Motor and Pump Protection Relays
777-KW/HP-P2 Series
3-Phase Current & Voltage Monitor
Power is Linear, equal
Current is not linear, low
sensitivity for low loads
and high sensitivity
for high loads.
sensitivity at both
low and high
loads.
No Load
Full Load
No Load
Full Load
Description
The 777-KW/HP-P2 is a 3-phase current and voltage monitor that provides unsurpassed protection by combining overload,
voltage, phase loss and reversal, voltage and current unbalance, power monitoring*, and underload trip based on power
into one efficient unit. The underpower trip feature is desirable anytime the current vs. load characteristic is non-linear or
has little change. In general terms, smaller motors and slow-speed motors have little change in current over the normal
load range. Larger motors that are running light loads will also show small current changes over the operating load range.
The low and high power protection feature increases reliability for non-linear motors where the load characteristic has
little change.
For standalone applications, these 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. These units also feature
a communications network 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.
*Low current trip and high power trip are network programmable only.
**DeviceNet is a trademark of its respective owner.
Features & Benefits
FEATURES
BENEFITS
Visual indication for programming, viewing real-time voltage, current,
kilowatts, horsepower, and last fault code
Built-in display
Programmable voltage and current settings
3 selectable restart options
Allows usage on wide range of systems
Choose from automatic, semi-automatic, or manual to best meet
individual application needs
Program separate restart delay time for rapid cycle protection, motor
cool down, and dry-well recovery
3 programmable restart delay timers
Remote display compatibility
Flexible reset
Increases safety through remote display of real-time data and fault
history without the need to open the cabinet. Aids with arc flash
safety regulations.
Reset can be done through a push button on the relay or remotely
with optional 777-MRSW or OL-Reset remote reset kit
Applications
• Conveyor systems
• HVAC equipment
• Saws and grinders
• Fan motors
Littelfuse.com/777kwhpp2
©2022 Littelfuse, Inc.
Specifications are subject to change without notice.
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Revised: 10/03/2022