Protection Relays
Motor and Pump Protection - Single-Phase Pump Protection
77C-KW/HP SERIES
Single-Phase Current & Voltage Monitor
Description
The 77C-KW/HP and 77C-LR-KW/HP are fully programmable
pump protection relays which will monitor the voltage and
current for high or low voltage, overload and underload
conditions based on power, in one package. 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.
Common uses include pumping applications where motors run
slower than around 3400 rpm and usually have small current vs
load changes; such as slow speed mixer or agitator motors up to
50 hp, and magdrive or can pumps.
Power is Linear, equal
sensitivity at both
low and high
loads.
Current is not linear, low
sensitivity for low loads
and high sensitivity
for high loads.
Wiring Diagram
TYPICAL WIRING DIAGRAM FOR MODEL 77C-KW/HP
WITH MOTOR CONTROL
L1
L2
COIL
CONTACTOR
No Load
Full Load
Current
No Load
Power
Full Load
CONTROL
POWER
240 VAC
OR LESS
The Littelfuse PumpSaver relay provides the high sensivity of a
power monitor to protect pump motors from dry run and dead
head conditions.
A
B
C
NOTE:
PHASES A & C
ARE INACTIVE.
Features & Benefits
FEATURES
BENEFITS
Increases reliability for non-linear motors where the
load characteristic has little change
Visual indication for programming, viewing real-time
voltage, current, kilowatts or horsepower, and last
fault code
Allows user flexibility to fine-tune the relay for
maximum protection in any application.
Provides instant troubleshooting diagnostics
Increases safety through remote display of run-hour
meter, last four fault codes, without the need to open
the cabinet. Aids with arc flash safety regulations.
Reset options: automatic, manual using pushbutton
on relay, or remotely with optional 777-MRSW
remote reset kit.
Compatible with Modbus using optional
communications module (RS485MS-2W)
Underload protection
Built-in display
15 programmable
criteria settings
START
M
STOP HAND
OFF
PILOT AUTO
TO MOTOR
TYPICAL WIRING DIAGRAM FOR MODEL 77C-KW/HP WITH EXTERNAL CT
A
LITTELFUSE RECOMMENDS USING CTs THAT HAVE TERMINALS TO AID
B
CONVENIENCE WHEN INSTALLING CTs.
Last fault memory
Remote display
compatibility
Flexible reset
10 - 12 AWG
STRANDED WIRE
A
120-240VAC 1Ø
50/60 HZ
B
PILOT DUTY RATING
480VA AT 240VAC
C
Network
communications
capability
Ordering Information
MODEL
LINE
VOLTAGE
MOTOR FULL
AMP RANGE
DESCRIPTION
1Ø
MOTOR
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.
NOTE:
OTHER NECESSARY CONNECTIONS ARE NOT SHOWN
77C-KW/HP
2-90A (external CTs
100-240VAC
required above 90A)
1-9A (external CTs
required above 9A)
Provides 480VA @
240VAC output SPDT
(Form C) relay contacts
Provides 480VA @
240VAC output SPDT
(Form C) relay contacts
Rev: 1-A-062816
77C-LR-KW/HP 100-240VAC
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/77ckwhp
www.littelfuse.com/
Protection Relays
Motor and Pump Protection - Single-Phase Pump Protection
77C-KW/HP 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.
Standards Passed
Electrostatic Discharge (ESD)
Radio Frequency Immunity
(RFI), Conducted
Radio Frequency Immunity
(RFI), Radiated
Fast Transient Burst
Surge
IEC
Mechanical
Dimensions
Terminal Torque
Enclosure Material
Weight
Maximum Conductor Size
Through 777
Environmental
Temperature Range
Ambient Operating
Ambient Storage
Pollution Degree
Class of Protection
Relative Humidity
Programmable
Operating Points
LV- Low Voltage Threshold
HV- High Voltage Threshold
MULT- # of Conductors or
CT Ratio (XXX:5)
77C:
77C-LR:
OC- Overcurrent Threshold
CUB- Current Unbalance
Threshold
TC- Overcurrent Trip Class *
RD1- Rapid Cycle Timer
RD2- Restart Delay After All
Faults Except Undercurrent
(motor cool down timer)**
RD3- Restart Delay
After Undercurrent
(dry well recovery timer)
#RU- Number of Restarts
After Undercurrent
ADDR- RS485 Address
#RO-Number of Restarts
After Overcurrent
LP/PWS (PWS = LP Range)
IEC 1000-4-2, Level 3, 6kV contact, 8kV air
IEC 1000-4-6, Level 3 10V/m
IEC 1000-4-3, Level 3 10V/m
IEC 61000-4-4, Level 3, 3.5kV input power
1000-4-5, Level 3, 2kV line-to-line; Level 4,
H
78.74 mm (3.1”);
W
99.06 mm (3.9”);
D
129.54 mm (5.1”)
7 in.-lbs.
polycarbonate
1.2 lbs
0.65” with insulation
-20° - 70° C (-40° - 158°F)
-40° - 80° C (-40° - 176°F)
3
IP20, NEMA 1
10-95%, non-condensing per IEC 68-2-3
Range
85V - HV Setting
LV Setting - 264V
Specifications
Input Voltage
Frequency
Motor Full Load Amp Range
77C-KW/HP
77C-LR-KW/HP
Short Circuit Withstand
Rating
Power Consumption
Output Contact Rating SPDT
(Form C)
Expected Life
Mechanical
Electrical
Accuracy at 25° C (77° F)
Voltage
Current
Timing
Repeatability
Voltage
Current
Safety Marks
CE
100-240 VAC, 1Ø
50-60 Hz
2-25 Amps, 3Ø(Loops Required)
26-90 Amps, 3Ø(Direct)
91-800 Amps, 3Ø(External CT’s)
1.0 Amps - 2.5 Amps (1 Loop)
2.0 Amps - 9.0 Amps (Direct)
100kA per UL and CSA
5W (Maximum)
Pilot duty rating: 480 VA @ 240 VAC
General purpose: 10A @ 240 VAC
1 x 10
6
operations
1 x 10
5
operations at rated load
±1%
±3% (Direct, No External CT’s)
5% ± 1 second
± 0.5% of nominal voltage
± 1% (Direct, No External CT’s)
UL UL508, UL1053
IEC 60947-1, IEC 60947-5-1
1-10 Conductors or 100-800 Ratio
1 or 2
(20-100A) ÷ MULT or 80-120% of CT Primary
2 - 25% or 999
5, J5, 10, J10, 15, J15, 20, J20, 30, J30, or
LIn (linear)
0, 2 - 500 Seconds
2 - 500 Minutes/Seconds
2 - 500 Minutes/Seconds
0, 1, 2, 3, 4, A(Automatic)
A01- A99
0, 1, 2, 3, 4, A(Automatic)
1
= 0.01 - 0.99 KW
5
= 0.01 - 0.99 HP
2
= 1.00 - 9.95 KW
6
= 1.00 - 9.95 HP
3
= 10.0 - 99.5 KW
8
= 10.0 - 99.5 HP
4
= 100 - 650 KW
9
= 100 - 650 HP
* If J Prefix is displayed in trip class setting, jam protection isenabled. If programmed to Lin
position, overcurrent trip delays are fixed linear-type delays set in OPT1 position.
** RD2 & RD3 can be changed from minutes to seconds under program position OPT2.
SETTING
0
1
RD2
Minutes
Minutes
RD3
Minutes
Seconds
SETTING
2
3
RD2
Minutes
Seconds
RD3
Minutes
Seconds
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/77ckwhp
www.littelfuse.com/
Rev: 1-A-062816
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