Littelfuse 460-VBM Three-Phase Voltage MonitorLittelfuse 460 VBM Voltage Monitor Product Description The Model 460 VBM is designed to protect 3 phase loads from damaging power conditions. The 460 VBMs wide operating range combined with UL and CE compliance enables quick access to domestic and global markets. A unique microcontroller based voltage and phase sensing circuit constantly monitors the 3 phase voltages to detect harmful power line conditions. When a harmful condition is detected, the