Product Core Brief
- Model: ABB REM545BG226CAAA
- Brand: ABB
- Series: REL545 / REL500
- Core Function: Feeder protection and control for MV distribution systems
- Product Type: Numerical protection relay (IED)
- Key Specs: 1 A / 5 A CT input | IEC 60870-5-103 | 110–250 V AC/DC auxiliary supply
- Condition: New Original (New Surplus)
Product Introduction
ABB REM545BG226CAAA is a numerical feeder protection relay from the REL545 family, engineered for medium-voltage industrial and utility distribution systems. The relay combines feeder protection, event monitoring, alarm handling, and configurable I/O logic within a compact protection platform commonly used in switchgear retrofits and legacy ABB installations.
This unit supports IEC 60870-5-103 communication for SCADA integration and is typically deployed in substations requiring dependable overcurrent and earth-fault protection without migrating to full IEC 61850 architecture. The BG226CAAA hardware variant defines a specific I/O and auxiliary supply configuration. Verify firmware compatibility and terminal assignment before installation.
Frequently Asked Questions
Q: Can REM545BG226CAAA be hot-swapped?
A: No. De-energize CT, VT, and trip circuits before replacement. Removing the relay live can damage both CT circuits and relay outputs.
Q: Is this model obsolete?
A: The REL545 platform is considered legacy, but many substations still rely on it. ABB continues limited support for installed systems and spare components.
