What is the NEC H3040D?
The NEC H3040D is a DC-DC power converter, listed by the manufacturer as "DC-DC CONV". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The NEC H3040D is a DC-DC power converter — originally specified as "DC-DC CONV" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The NEC H3040D is a DC-DC power converter, listed by the manufacturer as "DC-DC CONV". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished NEC network equipment, including parts such as the H3040D, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue