777-FT - 777 MRSW Series

Series: 777 MRSW
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Littelfuse Remote Indication and Monitoring
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The 777 Manual Remote Reset Kit allows the 777 line of motor and pump protection products to be manually reset without opening the panel door. Simply connect the 9-pin adapter to the 777 communication port and mount the push-button switch in a convenient location.

Product Literature


Property (Mouseover for details) Value
Input Voltage (V) 200 - 480VAC
Maximum Input Power 10W
Output Form SPDT - Form C
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC B300; General Purpose: 10A @ 240VAC
Full Load Amp Range (A) 2 - 25A 3 phase (loops required); 25 - 90A 3 phase (direct); 80 - 800A 3 phase (external CTs)
Timing Accuracy (%) 5% ±1s
Rapid Cycle Timer (s)
Restart Delay Range
Repeat Accuracy (%) Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 amps direct)
Trip Delay Type
Overvoltage Trip Voltage (%) LV setting - 528V
Undervoltage Trip Voltage 170V - HV setting
Voltage Unbalance Trip Point (%) 2 - 15% or 999
Voltage Accuracy (%) ±1%
Overcurrent Trip Point (20A - 100A) … MULT of 80 - 120% of CT primary
Overcurrent Trip Class
Undercurrent Trip Point (0 10 - 98 Amps) … MULT or 40 - 100% of CT primary
Undercurrent Trip Delay (s) 2 - 60s
Current Unbalance Trip Point (%) 2 - 25% or 999 (disabled)
Current Unbalance Trip Delay (s) % over setpoint / Trip time: 1% / 30s; 2% / 15s; 3% / 10s; 4% / 7.5s; 5% / 6s; 6% / 5s; 10% / 3s; 15% / 2s
Current Accuracy (%) ±3% (<100 amps direct)
Ground Fault Current Trip Point (A) (3 - 20A) … MULT or 10 - 30% of primary CT or OFF
Ground Fault Trip Delay (s) % of setpoint / Trip time: 101 - 200% / 8s ± 1s; 30s; 201 - 300% / 4s ± 1s; 301 - 400% / 3s ± 1s; 401%+ / 2s ± 1s
Ground Fault Accuracy (%) ±15%
Sensor Hole Size Max conductor size: 0.65 in (with insulation)
Motor Acceleration Time Operating Point (s)
Short Circuit (kA) 10kA
Surge Protection IEC: 61000-4-5 Level 3 2kV line-to-line; Level 4 4kV line-to-ground
Protection Class IP20
Pollution Degree 3
CT Ratio 1 - 10 conductors or 100 - 800 ratio
Address A01 - A99
Life Electrical: 1 x 105 operations at rated load; Mechanical: 1 x 106
Termination Type Torque: 7in-lbs
Mounting Method Surface mount (4 - #8 screws) on DIN rail mount
Operating Temperature -20° to 70°C (-4° to 158°F)
Storage Temperature (F/C) -40° to 80°C (-40° to 176°F)
Humidity 10-95% non-condensing per IEC 68-2-3
Dimensions 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm)
Weight (lbs/g) 1.56 lbs. (25.0 oz. 707.6 g)
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