Distribution transformer tester

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.




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  • 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



NDB-DOC-3 replacement test lead

Test lead for NDB-DOC-3, distribution transformer tester.

Part number: NDB-DOC3-02

Length: 1.5 meters (5 ft)

Transportation Case

Transportation box for NDB-DOC-3, distribution transformer tester.

Part number: BOX-113A

Dimensions: 11 x 21 x 30 cm (4 x 8 x 12 inches)

Transformer Elbow Adapter Pins

Transformer elbow adapter pins

Part number: DOC-3-Pin-kit

Contact us: support@ndbtech.com

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