777 Series - 3-Phase Current & Voltage Monitor

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The 777 is a fully programmable electronic overload relay designed to protect any motor drawing 2-800 full load amps (external CTs are required above 90 amps). The 777 (family of products) is for 3-phase 200-480VAC 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 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 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.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Termination TypeMounting MethodFull Load Amp Range (A)DimensionsWeight (lbs/g)Overcurrent Trip ClassOvercurrent Trip PointAddressCurrent Accuracy (%)Current Unbalance Trip Delay (s)Current Unbalance Trip Point (%)Ground Fault Accuracy (%)Ground Fault Current Trip Point (A)StockCompare
777-575-HRG-P2500 - 600 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 20 (looped conductors required); 20 - 90 direct3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)0 Kg02 - 60; J02 - J60; L00 - L60; or OFF2 - 100A with proper loopingCOM: C00 - C07; RS-485: A01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%(1 - 10) … MULT or OFFCheck
777-575-LR-P2500 - 600 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount1 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(2 - 100 A) … MULT of 80 - 140% of CT primaryCOM: 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 OFFCheck
777-575-P2500 - 600 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(20 - 100 A) … MULT of 80 - 140% of CT primaryA01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%(3 - 20) … MULT or 12 - 40% of primary CT or OFFCheck
777-FT200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 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 Kg5; J5; 10; J10; 15; J15; 20; J20; 30; J30; J100 (J100 = Linear)(20 - 100 A) … MULT of 80 - 120% of CT primaryA01 - 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% / 2s2 - 25% or 999 (disabled)±15%(3 - 20) … MULT or 10 - 30% of primary CT or OFFCheck
777-HRG-P2200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 20 (looped conductors required); 20 - 90 direct3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)0 Kg02 - 60; J02 - J60; L00 - L60; or OFF2 - 100A with proper loopingCOM: C00 - C07; RS485: A01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%(1 - 10) … MULT or OFFCheck
777-HVR-LR-P2340 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount1 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(2 - 10 A) … MULT of 80 - 140% of CT primaryCOM: 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 OFFCheck
777-HVR-P2340 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(20 - 100 A) … MULT of 80 - 140% of CT primaryCOM: 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 OFFCheck
777-LR-P2200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount1 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(2 - 10 A) … MULT of 80 - 140% of CT primaryCOM: 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 OFFCheck
777-LR-TS200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount1 - 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 Kg5; J5; 10; J10; 15; J15; 20; J20; 30; J30(2 - 10 A) … MULTA01 - 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% / 2s2 - 25% or 999 (disabled)±15%(0.3 - 2.0) … MULT or 10 - 30% or OFFCheck
777-MRSWConnect 9-pin adapter to 777 communication port24 L in.0 KgCheck
777-MV-P2100 - 240 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount10 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF80 - 140% of CT primaryCOM: C00 - C07; RS485: A01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%6 A - 40% of CT primary or OFFCheck
777-P2200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 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 Kg02 - 60; J02 - J60; L00 - L60; or OFF(20 - 100 A) … MULT of 80 - 140% of CT primaryA01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%(3 - 20) … MULT or 12 - 40% of CT primary or OFFCheck
777-TS200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 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 Kg5; J5; 10; J10; 15; J15; 20; J20; 30; J30(20 - 100 A) … MULT of 80 - 120% of CT primaryA01 - 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% / 2s2 - 25% or 999 (disabled)±15%(3 - 20) … MULT or 10 - 30% of primary CT or OFFCheck
777VA-02200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 25 (looped conductors required); 25 - 90 (direct); 80 - 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 Kg02 - 30; J02 - J30; L00 - L60; or OFF(20 - 100 A) … MULT of 80 - 140% of CT primaryA01 - A99±3% (<100 A direct)2 - 25% or 999 (disabled)±15%(3 - 20) … MULT or 12 - 80% of primary CT or OFFCheck
777VA-03200 - 480 VacSPDT - Form CTorque: 7 in-lbsSurface mount (4 - #8 screws) or DIN rail mount2 - 25 (looped conductors required); 25 - 90 (direct); 80 - 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 Kg02 - 30; J02 - J30; L00 - L60; or OFF(20 - 100 A) … MULT of 80 - 140% of CT primaryA01 - A99±3% (<100 A direct)2 - 50% or 999 (disabled)±15%(3 - 20) … MULT or 12 - 80% of primary CT or OFFCheck

CAD-DWG-icon 777 CAD Drawing

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