Certification

Our enterprise is certified in accordance with the file number E248952 by UL in the categories OBJY2 and OBJY8.
That’s why we are able to produce transformers after electrical insulation systems of the thermal class rating B (130 °C),
F (155 °C) and N (200 °C). The UL standard 508 requires the usage of an after UL 1446 licensed electrical insulation system, if the device temperature exceeds 85 °C.

A transformer contains different isolation materials. To assure, that these materials maintain their function under operation conditions, all materials of one isolation system are being combined exposed to environmental conditions and are that way given a thorough check. As opposed to the individual test we are able to predict the interaction of the materials under operating conditions.

An insulation system involves all insulation materials,
e.g. coil formers, ground insulation, winding and interwinding insulation, wire insulation, tapes, insulation sleeving, insulation resins, potting compound and boxes. Our insulation system UL2-200 stands out due to its high temperature class
N (200 °C).The insulation system UL3-130 is accredited for the temperature class B (130 °C) and is characterised by the possibilty of the vacuum casting in a box. In the insulation system UL4-155 that belongs to the temperature class
F (155 °C), triple insulated wires (inter alia) can be applied, so that a safe electric disconnection is given solely through the winding wire without any additional insulation.

For further questions according our UL-insulation systems,
please don’t hesitate to contact us. Call us or write an email.

 
 

ul zertifikat witema

 

 

ul zertifikat witema

 

 

ul zertifikat witema