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777-LR-P2 - 777 Series

Item #: 777-LR-P2

Product Info

Littelfuse

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.

Item Specifications

  • ±3% (<100 amps direct)
  • 2 - 50% or 999 (disabled)
  • 1 - 9A 10 - 800A (with external CTs)
  • ±15%
  • (0.3 - 2.0A) … MULT or 60% of CT primary or OFF
  • 50/60Hz
  • 200 to 480VAC
  • 480 V
  • 10W
  • 158 °F
  • SPDT - Form C
  • Pilot Duty: 480VA @ 240VAC B300
  • General Purpose: 10A @ 240VAC
  • 02 - 60 J02 - J60 L00 - L60 or OFF
  • (2A - 10A) … MULT of 80 - 140% of CT primary
  • 172 - 528V
  • 0 - 999s
  • Voltage: ±0.5% of nominal voltage
  • Current: ±1% (<100 amps direct)
  • All faults except undercurrent: 2 - 500m
  • Undercurrent: 2 - 500m A (Automatic)
  • # of Restarts: All faults except undercurrent: 0 1 oc1 2 oc2 3 oc3 4 oc4 A ocA (Automatic)
  • Undercurrent: 0 1 2 3 4 A (Automatic)
  • Max conductor size: 0.65 in (with insulation)
  • 100kA
  • IEC: 61000-4-5 Level 3 2kV line-to-line
  • Level 4 4kV line-to-ground
  • ±0.5s
  • 2 - 999s (default)
  • (0 1.0 - 9.8 Amps) … MULT or 40 - 140% of CT primary
  • 170 - 524V
  • ±1%
  • 2 - 25% or 999 (disabled)
  • 25.0 oz
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