The 777-FT is a 3-phase current and voltage monitor designed for motor protection in 200-480 V ac applications with a full load current range of 2-800 A, requiring external CTs above 90 A. It features a linear overcurrent trip with adjustable delay from 500 ms to 70 seconds, ideal for fast-trip applications such as chain drives, conveyors, and mixers. The unit includes a 3-digit LED display for programming and diagnostics, a 480 VA @ 240 V ac SPDT output relay, and supports remote reset and communications via Modbus, DeviceNet, Profibus, or Ethernet. It measures 77.47 mm H × 97.79 mm W × 128.27 mm D and mounts via surface mount or DIN-rail. Certified to UL508 and UL1053, it operates from -20 °C to 70 °C and meets IEC 61000-4 ESD, RFI, and surge immunity standards.
The 777-FT three-phase current and voltage monitor provides motor protection with input voltage from 200–480 V ac and motor full load ampere range as follows: 2–25 A: 3-phase (looped conductors required); 25–90 A: 3-phase (direct); 80–800 A: 3-phase (external CTs).
Industrial Relays Operator Interface for SB6000 Series
3-PHASE OVERLOAD RELAY/ 190-48
| Littelfuse, Inc. | VAST STOCK CO., LIMITED | Quarktwin Technology Ltd. | |
|---|---|---|---|
| Product Category | Protective Relays and Monitoring Relays | Electromechanical Relays | Protective Relays and Monitoring Relays |
| Product Number | 777-FT | 777-FT | 777-FT |
| Product Name | Littelfuse 777 Current & Voltage Monitor Provides Exceptional Motor Protection | Industrial Relays | Protection Relays & Systems |
| Current Sensitive Relay | Undercurrent |
