Voltage Transformers - Toroidal


The standard range of toroidal transformers has been designed to enable an engineer to choose an "off the shelf" product for prototype work with the confidence that bulk production quality will be maintained.

The range has been carefully selected from voltages and ratings widely used in todays modern electronics world.  However, if the range does not meet your requirements our design team will be pleased to produce special types against your specifications.

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Manufactured according to:

UL & CSA are available upon request

Harbuch Transformers meet modern day requirements for a smaller size, low magnetic interference field transformer.  The main isolation consists of a triple layer of 50 micron class b (130degC) melinex tape which maintains a dielectric to greater than 4KV.

The secondary windings provide insulation up to 500V AC. The output voltage tolerance is +/- 5%, conforming to BS3535 and CEE15. All voltages are quoted at FULL LOAD. Add the appropriate regulation figure to obtain the off load voltage . At full VA rating the maximum temprature rise is less than 65 degrees above ambient, allowing a maxium ambient of 40 degrees. This allows the transformer to operate up to 105 degrees (class A), which is the maximum for PVC sleeving.

Standard primaries are single 240V 50Hz. Standard secondaries are two identical windings which may be connected in series or parallel, thus doubling the output voltage or current respectively.

Standard termination consists of 200mm of PVC sleeved winding wire with 10mm stripped bare copper.

For mains fusing it is recommended that a delay or anti-surge fuse be used, especially for transformers with ratings in excess of 300VA. The mounting kit supplied allows easy mounting to a chassis by placing a neoprene washer below and above the transformer and bolting the dished washer down firmly on the top.

To minimise the risk of damage to the windings, the bolt should not be over-tightened and both ends of the bolt must not be allowed to simultaneously come into contact with the metal chassis as this would act as a shorted turn.

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