Thermal protection relay AQ-M257

three-phasefor electric motorsIEC

The AQ-M257 offers a modular motor protection and control solution for larger and more important motors requiring differential protection. Up to 9 optional I/O or communication cards are available for extensive monitoring and control applications. Up to 16 RTD signals can be connected for thermal alarming and tripping. The AQ-M257 communicates using various protocols including IEC 61850 substation communication standard. Highlights Differential protection Large I/O capability 5 time constant accurate thermal model Softstart protection starting from 6Hz Stardelta started motor supervision 2 speed motor protection Up to class 0.2S power and energy measurement