77C LITTELFUSE | Alldatasheet

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Technical content

Littelfuse.com/ 77C ©2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/30/2022 Motor and Pump Protection Relays 77C Series

Description

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. *Subtrol and DeviceNet are trademarks of their respective owners. Features & Benefits FEATURES BENEFITS Built-in display Visual indication for programming, viewing real-time voltage or current, and last fault code Programmable voltage and current settings Allows usage on a wide range of systems 3 selectable restart options Choose from automatic, semi-automatic, or manual to best meet individual application needs 3 programmable restart delay timers Program separate restart delay time for rapid cycle protection, motor cool down, and dry-well recovery Remote display compatibility Increases safety through remote display of real-time data and fault history. Aids with arc-flash safety regulations Flexible reset Reset can be done through pushbutton on relay or remotely with optional 777-MRSW or OL-Reset remote reset kit

Applications

  • Conveyor systems
  • HVAC equipment
  • Saws and grinders
  • Fan motors Single-Phase Current & Voltage Monitor

Littelfuse.com/ 77C ©2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/30/2022 Motor and Pump Protection Relays 77C Series 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” 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

Littelfuse.com/ 77C ©2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/30/2022 Motor and Pump Protection Relays 77C Series Accessories RS485MS-2W Communication Module (for limited Modbus capabilities) Required to enable the Modbus communications function on Model 77X-type products. Communication Adapters

  • RS485-RS232–Converter with cable & plug
  • RS485-USB–Converter with cable & plug
  • RS232-USB–Converter Specifications match industry standard. RM1000 Remote Monitor The RM1000/777 motor management system combines unsurpassed electronic motor protection and critical, user-friendly, motor monitoring for up to 16 devices. RM2000 Remote Monitor The RM2000/777 motor management system combines unsurpassed electronic motor protection and critical, user-friendly, motor monitoring with event storage and real-time clock for date and time stamp. Solutions Software: Solutions-M Software features include data logging, real-time data monitoring and fault and event monitoring. 777-MRSW Manual Remote Reset Kit Allows the 777 line of MotorSaver® and PumpSaver® products to be manually reset without opening the panel door. OL-RESET Manual Remote Reset Kit Allows the 777 line of MotorSaver® and PumpSaver® products to be manually reset without opening the panel door.

Ordering Information

77C 100-240 V ac 2-800A (external CTs required above 90A) Provides 480VA @ 240 V ac output SPDT relay contacts 77C-LR 100-240 V ac 1-9A only Provides 480VA @ 240 V ac output SPDT relay contacts 777-HVR-SP 340-480 V ac 2-800A (external CTs required above 90A) Provides 470VA @ 600 V ac output SPDT relay contacts. For systems with no control power transformer Dimensions Inches (mm) 3.100 [78.74] 3.850 [97.79] 3.600 [91.44] 2.280 [57.91] 3.050 [77.47] 1.200 [30.48] 3.850 [97.79] 3.600 [91.44] 2.650 [67.31] D. 0.650 [16.51] 0.200 [5.08] OPTIONAL LOOP HOLES MAIN CONDUCTORPASS HOLESA B C inches [millimeters] 4.700 [119.38] 5.050 [128.27] 3.100 [78.74] 3.850 [97.79] 3.600 [91.44] 2.280 [57.91] 3.050 [77.47] 1.200 [30.48] 3.850 [97.79] 3.600 [91.44] 2.650 [67.31] D. 0.650 [16.51] 0.200 [5.08] OPTIONAL LOOP HOLES MAIN CONDUCTORPASS HOLESA B C inches [millimeters] 4.700 [119.38] 5.050 [128.27]

Littelfuse.com/ 77C ©2022 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/30/2022 Motor and Pump Protection Relays 77C Series Disclaimer Notice – Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH MOTOR CONTROL TYPICAL WIRING DIAGRAM FOR MODEL 77C WITH EXTERNAL CT A B C LITTELFUSE RECOMMENDS USING CTs THAT HAVE TERMINALS TO AID CONVENIENCE WHEN INSTALLING CTs. NOTE: PHASES A & C ARE INACTIVE. USE PHASE B FOR ALL ACTIVE CURRENT MEASUREMENTS. CT SECONDARY MUST MAKE FIVE PASSES THROUGH THE PHASE B CONDUCTOR WINDOW. Simplified Wiring Diagram