Littelfuse SymCom 77C Series MotorSaver.

Littelfuse SymCom 77C MotorSaver is a fully-programmable electronic overload relay designed to monitor single-phase systems. This single-phase relay provides motor protection with input voltage from 100–240VAC and motor full load ampere range as follows: 2–25 A (looped conductors required); 26–90 A (direct); 91–800 A (external CTs required). It can be used as a stand-alone product or the communication port can be used to form a network and monitor the motors from a laptop or desktop computer, or other control system. Applications include conveyor systems, HVAC equipment, pumps, saws, grinders, and other single-phase electric motors.

The Model 77C includes a built-in current transformer (CT) which will handle applications from 2-90 Amps. An external current transformer can be implemented to handle applications up to 800 Amps. The Model 77C-LR is a low amperage range model used with motors drawing 1-9 full load amps. The following 14 parameters can be viewed from the 3-digit alphanumeric display or from a network computer: low voltage setpoint, high voltage setpoint, CT size/loops setting, over current trip point, undercurrent trip point, trip class (5, 10, 20, 25, 30, or linear), rapid-cycle timer (RD1), overload restart delay (RD2), under load restart delay (RD3), number of restarts after an overload (manual or automatic), RS-485 address, number of restarts after an under load fault, under load trip delay, and linear over current trip delay. Both the voltage and the line current can also be viewed while the motor is running.

The Model 77C can be used with an optional RS-485 module (P/N: RS485MS-2W) allowing up to 99 Model 77C, Model 777, Model 601,or RM-2000 units to be linked together using Modbus. From the computer, an operator can control the motor, view the operating parameters, or log information. SymCom’s Solutions software and RS-485 module are sold separately.

Protects Single-Phase Motors From:
• Overload
• Underload
• Jams
• Low Voltage
• High Voltage
• Rapid Cycling

Other Features:
• Automatic or manual reset, remote reset
• Tamper guard
• Alphanumeric LED diagnostic display
• Last fault memory
• Compact design saves precious panel space
• Digital programmability permits precise customization
• 15 parameters can be programmed for maximum protection
• Voltage, current, last 4 faults, kWh usage, and power factor are recordable with communications package

Disclaimer Notice: Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.