The Woodward MRU3-11D, also cataloged as the MRU3 Voltage Protection Relay, operates as a dedicated hardware component for direct voltage monitoring, overvoltage/undervoltage protection, and phase unbalance evaluation within AC distribution...

Product Description The ABB SPAU 330 C1-AA is a multi-functional voltage monitoring and protection relay designed for precise supervision of busbar phase-to-phase voltages and residual voltage ($U_0$) in medium- and high-voltage power systems. As part of...