Littelfuse® 777-P2 Fully Programmable Overload Relay, 2 to 20 A, SPDT Contact Form

Overload Relays
1154578 MFG #: 777-P2
1016.49000 / ea
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.
  • Features
Visual indication for programming, viewing real-time voltage or current, and last fault code built-in display
Allows usage on wide range of systems programmable voltage and current settings
3 selectable restart options choose from automatic, semi-automatic, or manual to best meet individual application needs
3 programmable restart delay timers separate restart delay time for rapid cycle protection, motor cool down, and dry-well recovery
Increases safety through remote display of real-time data and fault history, without the need to open the cabinet
Flexible reset can be done through pushbutton on relay or remotely with optional 777-MRSW or OL-RESET remote reset kit
Compatible with Modbus, DeviceNet, Profibus, or Ethernet using optional communications module
+/- 0.5 sec time accuracy
100 kA short circuit