Transformer Protection Terminal ABB RET521 1MRK001530-AE

Description

TheABB RET521is a numerical transformer protection relay designed to deliver advanced protection and control for power transformers in utility substations and industrial power systems. It consolidates multiple standalone relays by integrating differential protection, overcurrent protection, voltage supervision, and breaker control into a single device.This model supportsmulti-breaker arrangementsanddoes not require interposing CTs, simplifying system design and reducing installation complexity.