![background-waves](https://www.littelfuse.com/background_waves_image.png)
Series: 777
Littelfuse 777 Current & Voltage Monitor Provides Exceptional Motor Protection![777-family](https://cdn2.webdamdb.com/1280_Ei91CkhqK3n46cdU.jpg?1732370338)
![777-575-lr-p2-front](https://cdn2.webdamdb.com/1280_2HuVZfVQ7cW31kd4.jpg?1732363717)
![777-lr-p2-front](https://cdn2.webdamdb.com/1280_MgkeEOyjWg9520xT.jpg?1732363713)
![777-lr-ts-so-Front](https://cdn2.webdamdb.com/1280_kYZXejd4Nya45IaY.jpg?1732363696)
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![777-575-hrg-p2-front](https://cdn2.webdamdb.com/1280_YcjvZ7xQ8sO21gwn.jpg?1732363680)
![777-hvr-p2-front](https://cdn2.webdamdb.com/1280_srS7N6PS1yN81Ycd.jpg?1732363661)
![777-hvr-lr-p2-front](https://cdn2.webdamdb.com/1280_gEqg4q6G8cB25wBX.jpg?1732363656)
![777-575-p2-front](https://cdn2.webdamdb.com/1280_2pBFxaXRL8x81QkO.jpg?1732363654)
![777-hvr-kw-hp-p2-front](https://cdn2.webdamdb.com/1280_MYA5TNf33j018gzr.jpg?1732363650)
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![777-hvr-kw-hp-p2-so-front-wire](https://cdn2.webdamdb.com/1280_wkNOQwkkKVr78Eph.jpg?1732363735)
![777-hrg-p2-so-back](https://cdn2.webdamdb.com/1280_kJJA4ulAic921IMe.jpg?1732363735)
![777-lr-p2-bottom](https://cdn2.webdamdb.com/1280_EzUZLKwsPFe94o7l.jpg?1732363734)
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![777-ft-top](https://cdn2.webdamdb.com/1280_gHdNwZACnF216vAx.jpg?1732363727)
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![777-575-lr-p2-ar](https://cdn2.webdamdb.com/1280_6UbuyvPCtMo02so9.jpg?1732363720)
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![777-ft-bottom](https://cdn2.webdamdb.com/1280_Y7EcnEILYM8252KE.jpg?1732363713)
![777-hrg-p2-bottom](https://cdn2.webdamdb.com/1280_QldhXZyBoKl91oS1.jpg?1732363712)
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![777-ts-top](https://cdn2.webdamdb.com/1280_gYycP5357J946n4Q.jpg?1732363709)
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![777-575-hrg-p2-so-back](https://cdn2.webdamdb.com/1280_2fkueygTTlv31I4Z.jpg?1732363703)
![777-lr-ts-al](https://cdn2.webdamdb.com/1280_Ymkwb1sjtm12cYRM.jpg?1732363702)
![777-lr-p2-top](https://cdn2.webdamdb.com/1280_AMoHL2j7eUf02wEB.jpg?1732363701)
![777-hvr-p2-bottom](https://cdn2.webdamdb.com/1280_cKU6DJh74CQ31E4F.jpg?1732363699)
![777-575-lr-p2-side2](https://cdn2.webdamdb.com/1280_5COxQKshG71wXM75.jpg?1732363699)
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![777-lr-ts-ar](https://cdn2.webdamdb.com/1280_cEuSJQSmKsJ91wvH.jpg?1732363696)
![777-lr-ts-bottom](https://cdn2.webdamdb.com/1280_kNJwrrRgkd87s9NB.jpg?1732363696)
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![777-ft-ar](https://cdn2.webdamdb.com/1280_Yrtd9o1Q387866yM.jpg?1732363694)
![777-575-lr-p2-so-front](https://cdn2.webdamdb.com/1280_cCG16Lw6go738IJR.jpg?1732363694)
![777-hvr-kw-hp-p2-side2-wire](https://cdn2.webdamdb.com/1280_ECMTJ0h6UTS33shV.jpg?1732363692)
![777-lr-ts-side2](https://cdn2.webdamdb.com/1280_Yhm7At54j088126m.jpg?1732363692)
![777-lr-ts-front](https://cdn2.webdamdb.com/1280_UWoxmzDxAv029QzK.jpg?1732363691)
![777-ts-so-back](https://cdn2.webdamdb.com/1280_MOey9BXxkw81O8rr.jpg?1732363690)
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![777-hrg-p2-so-front](https://cdn2.webdamdb.com/1280_g93FCAo6k1s57gM7.jpg?1732363688)
![777-hvr-lr-p2-side1](https://cdn2.webdamdb.com/1280_Mh6ppTBQhVe312v8.jpg?1732363687)
