ABB (Hitachi ABB) Transformer Serial Number Lookup & Decoder Guide - Power Transformer Technical Guide & Educational Resources

Written by Tan, Electrical Engineer @ Transformer4U | Last Updated: January 2026 | Reading Time: ~5 minutes

This guide explains how to decode ABB (Hitachi ABB) transformer serial numbers to determine
manufacturing date, year, and equipment specifications.

⚡ Quick Answer: ABB Serial Number Format

Format: Check Nameplate or Contact ABB

Year Position: Characters Varies

Example: See Nameplate → Check
nameplate for date field

1. ABB Serial Number Format

ABB (Hitachi ABB) uses the following serial number format for transformers:

Varies by Product

Pattern: Check Nameplate or Contact ABB

Element	Position	Meaning
Year Code	Position Varies	Manufacturing year (2 digits or letter code)
Month/Week Code	Position Varies	Manufacturing month or week
Sequential Number	Remaining digits	Unique unit identifier

Notes: Power transformers usually have manufacturing date printed directly on nameplate. Contact
ABB for serial number decoding

2. How to Decode Your ABB Serial Number

📋 Step-by-Step Decoding

Locate the Nameplate
- Padmount: Inside cabinet door
- Substation: Tank exterior near control cabinet
- Dry-type: Enclosure frame
Find the Serial Number – Look for “S/N”, “Serial No.”, or “Serial Number” field
Identify Year Code – Characters at position Varies
Decode Manufacturing Date – Use the format table above
Contact ABB if Needed – https://new.abb.com/

📐 Decoding Example

Serial Number: See Nameplate

Manufacturing Date: Check nameplate for date field

3. Source Reliability

Source Type: ⚠️ Varies by Product Line

ABB power transformers typically have the manufacturing date printed directly on the
nameplate as a separate field (e.g., “Mfg Date: 2023-01”). Serial number formats vary by product line and
manufacturing plant. For accurate decoding, contact ABB customer support with your complete serial number.

4. Why Serial Numbers Matter

Use Case	Why Serial Number is Critical
Warranty Claims	ABB needs serial number to verify purchase date and coverage
Replacement Parts	Serial number links to specific winding configuration and tap settings
Age Assessment	Determines remaining life expectancy (transformer life: 25-40 years)
PCB Testing	Pre-1979 transformers may contain PCBs requiring special handling (EPA regulations)

5. Frequently Asked Questions

❓ How do I decode a ABB transformer serial number?

Locate the serial number on the nameplate, then use the format guide on this page to identify the manufacturing
date. The year is typically at position Varies. If the format doesn’t match, contact ABB directly.

❓ Where is the serial number on a ABB transformer?

The serial number is located on the nameplate—typically a metal or durable plastic plate
affixed to the transformer. On padmount units, it’s inside the cabinet door. On dry-type units, check the
enclosure frame.

❓ Can ABB provide manufacturing date from serial number?

Yes, ABB maintains production records for decades. Contact their customer support at https://new.abb.com/ with the complete serial
number to obtain the exact manufacturing date and specifications.

6. Related Resources

🔍 Complete Serial Number Guide
All manufacturers + decoding methods

📋 Transformer Nameplate Guide
How to read every nameplate detail

📏 Transformer Sizing Chart
Complete kVA selection guide

📝 About This Guide

This ABB serial number decoding guide is authored by Tan, Electrical Engineer at Transformer4U.

Serial number formats may vary by product line or manufacturing era. For authoritative
decoding, contact ABB directly at https://new.abb.com/.

Disclaimer: Serial number formats may vary by product
line, manufacturing plant, and era. This guide provides general decoding information. For authoritative
manufacturing dates, contact ABB directly.