250A

250A is a three-phase, auto-ranging, dual-range voltage monitor that protects motors regardless of their size. This monitor offers protection from low- and high-voltage, voltage unbalance, single-phase, and phase reversal. 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. Typical applications include fan motors, air conditioners, compressors, heat, well and sump pumps, small conveyer motors.

• Proprietary microcontroller-based circuitry
• Monitoring of single-phase, low-voltage, voltage unbalance, harmful power line conditions
• Auto-sensing wide voltage range, automatically senses system voltage, saves setup time
• Advanced LED diagnostics, quick visual indicator for cause of trip
• Adjustable trip delay, prevents nuisance tripping due to rapidly fluctuating power line conditions
• DPDT relay output, allows for versatility to meet wide application needs
• Manual reset, allows for inspection of equipment before system is re-energized
• 190–480V AC line voltage, -40°C to 70°C temperature range
• Provides high and low voltage protection at fixed percentage of nominal voltage
• Comply with UL 508 (File #E68520), CSA 22.2 No. 14 (File#46510)