Product Description

ABB RET521 1MRK001530-AC RELAY

The RET 521 includes setting adaptation to power transformer rating and instrument transformer ratios to allow protection settings in percent (%), of the power transformer rat- ing, thus facilitating the protection settings to an optimum. The RET 521 is supplied for 2-winding appli- cations and 3-winding applications as indi- cated below in Fig. 1.