Product Core Brief
- Model: RET620 NBTNAAAAABC1BNN11G
- Brand: ABB
- Series: Relion 620
- Core Function: Protects two- or three-winding power transformers.
- Type: Transformer Protection IED
- Key Specs: Stabilized differential protection, IEC 61850, configurable I/O
Condition: New Original (New Surplus) — not refurbished. Verify full ordering code match for your application.
Product Introduction
Substation upgrades require relays that fit existing panels without surprises. The ABB RET620 NBTNAAAAABC1BNN11G handles protection, control, measurement, and supervision for two- or three-winding power transformers and generator-transformer blocks in utility and industrial systems.
In field deployments of 620 series units, this configuration delivers stable differential protection with harmonic restraint. It supports thermal overload and backup functions effectively. Honestly, the withdrawable design reduces downtime during swaps. Bottom line — it works when CT ratios and vector groups match your transformer nameplate.
