Description
AT&T 631DA1 Power Unit Series 3 PBX 120V 5.2A 300W +5V 60A Telecom
This is a power supply module designed for AT&T PBX office telephone systems. It converts AC input to regulated DC output with battery backup capability for continuous operation during power loss.
Specifications & What's Included
- Model: AT&T 631DA1 Series 3
- AC Input: 120V, 5.2A, 60Hz
- DC Output: +5V at 60A (300W rated)
- Battery Backup: 150V DC input, 2.5Ah lead-acid
- Alarm Relay: K700 contacts, 30V DC, 100mA Class 2
- Cooling: Fan cooling required (250 ft/min)
- Max Ambient Temperature: 50°C
- Power unit only; no accessories included
Applications
This unit supplies regulated +5V DC power to AT&T PBX telephone switching systems and associated office telecom equipment. It was commonly used in commercial telephone installations from the 1980s–2000s. The battery backup ensures the system maintains operation during AC power interruptions, critical for business continuity in telephony environments.
Condition: Used
This AT&T 631DA1 Series 3 PBX Power Unit has been inspected and appears to be in good used condition. It was pulled from a working office telecom environment. The chassis shows some light surface discoloration typical of age — the gold-tinted side panel visible in the photos has an iridescent sheen consistent with heat exposure over time, but there is no visible physical damage. The face plate label and rating plate are intact and legible. The card edge connector pins appear clean and undamaged. Please view our photo set and contact us if you have any questions.
This AT&T 631DA1 Series 3 PBX Power Unit has been inspected and appears to be in good used condition. It was pulled from a working office telecom environment. The chassis shows some light surface discoloration typical of age — the gold-tinted side panel visible in the photos has an iridescent sheen consistent with heat exposure over time, but there is no visible physical damage. The face plate label and rating plate are intact and legible. The card edge connector pins appear clean and undamaged. Please view our photo set and contact us if you have any questions.
Warranty Information
We stand behind every item we sell with a 30-day money-back guarantee. If your item arrives not as described, you may return it within 30 days for a full refund. Please inspect your purchase upon arrival and contact us with any questions.
View AllClose
Additional Information
Brand: |
AT&T |
Model: |
631DA1 |
MPN: |
631DA1 |
Type: |
PBX Telecom Power Unit |
Series: |
Series 3 |
SKU: |
12113 |
AC Input Voltage: |
120V AC, 5.2A, 60Hz |
DC Input (Battery): |
150V DC, 2.7A; 2.5Ah Lead Acid Battery |
DC Output Voltage: |
+5V DC at 60A |
Rated Output Power: |
300 Watts |
Rectifier Type: |
Component Type Custom Rectifier |
Alarm Relay: |
K700 Contacts, Pins 014 and 113, 30V DC, 100mA Class 2 |
Cooling Requirement: |
Fan cooling required — 250 ft/min at rated output |
Max Ambient Temperature: |
50°C |
Compatible With: |
AT&T PBX Office Telephone Systems |
Form Factor: |
Module / Card Cage |
Condition: |
Used – Pulled from Working Environment |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Power unit only; no accessories included. |
Condition Notes: |
AT&T 631DA1 Series 3 PBX Power Unit. Inspected and in good used condition. Pulled from a working office telecom environment. Light surface wear consistent with age. No visible damage. Please view photos and contact us with questions. |
