77C Series - Single-Phase Current & Voltage Monitor

77C-LR

The 77C-LR single-phase relay provides motor protection with input voltage from 100–240 V ac and motor full load ampere range as follows: 1.0–2.5 A (looped conductors required); 2.0–9.0 A (direct).


  • Electrical Characteristics
    • Catalog # 77C-LR
    • Input Voltage (V) 100 - 240 Vac
    • Maximum Input Power 10
    • Input AC Line Frequency (Hz) 50 / 60
    • Output Form SPDT - Form C
    • Output Load Rating (VA) Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac
    • Full Load Amp Range (A) 1.0 - 2.5 (looped conductors required); 2.0 - 9.0 (direct)
    • Timing Accuracy (%) 5% ±1 s
    • Rapid Cycle Timer (s) 0; 2 - 500 s
    • Restart Delay Range After Under/Overcurrent: 2 - 500 m/s; # of Restarts: Overcurrent: 0; 1; oc1; 2; oc2; 3; oc3; 4; oc4; A (Automatic); OCA; Undercurrent: 0; 1; 2; 3; 4; A (Automatic)
    • Repeat Accuracy (%) Voltage: ±0.5% of nominal voltage; Current: ±1% (direct; no external CTs)
    • Overvoltage Trip Voltage (%) 85V - HV setting
    • Undervoltage Trip Voltage LV setting - 264 V
    • Voltage Accuracy (%) ±1%
    • Overcurrent Trip Point (20 - 100 A) … MULT of 80 - 120% of CT primary
    • Overcurrent Trip Class 5; J5; 10; J10; 15; J15; 20; J20; 30; J30; or lin (linear)
    • Undercurrent Trip Point 0; 10 - 98 A … MULT or 40 - 100% of CT primary
    • Undercurrent Trip Delay (s) 2 - 60 s
    • Current Accuracy (%) ±3% (<100 A direct)
    • Ground Fault Accuracy (%) ±15%
    • Sensor Hole Size Max conductor size: 0.65 in (with insulation)
    • Short Circuit (kA) UL: 100; CSA: 10
    • Surge Protection IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground
    • Protection Class IP20; NEMA 1 (finger safe)
    • Pollution Degree 3
    • CT Ratio 1 or 2
    • Address A01 - A99
    • Termination Type 7 in.-lbs.
    • Mounting Method Surface mount (4 - #8 screws) or 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) 0 Kg
    • Check Stock Yes