Littelfuse 777-FT, 777 Series, 3-Phase Current & Voltage Monitor, 200-480VAC, 2–800 A (external CTs required above 90 A)
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The 777 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). The 777 (family of products) is used for 3-phase, 200-480 V ac applications, with several specialized units for other voltage ranges and unique applications. Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. Some unique applications include use with a Subtrol* equipped Franklin submersible motor to detect high motor temperatures and applications where a fast linear trip is required.
All of the overload relays provide unsurpassed protection by combining overload, voltage, phase loss and reversal, voltage and current unbalance, power monitoring, and underload based on current — all 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 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.
*Subtrol and DeviceNet are trademarks of their respective owners
Applications
• Conveyor systems
• HVAC equipment
• Saws and grinders
• Fan motors
Pre-order 6-8 Weeks
Specifications
| Functional Characteristics | |
| Frequency | 50/60 Hz |
| TC- Overcurrent Trip Class (777 Plus Series units) | 02-60, J02-J60, L00-L60 or Off |
| TC- Overcurrent Trip Class (77C, 777 non-Plus Series units) | 5, 10, 15, 20, 30 (J prefix enables jam protection feature) |
| Output Characteristics | |
| Output Contact Rating (SPDT - Form C): |
Pilot duty rating 480 VA @ 240 V ac, B300 General purpose 10 A @ 240 V ac Pilot duty rating for HVR models 470 VA @ 600 V ac, B600 |
| General Characteristics | |
| Ambient Temperature Range: |
Operating -20 °C to 70 °C (-4 °F to 158 °F) Storage -40 °C to 80 °C (-40 °F to 176 °F) |
| Accuracy | |
| Voltage | ±1 % |
| Current | ±3 % (<100 amps direct) |
| GF Current | ±15 % |
| Timing (777 Plus Series units) | ±0.5 second |
| Timing (77C, 777 non-Plus Series units) | 5 % +1 second |
| Repeatability | |
| Voltage | ±0.5 % of nominal voltage |
| Current | ±1 % (<100 amps direct) |
| Maximum Input Power | 10 W |
| Pollution Degree | 3 |
| Class of Protection | IP20 |
| Relative Humidity | 10–95 %, non-condensing per IEC 68-2-3 |
| Terminal Torque | 7 in.-lbs |
| Standards Passed | |
| Electrostatic Discharge (ESD) | IEC 61000-4-2, Level 3, 6 kV contact, 8 kV air |
| Radio Frequency Immunity (RFI), |
Conducted IEC 61000-4-6, Level 3, 10 V/m Radiated IEC 61000-4-3, Level 3, 10 V/m |
| Fast Transient Burst | IEC 61000-4-4, Level 3, 3.5 kV input power |
| Short Circuit | 100 kA |
| Surge | |
| IEC | 61000-4-5, Level 3, 2 kV line-to-line; Level 4, 4 kV line-to-ground |
| ANSI/IEEE | C62.41 Surge and Ring Wave Compliance to a level of 6 kV line-to-line |
| Hi-potential Test | Meets UL508 (2 x rated V +1000 V for 1 minute) |
| Vibration | IEC 68-2-6, 10–55 Hz, 1 mm peak-to-peak, 2 hours, 3 axis |
| Shock | IEC 68-2-27, 30g, 3 axis, 11 ms duration, half-sine pulse |
| Maximum Conductor Size | |
| (with insulation) through 777/77C | 0.65” |
| Dimensions |
H 77.47 mm (3.05”) W 97.79 mm (3.85”) D 128.27 mm (5.05”) |
| Weight | 1.56 lbs. (24.96 oz., 707.6 g) |
| Mounting Method | Surface mount (4 - #8 screws) or DIN-rail mount |
| Certification & Compliance |
UL UL508, UL1053 (File #E68520) CSA C22.2 CE IEC 60947-1, IEC 60947-5-1 |