50 / 60 (50 will increase all delay timers by 20%)
Output Form
DPDT - 2 Form C
Output Load Rating (VA)
Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac
Restart Delay Range
Manual; 2 - 300 s adjustable
Trip Delay Range
Under/Over Voltage: 4 s; Unbalance/Phase faults: 2 s
Trip Point Accuracy (%)
±1%
Undervoltage Trip Voltage
0.85
Undervoltage Reset Voltage (%)
0.88
Voltage Unbalance Trip Point (%)
0.06
Voltage Unbalance Reset (%)
0.045
Termination Type
Torque: 7 in-lbs; Wire Size: 12 - 18 AWG
Mounting Method
#8 screws
Operating Temperature
-40° to 70°C (-40° to 158°F)
Humidity
Up to 95% non-condensing per IEC 68-2-3
Dimensions
2.93 H x 5.27 W x 2.95 D in. (94.4 x 133.9 x 74.9 mm)
Series Features
250A Series - 3-Phase Voltage/Phase Monitor
Series Description: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.
Series Applications:Fan motors, Air conditioners, Compressors, Heat, well, and sump pumps, Small conveyer motors
Proprietary microcontroller-based circuitry: Constant monitoring of single-phase, low-voltage, voltage unbalance, phase reversal, harmful power line conditions
Auto-sensing wide voltage range: Automatically senses system voltage between 190–480 V ac. 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
