
Series: 777 ACCUPOWER
Littelfuse 777 AccuPower Relay Provides Exceptional Protection








The 777 AccuPower is a fully-programmable, 3-phase motor and pump protection relay. It allows for entry of motor hp rating, full-load amperes, efficiency, and power factors, and will then accurately calculate motor output power. The 777 AccuPower relay is most useful with mag-drive pumps or process applications where the process power is desired over the utility power. Voltage, current, and power measurements can be displayed as well as fault information and setpoints. The built-in display simplifies troubleshooting and allows the user to easily and precisely configure setpoints.
The 777 AccuPower can be used with the optional COM 4-20 output communication module to give an analog signal proportional to output shaft power. Other optional accessories include the RS485MS-2W comms module; the RM1000 remote monitor; and the RM2000 remote monitor. See the accessories products for complete information.
- Built-in display
- Motor output power measurement
- Network communications capability
- 3 programmable restart delay timers
- Remote display compatibility
- Visual indication for programming, viewing real-time voltage or current, and last fault code
- Allows use of process power over utility power
- Limited Modbus capabilities using RS485MS-2W communications module
- Allows separate restart delay time for rapid cycle protection, motor cool down, and dry-well recovery
- Increases safety through remote display of real-time data and fault history. Aids with arc-flash safety regulations
777 ACCUPOWER Parts
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Part Number | Actions | Input Voltage (V) | Output Form | Termination Type | Mount Method | Full Load Amp Range (A) | Dimensions | Weight (kg) | Overcurrent Trip Class | Overcurrent Trip Point | Address | Current Accuracy (%) | Current Unbalance Trip Delay (s) | Current Unbalance Trip Point (%) | Ground Fault Accuracy (%) | HP/kW Accuracy (%) | Humidity | Input AC Line Frequency (Hz) | Maximum Input Power (W) | Output Load Rating (VA) | Pollution Degree | Protection Class | Rapid Cycle Timer (s) | Repeat Accuracy (%) | Restart Delay Range | Sensor Hole Size | Short Circuit (kA) | Storage temperature (°C) | Surge Protection | Timing Accuracy (%) | Voltage Accuracy (%) |
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Part Number | Actions | Input Voltage (V) | Output Form | Termination Type | Mount Method | Full Load Amp Range (A) | Dimensions | Weight (kg) | Overcurrent Trip Class | Overcurrent Trip Point | Address | Current Accuracy (%) | Current Unbalance Trip Delay (s) | Current Unbalance Trip Point (%) | Ground Fault Accuracy (%) | HP/kW Accuracy (%) | Humidity | Input AC Line Frequency (Hz) | Maximum Input Power (W) | Output Load Rating (VA) | Pollution Degree | Protection Class | Rapid Cycle Timer (s) | Repeat Accuracy (%) | Restart Delay Range | Sensor Hole Size | Short Circuit (kA) | Storage temperature (°C) | Surge Protection | Timing Accuracy (%) | Voltage Accuracy (%) | |
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190 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 25: 3 phase (looped conductors required); 25 - 90: 3 phase (direct); 80 - 800: 3 phase (external CTs) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 5; J5; 10; J10; 15; J15; 20; J20; 30; J30 | (20 - 100 A) … MULT of 80 - 140% of CT primary | A01 - A99 or OP1 | ±3% (<100 A direct) | % over setpoint / Trip time: 1% / 30s; 2% / 15s; 3% / 10s; 4% / 7.5s; 5% / 6s; 6% / 5s; 10% / 3s; 15% / 2s | 2 - 25% or 999 (disabled) | ±15% | ±3% | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 3 | IP20 (finger safe) | 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | 2 - 500 m or A (Automatic) | Max conductor size: 0.65 in (with insulation) | 100 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | 5% ±1 s | ±1% |
777 ACCUPOWER Applications
- For use with mag-drive pumps or process applications where the process power is desired over the utility power