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The 250A series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50*/60 Hz motors regardless of their size. This monitor offers protection from low- and high-voltage, voltage unbalance, single-phase, and phase reversal. The 250A provides a user-selectable nominal voltage setpoint and will automatically select between the 200 V and 400 V range. This monitor also features adjustable or manual restart delay.
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 output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The 250A monitor includes advanced, single LED diagnostics. Five different light patterns distinguish between faults and normal conditions. LED indications include normal operation, power-up restart delay, reverse-phase trip, unbalance/single-phase trip, and high/low voltage trip.
*Note: 50 Hz will increase all delay timers by 20 %.
- Proprietary microcontroller-based circuitry
- Auto-sensing wide voltage range
- Advanced LED diagnostics
- Adjustable trip delay
- DPDT relay output
- Manual reset
- Constant monitoring of single-phase, low-voltage, voltage unbalance, phase reversal, harmful power line conditions
- Automatically senses system voltage between 190–480 V ac. Saves setup time
- Quick visual indicator for cause of trip
- Prevents nuisance tripping due to rapidly fluctuating power line conditions
- Allows for versatility to meet wide application needs
- Allows for inspection of equipment before system is re-energized
250A Parts
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Filters
250A Applications
- Fan motors
- Air conditioners
- Compressors
- Heat, well, and sump pumps
- Small conveyer motors
