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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Symcom / Littelfuse |
| Manufacturer Product Number | 777-HVR-SP |
| Description | Phase Monitor Relay; OL/UL/UV/OV; 1-Phase; 340-480V; 2-800A FLA; 1C SPDT |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 777-HVR-SP is a single-phase electronic motor overload relay for 340-480 V AC motors drawing 2-800 full-load amps (external CTs required above 90 A). It protects against overload, underload, undervoltage and overvoltage. Built for: Single-phase systems with no control power transformer: 600 V-rated output contacts.
Overcurrent trip class: 5, 10, 15, 20 or 30 (J prefix enables jam protection). Restart delays: 3 programmable timers: rapid cycle, motor cool-down and dry-well recovery. Reset: Automatic, semi-automatic or manual (selectable); push button on the relay or remote with a 777-MRSW or OL-Reset kit. Display: 3-digit LED display: programming, real-time voltage and current, last fault code. Networking: Modbus, DeviceNet, Profibus or Ethernet via optional communication module; up to 99 units networked.
Output: 1C SPDT, 10 A at 240 V AC. Mounting: DIN Rail/Panel Mount. Dimensions: 77.47 x 97.79 x 128.27 mm (3.05 x 3.85 x 5.05 in), H x W x D.
It operates from -20 to +70 °C and can be stored from -40 to +80 °C. Approvals: UL 508, UL 1053, CSA C22.2, CE.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Monitoring Function | Overload, Underload, Undervoltage and Overvoltage |
| Special Application | Single-phase systems with no control power transformer: 600 V-rated output contacts |
| Number of Phases | 1-Phase |
| Input Voltage | (340...480)V AC |
| Motor Full Load Current Range | 2-800 A (external CTs required above 90 A) |
| Overcurrent Trip Class | 5, 10, 15, 20 or 30 (J prefix enables jam protection) |
| Restart Delay (s) | 3 programmable timers: rapid cycle, motor cool-down and dry-well recovery |
| Reset Method | Automatic, semi-automatic or manual (selectable); push button on the relay or remote with a 777-MRSW or OL-Reset kit |
| Status Indicator | 3-digit LED display: programming, real-time voltage and current, last fault code |
| Communication Protocol | Modbus, DeviceNet, Profibus or Ethernet via optional communication module; up to 99 units networked |
| Contact Configuration | 1C SPDT |
| Output Rating | 10 A at 240 V AC |
| Mounting Type | DIN Rail/Panel Mount |
| Dimensions | 77.47 x 97.79 x 128.27 mm (3.05 x 3.85 x 5.05 in), H x W x D |
| Operating Temperature (Storage) | -20...+70 °C (-40...+80 °C) |
| Approvals | UL 508, UL 1053, CSA C22.2, CE |