![777-hrg-p2-top](https://cdn2.webdamdb.com/1280_wchefkOOR12sdUiW.jpg?1732363687)
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![777-hvr-kw-hp-p2-side1](https://cdn2.webdamdb.com/1280_gbJTUOA6ObR54F4C.jpg?1732363682)
![777-ft-side1](https://cdn2.webdamdb.com/1280_qzDuYnMW9d35Mm3D.jpg?1732363681)
![777-lr-p2-so-front](https://cdn2.webdamdb.com/1280_Q1gqfco3ZiZ04gNy.jpg?1732363681)
![777-hrg-p2-ar](https://cdn2.webdamdb.com/1280_EnoKdICe3k386S3o.jpg?1732363680)
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![777-hvr-lr-p2-so-front](https://cdn2.webdamdb.com/1280_E2gyrt4DO31wjQCS.jpg?1732363678)
![777-ts-bottom](https://cdn2.webdamdb.com/1280_6EOw87N5Qs12kucn.jpg?1732363678)
![777-ts-so-front](https://cdn2.webdamdb.com/1280_MdQx7zE1qL25U0Lq.jpg?1732363677)
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![777-lr-p2-so-front-wire](https://cdn2.webdamdb.com/1280_kMuHnFQUDAO61koy.jpg?1732363666)
![777-ts-side1](https://cdn2.webdamdb.com/1280_IRX3fK8UqOE74kGc.jpg?1732363665)
![777-hvr-p2-side1](https://cdn2.webdamdb.com/1280_gNm9wY9mDdf61EMG.jpg?1732363665)
![777-lr-ts-top](https://cdn2.webdamdb.com/1280_kJsXADIf17t022hw.jpg?1732363663)
![777-hrg-p2-side2-wire](https://cdn2.webdamdb.com/1280_6qon1xdK6BH02IB1.jpg?1732363660)
![777-hvr-p2-so-back](https://cdn2.webdamdb.com/1280_6loFowoepQL81QMs.jpg?1732363659)
![777-lr-p2-side2](https://cdn2.webdamdb.com/1280_spAdy3Im8EB09sou.jpg?1732363658)
![777-hvr-lr-p2-al](https://cdn2.webdamdb.com/1280_gTWjWaDGK43IrqYj.jpg?1732363655)
![777-ft-al](https://cdn2.webdamdb.com/1280_UWHLISxPURX81ETr.jpg?1732363654)
![777-hvr-p2-so-front-wire](https://cdn2.webdamdb.com/1280_kYkm2uHrxHX17EO9.jpg?1732363654)
![777-hvr-lr-p2-so-front-wire](https://cdn2.webdamdb.com/1280_waaSXWx8vjT512xO.jpg?1732363654)
![777-hvr-kw-hp-p2-bottom](https://cdn2.webdamdb.com/1280_EekRs8WVI5f61WKe.jpg?1732363651)
![777-ft-so-front](https://cdn2.webdamdb.com/1280_6rjBDnDLLnD81Auc.jpg?1732363650)
![777-575-p2-top](https://cdn2.webdamdb.com/1280_Ar73wlYn1u786kzC.jpg?1732363646)
![777-hvr-p2-so-front](https://cdn2.webdamdb.com/1280_oI8h6zVncY212uW9.jpg?1732363643)
![777-ts-side2](https://cdn2.webdamdb.com/1280_EUyJJc7m531gF0A0.jpg?1732363643)
![777-hvr-kw-hp-p2-ar](https://cdn2.webdamdb.com/1280_Y7XoMmdMAd978MVW.jpg?1732363642)
![777-575-hrg-p2-ar](https://cdn2.webdamdb.com/1280_2D3bYY3nUKr562by.jpg?1732363642)
![777-575-lr-p2-al](https://cdn2.webdamdb.com/1280_A7P3oQJFj28416dK.jpg?1732363638)
![777-575-lr-p2-top](https://cdn2.webdamdb.com/1280_EEUlN1IMZ8o89k9X.jpg?1732363638)
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![777-575-lr-p2-so-front-wire](https://cdn2.webdamdb.com/1280_6A7CgxZCkyE21k8d.jpg?1732363626)
![777-hvr-kw-hp-p2-so-front](https://cdn2.webdamdb.com/1280_sDNgV6JRgO49A3Cu.jpg?1732363625)
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The 777 unit is a fully-programmable, electronic overload relay designed to protect any motor drawing 2-800 full load A (external CTs are required above 90 A). The 777 (family of products) is used for 3-phase, 200-480 V ac applications, with several specialized units for other voltage ranges and unique applications. Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. Some unique applications include use with a Subtrol* equipped Franklin submersible motor to detect high motor temperatures and applications where a fast linear trip is required.
