Standard Current Transformers

EPRO Gallspach GmbH's Standard current transformers are used in the industry since decades. They are internationally well known for maximum reliability and accuracy.


As the devices are purely inductive. Properly handled, the lifetime is up to 30 years and more without any accuracy drift or any changes. International calibration and metrological institutes as PTB Germany, INMETRO Brazil, VMI Vietnam among many others are using these devices as national standard.


In the private sector these devices are used in the labs of various manufacturers of instrument transformers, transformers and others.

The Standard current transformers are available in dry insulated or oil insulated execution with insulation levels up to 100 (200)kV. The rated current is spread from 10A in the smallest model up to 50.000A in the dry insulated models.


The oil insulated models normally offer rated current values of 1.000A to 3.000A. The guaranteed range is, depending on customer's requirements up to 1-200% of rated current, this means in this range the accuracy of the device is guaranteed. A big variety of the standard current transformers are also available in mobile execution for testing on site and transport in a truck. This mobile (outdoor) execution can be distinguished from the other devices by the light grey silicone rips on the outside.


Please see an overview of the available models here at the product data sheets. Please always consider that the mentioned datasheets are examples. Any customer's request considering tappings on the primary side, different current on the secondary, operation frequencies of 50 and 60 Hz and other wishes can be fulfilled.