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Exiting self-leads for termination are twisted over themselves isone, times to strengthen wire and prevent breakage. Other grades used include H50, etc. Means connecting an internal winding wire, either to a PCB bobbin pin or to another more flexible lead that can safely exit the transformer. SHUNTS Lamination material arranged with appropriate insulation to vary and control the magnetic circuit of the transformer.

Each material give the core distinctly different magnetic properties. Sizes normally available are 0. Grain Oriented isonrl which is typically 0. The actual insulation properties of this paper are not high.

Usually is the first winding, but may be split in two or in rare cases be the final winding. This allows for a JUMBLE type winding that is always contained and insulated from the laminations by the bobbin walls. To bring the leads up along the side of the bobbin, or up ON TOP through the slots, to be terminated on top islnel the winding with external leads and using woven sleeving.


A walled former with a central hole sized to fit a specific lamination type and stack. Thicknesses normally available range from 0.

Core made up of magnetic materials composed of oxides containing ferric ions as their main constituent. Tongue is one dimension of the interior rectangle, stack total thickness is isonrl other.

Means tubular PVC or woven fibre placed around the winding wire for additional protection and insulation. Absorbent thin brown paper used normally to stabilise and separate the layers in small high isonrl transformers.

There can also be electrical advantages to encapsulating. Can also get Grade III.

Varnishes & Solvents

Similar properties to steel laminations but having a magnetic circuit that is more suitable for higher frequencies. Composite moulded construction of compressed ferrite granules. A magnetic core consisting of a circular ring of iron powder, ferrite, steel or other material. Means filling the specified bobbin side-slots usually high SIDE-SLOTS voltage or primary side with a thickened opaque mixture of epoxy resin after final assembly and varnishing.

Page 25 – Catalogue

Winding wire having TWO layers of protective enamel coating higher electrical insulation. Thickness of each is 0. Once heated to this temperature, the fuse becomes useless and the transformer must be replaced or rewound. Usually used to describe layer winding — but can be Useful for bobbin winding to isonfl winding isnel. Any variations of this will be specified.


A layer of copper shim, generally the full-width of the bobbin, or a specified widthwound as ONE complete turn and insulated from the windings either side. To seal a transformer in a coffin using 462 or other resin. On winding sheets this will also include core type or any reference to the type of magnetic circuit. Standard 6642 of a lamination eg. Layer winding as opposed to jumble winding is done by using a manufactured former and winding successive layers in such a way that: Used in situations where high temperatures would prevent use of normal insulations.

TAP An intermediate point in a winding brought out for termination. Refers to mylar sheet insulation inserted between the bobbin and laminations,to provide increased insulation, where: Electrical grade Insulating paper.

A container into which a transformer is inserted for sealing and mounting in a resin.

Used as insulation mostly between windings and as an outer wrap.