Littelfuse 3 Phase Universal Voltage & Frequency Monitor w/ Display (190-480V)

The Model 601 is a fully-programmable voltage monitor designed to protect 3-phase motors. It can be used as a stand-alone product or networked with an RM-1000, RM-2000, PLC, computer or SCADA system. When a harmful condition is detected, the 601’s output relay is deactivated after the specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for the programmed restart delay (RD2). Eleven (11) setpoints are viewable with the 3-digit LED display or from a networked device: low voltage high voltage voltage unbalance low frequency high frequency RS485 address trip delay for voltage/frequency faults trip delay for single-phase faults rapid-cycle timer (RD1) restart delay after all faults (RD2) type of restart after all faults (manual or automatic) Six (6) parameters are viewable while the motor is running: L1-L2 voltage L2-L3 voltage L1-L3 voltage average voltage voltage unbalance (%) voltage frequency (%)