Littelfuse 777 Series Quick start guide

© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Motor and Pump Protection - Single-Phase Motor Protection
www.littelfuse.com/777-77c
Rev: 1-A-062816
777 / 77C SERIES
Description
The 777/ 77C 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). Common
applications include conveyor systems, HVAC equipment, saws
and grinders, fan motors, and almost any pumping application.
All of the overload relays provide unsurpassed protection by
combining overload, underload, and voltage 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 & Benefits
FEATURES BENEFITS
Built-in display Visual indication for programming, viewing real-time
voltage or current, and last fault code
Programmable voltage
and current settings Allows usage on wide range of systems
3 selectable
restart options
Choose from automatic, semi-automatic, or manual to
best meet individual application needs
3 programmable restart
delay timers
Program separate restart delay time for rapid cycle
protection, motor cool down, and dry-well recovery
Remote display
compatibility
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
Flexible reset
Reset can be done through pushbutton on relay or
remotely with optional 777-MRSW or OL-RESET
remote reset kit
Network
communications
capability
Compatible with Modbus, DeviceNet™, Profibus, or
Ethernet using optional communications module
Ordering Information
MODEL LINE VOLTAGE MOTOR FULL
AMP RANGE DESCRIPTION
77C 100-240VAC
2-800A (external
CTs required
above 90A)
Provides 480VA @ 240VAC
output SPDT relay contacts
77C-LR 100-240VAC 1-9A only Provides 480VA @ 240VAC
output SPDT relay contacts
777-
HVR-SP 340-480VAC
2-800A (external
CTs required
above 90A)
Provides 470VA @ 600VAC
output SPDT relay contacts.
For systems with no control
power transformer
Single-Phase Current & Voltage Monitor
Wiring Diagram
A B C
LITTELFUSE RECOMMENDS USING CTs THAT HAVE TERMINALS
TO AID CONVENIENCE WHEN INSTALLING CTs.
NOTE: PHASES A & C ARE INACTIVE. USE PHASE B FOR ALL ACTIVE
CURRENT MEASUREMENTS. CT SECONDARY MUST MAKE FIVE
PASSES THROUGH THE PHASE B CONDUCTOR WINDOW.
TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH MOTOR CONTROL
TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH EXTERNAL CT

© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Motor and Pump Protection - Single-Phase Motor Protection
www.littelfuse.com/777-77c
Rev: 1-A-062816
777 / 77C SERIES
Accessories
RS485MS-2W Communication Module
(for limited Modbus capabilities) Required to
enable the Modbus communications function on
Model 77X-type products.
Communication Adapters
• RS485-RS232–Converter with cable & plug
• RS485-USB–Converter with cable & plug
• RS232-USB–Converter
Specifications match industry standard.
RM1000 Remote Monitor
The RM1000/777 motor management system
combines unsurpassed electronic motor
protection and critical, user-friendly, motor
monitoring for up to 16 devices.
RM2000 Remote Monitor
The RM2000/777 motor management system
combines unsurpassed electronic motor
protection and critical, user-friendly, motor
monitoring with event storage and real-time
clock for date and time stamp.
Solutions Software: Solutions-M
Software features include data logging, real-time
data monitoring and fault and event monitoring.
777-MRSW Manual Remote Reset Kit
Allows the 777 line of MotorSaver®and
PumpSaver®products to be manually reset
without opening the panel door.
OL-RESET Manual Remote Reset Kit
Allows the 777 line of MotorSaver®and
PumpSaver®products to be manually reset
without opening the panel door.
Specifications
Frequency 50/60Hz
Functional Characteristics
TC- Overcurrent Trip Class
(77C, 777 non-Plus
Series units) 5, 10, 15, 20, 30 (J prefix enables jam
protection feature)
Output Characteristics
Output Contact Rating
(SPDT - Form C)
Pilot duty rating 480VA @ 240VAC, B300
General purpose 10A @ 240VAC
Pilot duty rating for
HVR models 470VA @ 600VAC, B600
General Characteristics
Ambient Temperature Range
Operating -20° to 70°C (-4° to 158°F)
Storage -40° to 80°C (-40° to 176°F)
Accuracy
Voltage ±1%
Current ±3%(<100 amps direct)
GF Current ±15%
Timing (77C, 777 non-Plus
Series units) 5% +1 second
Repeatability
Voltage ±0.5% of nominal voltage
Current ±1% (<100 amps direct)
Maximum Input Power 10 W
Pollution Degree 3
Class of Protection IP20
Relative Humidity 10-95%, non-condensing per IEC 68-2-3
Terminal Torque 7 in.-lbs.
Standards Passed
Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6kV contact, 8kV air
Radio Frequency Immunity
(RFI), Conducted IEC 61000-4-6, Level 3 10V/m
Radio Frequency Immunity
(RFI), Radiated IEC 61000-4-3, Level 3 10V/m
Fast Transient Burst IEC 61000-4-4, Level 3, 3.5kV input power
Short Circuit 100kA
Surge
IEC 61000-4-5, Level 3, 2kV line-to-line; Level 4,
4kV line-to-ground
ANSI/IEEE C62.41 Surge and Ring Wave Compliance to a
level of 6kV line-to-line
Hi-potential Test Meets UL508 (2 x rated V +1000V for 1 minute)
Vibration IEC 68-2-6, 10-55Hz, 1mm peak-to-peak,
2 hours, 3 axis
Shock IEC 68-2-27, 30g, 3 axis, 11ms duration,
half-sine pulse
Safety Marks
UL UL508, UL1053 (File #E68520)
CE IEC 60947-1, IEC 60947-5-1
CSA C22.2
Maximum Conductor Size
(with insulation) through
777/77C 0.65”
Dimensions H 77.47 mm (3.05”); W 97.79 mm (3.85”);
D 128.27 mm (5.05”)
Weight 1.56 lbs. (24.96 oz., 707.6 g)
Mounting Method Surface mount (4 - #8 screws) or DIN rail mount