Littelfuse 77C-LR, 77C Series, Single-Phase Current & Voltage Monitor, 100-240VAC, 1-9A only, Provides 480VA @ 240 V ac output SPDT relay contacts
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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.
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 (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 (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 UL 508 (2 x rated V +1000V 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, 30 g, 3 axis, 11 ms duration, half-sine pulse |
| Maximum Conductor Size (with insulation) through 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 UL 508, UL 1053 (File #E68520) CE IEC 60947-1, IEC 60947-5-1 CSA C22.2 |