20the%20heart%20of%20a,a%20termination%20and%20connection%20method.  |title= Transformer Bobbin and Core Selection Involves Interdisciplinary Design and Cost Issues|author= Joe Casmero and Rich Barden|date=|website=International Electrotechnical Company |publisher=|access-date=2024-09-09|quote=}}</ref> 

Bobbins in these applications may be made of [[thermoplastic]] or [[Thermosetting plastic|thermosetting]] materials (for example, [[Phenols|phenolic]]s);<ref>{{cite web|url=https://www.lodestonepacific.com/bobbin-and-hardware-application-notes/ |title= Bobbin and Hardware: Application Notes |author= Joe Casmero and Rich Barden|date=|website=Lodestone Pacific |publisher=|access-date=2024-09-09|quote=}}</ref> this plastic often has to have a [[TÜV]], [[Underwriters Laboratories|UL]], or other regulatory agency flammability rating for safety reasons.<ref>{{cite web|url=https://www.cosmocorp.com/docs/en/COSMO-Bmaterials-en-hires.pdf |title= Coil Bobbin Materials |author= <!--Not stated-->|date=|website=Cosmo Company |publisher=|access-date=2024-09-09|quote=}}</ref><ref>{{cite web|url=https://www.magnet-tech.com/core/bobbin/ee.htm |title= Bobbin EE|author= <!--Not stated-->|date=|website=Magnet Tech |publisher=|access-date=2024-09-09|quote=}}</ref>