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77C

更新时间: 2024-11-06 14:56:27
品牌 Logo 应用领域
力特 - LITTELFUSE /
页数 文件大小 规格书
4页 393K
描述
The 77C single-phase relay provides motor protection with input voltage from 100–240 V ac and motor full load ampere range as follows: 2–25 A (looped conductors required); 26–90 A (direct); 91–800 A (external CTs required).

77C 数据手册

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Motor and Pump Protection Relays  
77C Series  
Single-Phase Current & Voltage Monitor  
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  
Visual indication for programming, viewing real-time voltage or  
current, and last fault code  
Built-in display  
Programmable voltage and current settings  
3 selectable restart options  
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  
3 programmable restart delay timers  
Remote display compatibility  
Flexible reset  
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  
Applications  
• Conveyor systems  
• HVAC equipment  
• Saws and grinders  
• Fan motors  
Littelfuse.com/77C  
©2022 Littelfuse, Inc.  
Specifications are subject to change without notice.  
1 of 4  
Revised: 09/30/2022  

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