All of the overload relays provide unsurpassed protection by combining overload, voltage, phase loss and reversal, voltage and current unbalance, power monitoring, and underload based on current - all in one package. For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time operational information, and displaying diagnostic codes to aid in troubleshooting a fault condition. The units also feature a communications network port that can be used with communication modules listed in the 777 accessories section to form a Modbus, DeviceNet*, Profibus, or Ethernet network. Up to 99 units can be remotely monitored and controlled from a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions software. This capability allows for a simple, cost-effective way to meet new requirements for arc-flash safety.
*Subtrol and DeviceNet are trademarks of their respective owners.
- Built-in display
- Programmable voltage and current settings
- 3 selectable restart options
- 3 programmable restart delay timers
- Remote display compatibility
- Flexible reset
- Network communications capability
- Visual indication for programming, viewing real-time voltage or current, and last fault code
- Allows usage on wide range of systems
- Choose from automatic, semi-automatic, or manual to best meet individual application needs
- Program separate restart delay time for rapid cycle protection, motor cool down, and dry-well recovery
- Aids compliance with arc flash safety regulations and increases safety by displaying real-time data remotely, which eliminates need to open a cabinet
- Reset can be done through a push button on the relay or remotely with optional 777-MRSW or OL-Reset remote reset kit
- Compatible with Modbus, DeviceNet*, Profibus, or Ethernet using optional communications module
777 Parts
Filters
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 (%) | Ground Fault Current Trip Point (A) | Ground Fault Trip Delay (s) | Humidity | Input AC Line Frequency (Hz) | Maximum Input Power (W) | Motor Acceleration Time Operating Point (s) | Number of Conductors or CT Ratio | Output Load Rating (VA) | Overvoltage Trip Voltage (%) | 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 (%) | Trip Delay Type | Undercurrent Trip Delay (s) | Undercurrent Trip Point | Undervoltage Trip Voltage (%) | Voltage Accuracy (%) | Voltage Unbalance Trip Point (%) |
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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 (%) | Ground Fault Current Trip Point (A) | Ground Fault Trip Delay (s) | Humidity | Input AC Line Frequency (Hz) | Maximum Input Power (W) | Motor Acceleration Time Operating Point (s) | Number of Conductors or CT Ratio | Output Load Rating (VA) | Overvoltage Trip Voltage (%) | 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 (%) | Trip Delay Type | Undercurrent Trip Delay (s) | Undercurrent Trip Point | Undervoltage Trip Voltage (%) | Voltage Accuracy (%) | Voltage Unbalance Trip Point (%) | |
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500 - 600 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 20 (looped conductors required); 20 - 90 direct | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | 2 - 100A with proper looping | COM: C00 - C07; RS-485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (1 - 10) … MULT or OFF | 0s (default) | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 451 - 660 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 0 - 500 s; Undercurrent: 0 - 500 s A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; A (Automatic) | 100 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | ±0.5 s | 2 - 999 s (standard) | 0; 1 - 98 A with proper looping | 450 - 649 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
500 - 600 Vac | SPDT - Form C | Torque: 7 in-lbs | 1 - 9 (direct); 10 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (2 - 100 A) … MULT of 80 - 140% of CT primary | COM: C00 - C07; RS-485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (0.3 - 2.0) … MULT or 60% of primary CT or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 2; 25; 50; 75; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 172 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (standard) | 0; 1.0 - 9.8 A … MULT or 40 - 140% of CT primary | 170 - 524 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
500 - 600 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 20 (looped conductors required); 20 - 90 (direct); 90 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (20 - 100 A) … MULT of 80 - 140% of CT primary | A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (3 - 20) … MULT or 12 - 40% of primary CT or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 451 - 660 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (standard) | 0; 10 - 98 A … MULT or 40 - 140% of CT primary | 450 - 649 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
200 - 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; J100 (J100 = Linear) | (20 - 100 A) … MULT of 80 - 120% of CT primary | A01 - A99 | ±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 - 20) … MULT or 10 - 30% of primary CT or OFF | % of setpoint / Trip time: 101 - 200% / 8s ± 1s; 30s; 201 - 300% / 4s ± 1s; 301 - 400% / 3s ± 1s; 401%+ / 2s ± 1s | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | (0 to 500) x 0.158s = (0 to 79s) | 1 - 10; or 100 - 800 ratio | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | LV setting - 528 V | 3 | IP20 (finger safe) | 0; 2 - 500 s (x0.5 if TC = J100) | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults: 2 - 500 m (x0.5 if TC = J00); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; A (Automatic) | Max conductor size: 0.65 in (with insulation) | 10 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | 5% ±1 s | Overcurrent: (2 - 500) x 0.158 s = (0.32 - 79 s) | 2 - 60 s | 0; 10 - 98 A … MULT or 40 - 100% of CT primary | 170 V - HV setting | ±1% | 2 - 15% or 999 | |||||
