NDB Distribution transformer tester – NDB-DOC-3™

NDB Distribution transformer tester – NDB-DOC-3™

The NDB-DOC-3™ is a test instrument designed for distribution networks transformers from 5kVA to 3MVA. It can determine the presence of short circuits or open circuits in the distribution transformer primary winding & also short circuits on the secondary winding.

The NDB-DOC-3™ is designed to be operated without disconnecting the transformer’s secondary windings from their loads.


  • De-energized transformers from 5kVA to 3MVA
  • Measurement by contact on the transformer primary bushing
  • Detects primary transformer short-circuit, open circuit, & secondary short circuits
  • Visual and audible warning
  • Linestar