Link has been copied to clipboardSeries: 77C
Littelfuse 77C Current & Voltage Monitor Provides Exceptional Protection
The single-phase 77C unit is a fully-programmable, electronic overload relay designed to protect any motor drawing 2-800 full load A (external CTs are required above 90 A). Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. The 77C and 777-HVR-SP (family of products) are for single-phase 100-240 V ac applications.
All of the overload relays provide unsurpassed protection by combining overload, underload, and voltage in one unit. 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. These units also feature a communications network 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.
- 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
- Visual indication for programming, viewing real-time voltage or current, and last fault code
- Allows usage on a 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. 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
77C Parts
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| 340 - 480 Vac | SPDT - Form C | Torque: 7 in-lbs | 2 - 25 (looped conductors required); 26 - 90 (direct); 80 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 5; J5; 10; J10; 15; J15; 20; J20; 30; J30; or lin (linear) | (20 - 100 A) … MULT of 80 - 120% of CT primary | A01 - A99 | ±3% (<100 A direct) | ±15% | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; 100; 150; 200; 300; 400; 500; 600; 700; 800 | Pilot Duty: 470 VA @ 600 Vac B600; General Purpose: 10 A @ 240 Vac | 3 | IP20 (finger safe) | 0; 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (<100 A direct) | All faults except undercurrent: 2 - 500 m/s; Undercurrent: 2 - 500 m/s A (Automatic); # of Restarts: 0; 1; 2; 3; 4; A (Automatic) | Max conductor size: 0.65 in (with insulation) | 100 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | ±0.5 s | 2 - 60 s | 0; 10 - 98 A … MULT or 40 - 100% of CT primary | 340 - HV setting | ±1% | ||||||
| 100 - 240 Vac | SPDT - Form C | 7 in.-lbs. | 2 - 25 (looped conductors required); 26 - 90 (direct); 91 - 800 (external CTs required) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 5; J5; 10; J10; 15; J15; 20; J20; 30; J30; or lin (linear) | (20 - 100 A) … MULT of 80 - 120% of CT primary | A01 - A99 | ±3% (<100 A direct) | ±15% | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 - 10; or 100 - 800 ratio | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 85V - HV setting | 3 | IP20; NEMA 1 (finger safe) | 0; 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (direct; no external CTs) | 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) | Max conductor size: 0.65 in (with insulation) | UL: 100; CSA: 10 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | 5% ±1 s | 2 - 60 s | 0; 10 - 98 A … MULT or 40 - 100% of CT primary | LV setting - 264 V | ±1% | |||||
| 100 - 240 Vac | SPDT - Form C | 7 in.-lbs. | 1.0 - 2.5 (looped conductors required); 2.0 - 9.0 (direct) | 3.05 H x 3.85 W x 5.05 D in. (77.5 x 97.8 x 128.3 mm) | 0 Kg (kilogram) | 5; J5; 10; J10; 15; J15; 20; J20; 30; J30; or lin (linear) | (20 - 100 A) … MULT of 80 - 120% of CT primary | A01 - A99 | ±3% (<100 A direct) | ±15% | 10 - 95% non-condensing per IEC 68-2-3 | 50 / 60 | 10 | 1 or 2 | Pilot Duty: 480 VA @ 240 Vac B300; General Purpose: 10 A @ 240 Vac | 85V - HV setting | 3 | IP20; NEMA 1 (finger safe) | 0; 2 - 500 s | Voltage: ±0.5% of nominal voltage; Current: ±1% (direct; no external CTs) | 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) | Max conductor size: 0.65 in (with insulation) | UL: 100; CSA: 10 | IEC: 61000-4-5 Level 3 2 kV line-to-line; Level 4 4 kV line-to-ground | 5% ±1 s | 2 - 60 s | 0; 10 - 98 A … MULT or 40 - 100% of CT primary | LV setting - 264 V | ±1% |
77C Applications
- Conveyor systems
- HVAC equipment
- Saws and grinders
- Fan motors