200 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 20 (looped conductors required); 20 - 90 direct | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | 2 - 100A with proper looping | COM: C00 - C07; RS485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (1 - 10) … MULT or OFF | 0s (default) | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 172 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (standard) | 0; 10 - 98 A with proper looping | 170 - 524 V | ±1% | 2 - 25% or 999 (disabled) | ||||||||
340 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 1 - 9 (direct); 10 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (2 - 10 A) … MULT of 80 - 140% of CT primary | COM: C00 - C07; RS485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (0.3 - 2.0) … MULT or 6 - 40% of CT primary or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 2; 25; 50; 75; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 470 VA @ 600 Vac B600; General Purpose: 10 A @ 240 Vac | 341 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (standard) | 0; 0.1 - 9.8 A … MULT or 40 - 100% of CT primary | 340 - 523 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
340 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 20 (looped conductors required); 20 - 90 (direct); 90 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (20 - 100 A) … MULT of 80 - 140% of CT primary | COM: C00 - C07; RS485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (3 - 20) … MULT or 12 - 40% of CT primary or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 470 VA @ 600 Vac B600; General Purpose: 10 A @ 240 Vac | 341 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (standard) | 0; 10 - 98 A … MULT or 40 - 140% of CT primary | 340 - 523 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
200 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 1 - 9 (direct); 10 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (2 - 10 A) … MULT of 80 - 140% of CT primary | COM: C00 - C07; RS485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (0.3 - 2.0) … MULT or 60% of CT primary or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 2; 25; 50; 75; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 172 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (default) | 0; 1.0 - 9.8 A … MULT or 40 - 140% of CT primary | 170 - 524 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
200 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 1 - 4.5: 3 phase (looped conductors required); 2 - 9: 3 phase (direct) | 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 | (2 - 10 A) … MULT | A01 - A99 | ±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% | (0.3 - 2.0) … MULT or 10 - 30% or OFF | % of setpoint / Trip time: 101 - 200% / 8s ± 1s; 30s; 201 - 300% / 4s ± 1s; 301 - 400% / 3s ± 1s; 401%+ / 2s ± 1s | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; or 100 - 800 ratio | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | LV setting - 528 V | 3 | IP20 (finger safe) | 0; 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults: 2 - 500 m; # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | 2 - 60 s | 0; 1.0 - 9.8 A … MULT | 170 V - HV setting | ±1% | 2 - 15% or 999 | |||||||
100 - 240 Vac | SPDT - Form C | Torque: 7 in-lbs | 10 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | 80 - 140% of CT primary | COM: C00 - C07; RS485: A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | 6 A - 40% of CT primary or OFF | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 25; 50; 75; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 86 - 264 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (default) | 40 - 140% of CT primary | 85 - 262 V | ±1% | 2 - 25% or 999 (disabled) | |||||||||
200 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 20 (looped conductors required); 20 - 90 (direct); 90 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 02 - 60; J02 - J60; L00 - L60; or OFF | (20 - 100 A) … MULT of 80 - 140% of CT primary | A01 - A99 | ±3% (<100 A direct) | 2 - 50% or 999 (disabled) | ±15% | (3 - 20) … MULT or 12 - 40% of CT primary or OFF | 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 | 172 - 528 V | 3 | IP20 (finger safe) | 0 - 999 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m; Undercurrent: 2 - 500 m A (Automatic); # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | ±0.5 s | 2 - 999 s (default) | 0; 10 - 98 A … MULT or 40 - 140% of CT primary | 170 - 524 V | ±1% | 2 - 25% or 999 (disabled) | ||||||||||
200 - 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 - 120% of CT primary | A01 - A99 | ±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 - 20) … MULT or 10 - 30% of primary CT or OFF | % of setpoint / Trip time: 101 - 200% / 8s ± 1s; 30s; 201 - 300% / 4s ± 1s; 301 - 400% / 3s ± 1s; 401%+ / 2s ± 1s | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; or 100 - 800 ratio | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | LV setting - 528 V | 3 | IP20 (finger safe) | 0; 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults: 2 - 500 m; # of Restarts: All faults except undercurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A; ocA (Automatic); Undercurrent: 0; 1; 2; 3; 4; 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 | 2 - 60 s | 0; 10 - 98 A … MULT or 40 - 140% of CT primary | 170 V - HV setting | ±1% | 2 - 15% or 999 |
777 Applications
- Conveyor systems
- HVAC equipment
- Saws and grinders
- Fan motors
Series: 777 Resources
![Motor Protection Brochure](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_sJWJ1NEf81gGZgNI.jpg%3F1728651838&w=3840&q=75)
Motor Protection Brochure
Learn about our voltage and phase monitors, ground fault relays, overload relays, and motor protection systems.
