EN IEC 61558
Safety of transformers, power supplies and combinations. The baseline reference for isolation and safety transformers.
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Every part leaves powered up and measured
A wrong winding does not show. It shows the day the machine is already at the customer. That is why electrical testing is not a line item: it is the last step before packing, on every part.
The tests we run
| Test | What it verifies | How many parts |
|---|---|---|
| Dielectric strength | Insulation withstand between primary, secondaries and core | 100 per cent |
| Insulation resistance | Insulation quality under direct voltage | 100 per cent |
| Turns ratio | Correct open circuit voltage on each secondary | 100 per cent |
| No load current | No shorted turns and correctly sized core | 100 per cent |
| Ohmic resistance | Continuity and wire gauge on each winding | 100 per cent |
| Thermal test under load | Temperature rise within the declared class | Production sample |
| Dimensional check | Finished envelope and lead positions | Production sample |
Normative references
We build to customer specification. When the specification calls up a standard, the part is designed and tested accordingly and the test report says so.
Low Voltage Directive
Directive 2014 35 EU. A transformer is a component: CE marking stays with the maker of the finished appliance, we supply the data they need.
RoHS and REACH
Regulation 2011 65 EU and Regulation 1907 2006. Wire, insulation, resins and tapes are bought with a supplier declaration of conformity.
Thermal classes
Class B at 130 degrees, class F at 155 degrees, class H at 180 degrees. The class is chosen during design together with the permitted temperature rise.
Materials
- Tape wound toroidal cores in grain oriented electrical steel
- Ferrite, iron powder, sendust and nanocrystalline cores for inductors
- Enamelled copper wire from 0.08 mm to 3.00 mm, thermal class per design
- Polyester and nomex insulating tapes between layers
- Low emission impregnating resins
- Silicone flying leads, tinned faston tabs, terminal blocks
Documentation we can supply
- Part data sheet with values measured on the sample
- Electrical test report per batch
- Declaration of the materials used
- Dimensioned drawing of the finished part
- Batch traceability kept for at least five years
You need a signed test report
Tell us which standard your specification calls up and what has to appear in the report. We prepare it together with the first batch.