Maximum operating temperature for Schneider Electric current transformers (CT)

=SE= range of transformers have never been tested at temperatures above 60° (ambient temperature).
We have carried out the tests concerning the heating of a transformer carrying a continuous thermal current equal to the nominal primary current according to the EN 60044-1 standards (section 4.6) as you can check in type test documents.

The results of these tests mean that our transformers are in class B of insulation. That is to say a maximum temperature rise of 85° and so maximum limit in working temperature 85° + 50° = 135° where 50° is the upper limit of ambient temperature. All the components have been chosen to withstand this maximum limit.

So the maximum ambient temperature at which the transformers can work for a continuous operation complying with all the requirements is 50°.

In order to guarantee the transformers working at higher ambient temperature the materials of the components (e.g. plastic housing) need to be changed or modify the transformer dimensions.

Note: temperature in terms of °C

Attached is a specification document for the CTs from the PowerLogic System Catalogue (2009)

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Legacy KB System (APS) Data: RESL200179 V1.0, Originally authored by DaMi on 10/06/2009, Last Edited by DaMi on 10/06/2009
Related ranges: Current transformer TI