![Good-Better-Best-Flyer-Spanish](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_UbknAk40HQj21czp.jpg%3F1723095041&w=3840&q=75)
Good Better Best Flyer - Spanish
![Resource](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2F1280_QwmiVon6OUD41M3K.jpg%3F1733464504&w=3840&q=75)
Circuit Protection Selection Guide
Consult this guide to learn about circuit protection considerations and the solutions Littelfuse offers. Tables help match products with applications.
![Resource](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_aZLGIXCr81goeYza.jpg%3F1721307098&w=3840&q=75)
MODBUS Master Software Development Guide For Network Programmable Model 777s
![777-TS-A1 Engineering Specs](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_QUSmWQp3G2241kXo.jpg%3F1721306473&w=3840&q=75)
777-TS-A1 Engineering Specs
![PG-777P2-MBDN-B Manual](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_otWz9pMTbOt51fwH.jpg%3F1721302257&w=3840&q=75)
PG-777P2-MBDN-B Manual
![777-LR-P Engineering Specs](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_67OELVkOhv91YBOE.jpg%3F1721301070&w=3840&q=75)
777-LR-P Engineering Specs
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777-HVR-SP-A1 Engineering Specs
![777-HRG-P2-A1 Engineering Specs](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_2wtV3ZfHlld91kU0.jpg%3F1721298389&w=3840&q=75)
777-HRG-P2-A1 Engineering Specs
![777-LR Engineering Specs](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_E8cp88F1FCi65YHK.jpg%3F1721297191&w=3840&q=75)
777-LR Engineering Specs
![777-HVR-P2-B Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_skvox3bXThU02Efb.jpg%3F1721297168&w=3840&q=75)
777-HVR-P2-B Installation Instructions
![777-MV-FT Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_MC3QlXzbE1N12sNV.jpg%3F1721296578&w=3840&q=75)
777-MV-FT Installation Instructions
![777-FT-A1 Engineering Specs](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_62wLqJv0Rw61clpJ.jpg%3F1721295635&w=3840&q=75)
777-FT-A1 Engineering Specs
![777-MV Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_sgZ1IuCPf91kRLih.jpg%3F1720660308&w=3840&q=75)
777-MV Installation Instructions
![777 Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_oYHcLAcyU02k4RCO.jpg%3F1720660305&w=3840&q=75)
777 Installation Instructions
![777-HRG-P2-B Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_zR5xw8lfEg71ghYh.jpg%3F1720660301&w=3840&q=75)
777-HRG-P2-B Installation Instructions
![777-HVR Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_o3ZQ4FvMnl71Apc3.jpg%3F1720660294&w=3840&q=75)
777-HVR Installation Instructions
![777-HVR-LR Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_6nnHHRunCAD92MmM.jpg%3F1720660291&w=3840&q=75)
777-HVR-LR Installation Instructions
![777-HVR-NP Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_si8e7lcSLfn22QCp.jpg%3F1720660289&w=3840&q=75)
777-HVR-NP Installation Instructions
![777-LR Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_EHXB4bMEfR5022Rn.jpg%3F1720660289&w=3840&q=75)
777-LR Installation Instructions
![777-FT-B Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_MmWQ0Hcdzf29EE3e.jpg%3F1720660288&w=3840&q=75)
777-FT-B Installation Instructions
![Resource](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_o2ZdOST0tHI48ELE.jpg%3F1718312789&w=3840&q=75)
777-LR-P2, 777-575-LR-P2 Installation Instructions
![777-P2-B Installation Instructions](/_next/image?url=https%3A%2F%2Fcdn2.webdamdb.com%2Fmd_6Mv7VfKsrYA66UlD.jpg%3F1718312783&w=3840&q=75)