Description
3-PHASE VOLT MONITOR
Description
The 202 series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50*/60 Hz motors
regardless of size. The 202-RP (and the 202-575-RP for 475–600 V ac) monitors the phase rotation of the three-phase
systems and trips on reverse-phase only. Critical applications include fan motors, scroll compressors, grinders, conveyor
systems, elevators, and escalators. Both products provide a user-selectable, nominal voltage setpoint and automatically
select between the 200 V and 400 V range.
This unique microcontroller-based voltage and phase-sensing device constantly monitors the three-phase voltages to
detect harmful power line conditions. When a harmful condition is detected, the MotorSaver® deactivates its output relay
after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified
amount of restart delay time (or a manual reset). The 202 series includes advanced single LED diagnostics. Five different
light patterns distinguish between faults and normal conditions. The status light turns green and the relay is activated when
rotation is correct.
Applications
• Fan motors
• Scroll compressors
• Grinders
• Conveyor systems
• Elevators and escalators
https://www.littelfuse.com/assetdocs/202-voltage-monitor-datasheet?assetguid=7b368ea9-5766-4fb4-81d6-dad1af5fb451
