Protection Relays and Controls Catalog
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250600
3-PHASE VOLTAGE MONITOR/ 475-6 | Series: 250AThe 250A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size from low and high voltage, unbalance/single-phase, and reverse-phase. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The 250A also features adjustable or manual restart delay.
This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the Littelfuse output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 250A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.
| Property | Value |
|---|---|
Input Voltage (V) | 500 - 600 Vac |
Output Form | DPDT - 2 Form C |
Termination Type | Torque: 7 in-lbs; Wire Size: 12 - 18AWG solid or stranded |
Dimensions | 2.93 H x 5.27 W x 2.95 D in. (94.4 x 133.9 x 74.9 mm) |
Weight (kg) | 0 Kg (kilogram) |
Humidity | Up to 95% non-condensing per IEC 68-2-3 |
Input AC Line Frequency (Hz) | 50 / 60 (50 will increase all delay timers by 20%) |
Maximum Input Power (W) | 5 |
Output Load Rating (VA) | Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 Vac |
Overvoltage Reset Voltage (%) | 107% |
Overvoltage Trip Voltage (%) | 110% |
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 Reset Voltage (%) | 93% |
Undervoltage Trip Voltage (%) | 90% |
Voltage Unbalance Reset (%) | 4.50% |
Voltage Unbalance Trip Point (%) | 6% |
Mounting Method | #8 screws |
Operating Temperature Max (°C) | 70 |
Operating Temperature Maximum Fahrenheit | 158 |
Operating Temperature Minimum Celsius | -40 |
Operating Temperature Minimum Fahrenheit | -40 |
Storage Temperature Maximum Celsius | 80 |
Storage Temperature Maximum Fahrenheit | 176 |
Storage Temperature Minimum Celsius | -40 |
Storage Temperature Minimum Fahrenheit | -40 |
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| Part Number | Part Description | RoHS | Pb-Free | RoHS (2015/863/EU) Certificate | REACH (SVHC's) Declaration | REACH (SVHC's) | Halogen Free | IPC-Material Declaration | |
|---|---|---|---|---|---|---|---|---|---|
| 250600 | 3-PHASE VOLTAGE MONITOR/ 475-6 | View More |
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