Protection Relays
Motor and Pump Protection - Single-Phase Motor Protection
777 / 77C SERIES
Single-Phase Current & Voltage Monitor
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.
Wiring Diagram
TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH MOTOR CONTROL
Features & Benefits
FEATURES
Built-in display
Programmable voltage
and current settings
3 selectable
restart options
3 programmable restart
delay timers
Remote display
compatibility
Flexible reset
Network
communications
capability
BENEFITS
Visual indication for programming, viewing real-time
voltage or current, and last fault code
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
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 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
TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH EXTERNAL CT
LITTELFUSE RECOMMENDS USING CTs THAT HAVE TERMINALS
TO AID CONVENIENCE WHEN INSTALLING CTs.
Ordering Information
A
B
C
MODEL
LINE VOLTAGE
MOTOR FULL
AMP RANGE
DESCRIPTION
77C
77C-LR
777-
HVR-SP
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.
100-240VAC
100-240VAC
2-800A (external
CTs required
above 90A)
1-9A only
2-800A (external
CTs required
above 90A)
Provides 480VA @ 240VAC
output SPDT relay contacts
Provides 480VA @ 240VAC
output SPDT relay contacts
Provides 470VA @ 600VAC
output SPDT relay contacts.
For systems with no control
power transformer
340-480VAC
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/777-77c
Rev: 1-A-062816
Protection Relays
Motor and Pump Protection - Single-Phase Motor Protection
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
Functional Characteristics
TC- Overcurrent Trip Class
(77C, 777 non-Plus
Series units)
Output Characteristics
Output Contact Rating
(SPDT - Form C)
Pilot duty rating
General purpose
Pilot duty rating for
HVR models
General Characteristics
Ambient Temperature Range
Operating
Storage
Accuracy
Voltage
Current
GF Current
Timing (77C, 777 non-Plus
Series units)
Repeatability
Voltage
Current
Maximum Input Power
Pollution Degree
Class of Protection
Relative Humidity
Terminal Torque
Standards Passed
Electrostatic Discharge (ESD)
Radio Frequency Immunity
(RFI), Conducted
Radio Frequency Immunity
(RFI), Radiated
Fast Transient Burst
Short Circuit
Surge
IEC
ANSI/IEEE
Hi-potential Test
Vibration
Shock
Safety Marks
UL
CE
CSA
Maximum Conductor Size
(with insulation) through
777/77C
Dimensions
Weight
Mounting Method
50/60Hz
5, 10, 15, 20, 30 (J prefix enables jam
protection feature)
480VA @ 240VAC, B300
10A @ 240VAC
470VA @ 600VAC, B600
-20° to 70°C (-4° to 158°F)
-40° to 80°C (-40° to 176°F)
±1%
±3%(<100 amps direct)
±15%
5% +1 second
±0.5% of nominal voltage
±1% (<100 amps direct)
10 W
3
IP20
10-95%, non-condensing per IEC 68-2-3
7 in.-lbs.
IEC 61000-4-2, Level 3, 6kV contact, 8kV air
IEC 61000-4-6, Level 3 10V/m
IEC 61000-4-3, Level 3 10V/m
IEC 61000-4-4, Level 3, 3.5kV input power
100kA
61000-4-5, Level 3, 2kV line-to-line; Level 4,
4kV line-to-ground
C62.41 Surge and Ring Wave Compliance to a
level of 6kV line-to-line
Meets UL508 (2 x rated V +1000V for 1 minute)
IEC 68-2-6, 10-55Hz, 1mm peak-to-peak,
2 hours, 3 axis
IEC 68-2-27, 30g, 3 axis, 11ms duration,
half-sine pulse
UL508, UL1053 (File #E68520)
IEC 60947-1, IEC 60947-5-1
C22.2
0.65”
H
77.47 mm (3.05”);
W
97.79 mm (3.85”);
D
128.27 mm (5.05”)
1.56 lbs. (24.96 oz., 707.6 g)
Surface mount (4 - #8 screws) or DIN rail mount
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/777-77c
Rev: 1-A-062816
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