Distribution transformer tester

The NDB-DOC-3™ tester helps lineman crews to determine if it’s safe to re-energize a distribution transformer after a fault.




  • 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)

Contact us

Contact us by email

Business days

Monday to Friday, 8:00 to 17:00 

Eastern Time Canada

ndb Technologies

1405-111 ave. St-Jean-Baptiste

Quebec city, Qc

G2E 5K2, Canada

Contact us

1 (418) 877 7701

1 (418) 877 7787