777 Series - 3-Phase Current & Voltage Monitor

littelfuse Motor and Pump Protection Relays
Roll Over to Zoom

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)Compare
777-575-HRG-P2500 to 600VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 20A (looped conductors only); 20 - 90A direct3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-575-LR-P2500 to 600VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount1 - 9A 10 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-575-P2500 to 600VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 20A (looped conductors required); 20 - 80A (direct); 90 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-575-TS500 to 600VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 25A 3 phase (loops required); 25 - 90A 3 phase (direct); 80 - 800A 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)1.56 lbs. (25.0 oz. 707.6 g)
777-FT200 - 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 25A 3 phase (loops required); 25 - 90A 3 phase (direct); 80 - 800A 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)1.56 lbs. (25.0 oz. 707.6 g)
777-HRG-P2200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 20A (looped conductors required); 20 - 90A (direct)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-HVR-LR-P2340 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount1 - 9A (direct); 10 - 800A (with external CTs)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-HVR-P2340 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 20A (looped conductors required); 20 - 90A (direct); 90 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-LR-HRG-P2200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount10 - 800A (external CTs required external zero-seq. CT required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-LR-P2200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount1 - 9A 10 - 800A (with external CTs)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-LR-TS200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount1 - 4.5A 3 phase (loops required); 2 - 9A 3 phase (direct)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-MRSWConnect 9-pin adapter to 777 communication port24î (609.6 mm) long
777-MV-P2100 to 240VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount10 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-P2200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 20A (looped conductors required); 20 - 90A (direct); 80 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777-TS200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 25A 3 phase (loops required); 25 - 90A 3 phase (direct); 80 - 800A 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)1.56 lbs. (25.0 oz. 707.6 g)
777VA-02200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 25A (looped conductors required); 25 - 90A (direct); 80 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)
777VA-03200 to 480VACSPDT - Form CTorque: 7in-lbsSurface mount (4 - #8 screws) on DIN rail mount2 - 25A (looped conductors required); 25 - 90A (direct); 80 - 800A (external CTs required)3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)1.56 lbs. (25.0 oz. 707.6 g)