NEC 9712-305-491B Power Supply +12VDC 3.0A +12VDC 0.05A -12VDC 0.2A Ault Inc

NEC 9712-305-491B Power Supply +12VDC 3.0A +12VDC 0.05A -12VDC 0.2A Ault Inc

The NEC 9712-305-491B is a multi-rail DC power supply manufactured by Ault Inc. for NEC America, Inc. It provides three separate DC output rails — two positive 12V rails at different current ratings and one negative 12V rail — delivered through a hardwired multi-conductor output cable terminated with ring terminals and bare wire ends. The unit is designed for indoor commercial use and connects via a standard 3-prong AC receptacle.

Specifications & What's Included

• Model / Part Number: 9712-305-491B
• Manufactured by: Ault Inc. for NEC America, Inc.
• Output Rail 1: +12VDC @ 3.0A
• Output Rail 2: +12VDC @ 0.05A
• Output Rail 3: -12VDC @ 0.2A
• Number of Output Rails: 3
• Output Connection: Hardwired multi-conductor cable with ring terminals and bare wire ends
• Input: AC via 3-prong receptacle (indoor/commercial use)
• Form Factor: External rectangular brick-style enclosure
• Includes: Unit with attached hardwired output cable

Applications

This type of multi-rail external power supply is typically used to power proprietary NEC telephony, PBX, or communications equipment that requires multiple DC voltage rails from a single external supply. Ault Inc. was a well-known OEM power supply manufacturer that produced custom-specified units for major telecom and computing OEMs including NEC. The hardwired ring-terminal output cable suggests this unit was designed to wire directly into a chassis or terminal block rather than connect via a standard plug — common in telecom cabinet and PBX infrastructure equipment of the 1990s. This unit is suited for maintaining or repairing NEC systems that originally used the 9712-305-491B, or as a replacement in any application requiring the same output rails.