Manufacturer of Low and Medium Voltage Switchgear

Product description

KC800 motor protection measurement and control device (from now on referred to as the measurement and control device) is a new generation of full-featured comprehensive measurement and control device developed by our company on the basis of years of experience in the development and production of motor protection products and comprehensive research on domestic and foreign products, user needs and low-voltage drawer cabinets. The measurement and control device has an advanced field bus, is based on microprocessor technology, and adopts a modular structure; the microprocessor performs motor monitoring and control functions and cooperates with contactors, soft starters, and molded case circuit breakers to form low-voltage AC motors and low-voltage Line Loop provides a complete set of solutions integrating control, protection, monitoring, and bus communication.
Replaced the thermal relay, thermal protector, leakage protector, and Undervoltage protector, canceled the time relay, intermediate relay, auxiliary relay, current transformer, instrument, control and selection switch, indicator light, programmable controller, and transmitter It greatly simplifies the difficulty of system wiring; avoids production accidents caused by motor overload, stalled rotor, phase failure, unbalanced three-phase current, overvoltage and undervoltage, and leakage; it is an intelligent MCC ideal choice.
This device is suitable for AC asynchronous motors with AC 50HZ, rated voltage AC380V/660V, and current 800A. It is widely used in electric power, petrochemical, light industry, coal, paper, steel, metallurgy, textile, and other industries.

The product complies with the relevant requirements of the following standards:
  • GB/T 14048.1-2000
  • GB/T 14048.4-2003 IEC60947-4-2: 2000
  • GB/T 1736-2007
  • GB14048.5-2001
  • GB/T 14598.13-2008(IEC 60255-22-1: 2007)
  • GB/T 14598.14-1998(IEC 60255-22-2: 1996)
  • GB/T 14598.9-2002(IEC 60255-22-3: 2000)
  • GB/T 14598.10-2007(IEC 60255-22-4: 2002)
  • GB/T 14598.18-2007(IEC 60255-22-5: 2002)
  • GB/T 14598.17-2005(IEC 50255-22-6: 2001)
  • GB/T 14598.16-2002(IEC 60255-25: 2000)
  • GB/T 14598.16-2002(IEC 60255-25: 2000)
  • General rules for low-voltage switchgear and control gear
  • Low-voltage switchgear and control gear Low-voltage
  • Electromechanical contactors and motor starters
  • Low Voltage Motor Protector
  • Low-voltage switchgear and control gear Part 5-1 Control circuit appliances and switching elements – Electromechanical control circuit appliances
  • Shock wave immunity test
  • Electrostatic Discharge Immunity Test
  • Radio Frequency Electromagnetic Field Radiation Immunity Test
  • Electrical fast transient burst immunity test
  • Surge Immunity Test
  • Conducted disturbance immunity test induced by radio frequency field
  • Conducted emission limit inspection
  • Radiated emission limit inspection

Main Feature

  • Easy to use, easy to operate, Chinese LCD interface, all electrical parameter information, and settings can be read and changed through the function keys on the panel
  • The functions are highly integrated, integrating multiple functions such as protection, measurement, monitoring, control, and communication.
  • International universal input power supply module, compatible with 85~265V AC or DC working power supply, reducing the requirements for working power supply.
  • “tE time protection” complies with the thermal overload protection standard GB3636.3-2000 for increased safety explosion-proof motors
  • The overload “time-current characteristic” complies with the GB/T 14048.4-2003 standard, and more tripping levels are added to meet the requirements for heavy-duty starting.
  • Temperature protection: more direct monitoring of the heating of the motor, in line with the standard GB/T 14048.X-200X
  • With a high-performance mixed-signal microprocessor as the core, it has high-speed computing and real-time signal processing capabilities, and can quickly complete the protection algorithm; the bus of the microprocessor does not go out of the chip, and the reliability and anti-interference ability of the system are greatly improved, and the reliability is enhanced; Using AC sampling, its real-time and accuracy are much higher than other methods
  • Support Modbus protocol and Profibus–DP protocol, can be directly connected to the original DCS system, and the highest speed can reach 12M.
  • The product has been carefully designed and strictly tested for electromagnetic compatibility in terms of shock resistance and anti-interference to ensure the safe operation of the device and anti-misoperation.
  • High-speed acquisition of the access device’s current and voltage input signal data, with high measurement accuracy. The measurement content includes phase current, phase voltage, line voltage, frequency, active power, reactive power, power factor, integral and pulse watt-hour, etc. The measurement current range is wide, and the cost of the primary transformer can be omitted; the measurement accuracy of various electrical and non-electrical signals can be adjusted through the channel correction coefficient, and there is no need to adjust the hardware circuit.
  • There are up to 96 event records, which can be uploaded or viewed locally, providing a strong basis for fault diagnosis and accident analysis
  • The “Power-on self-start” function, after a short-term power failure of the main circuit or power switch, can realize a time-sharing sequential start according to the set parameters
  • It has perfect self-inspection ability, including memory, export, communication port, etc., and it can automatically warn if it finds that the device is abnormal
  • Equipped with protection logic and control logic programmable function
  • Adopt frequency tracking technology to accurately sample frequency conversion AC circuit
  • The transmitter has powerful functions: built-in 4~20mA analog output, can choose a variety of power (current, voltage, power, electric energy), and the range is adjustable.

Selection instructions

KC800-2 rated current selection table

Primary current specification(A)26.32563100200300
Applicable current range(A)0.5~21.5~6.35.0~2520~6320~10080~200150~400
Primary current specification(A)200/5300/5400/5500/5600/5800/5
Applicable current range(A)80~200150~300200~400250~500300~600400~800

KC800-1 current selection table

Specificationcurrent rangeMotor PowerRemark:
1. When selecting the protector specification, it must be determined according to the power of the motor. (The motor power in the selection table is based on AC380V)
2. The voltage specifications are AC220V and AC380V, depending on the secondary circuit voltage of the control motor
3. For protectors with specifications of 300A, 400A, 500A, 600A, and 800A, three current transformers with a transformation ratio of 5A must be installed
4. The installation of three current transformers with a transformation ratio of 1A must be specified when ordering

Functional Overview

Function configuration
KC800-2 comprehensive seriesKC800-1 economical series
Overcurrent protection during startup 
Too long boot time protection
Stall protection
Phase current unbalance
(phase loss, phase failure) protection
light load protection 
Short circuit protection
overcurrent protection
thermal overload protection 
tE time protection 
undervoltage protection
Leakage (earth fault)
zero sequence protection
auto restart
overvoltage protection
low frequency protection 
Fuse monitoring 
Trip circuit monitoring 
communication functionMODBUS-RTU protocol 
Switch input2DI, function programmable
(built-in power supply)
switch output2DO, function programmable 
Analog outputOne 4~20mA signal output
Measurement functionthree-phase current
 three-phase voltage 
 Current unbalance rate 
 Active power P 
 Reactive power Q 
 Power factor COS 
 leakage current 
 electrical energy 
Fixed value settingQuery and setting of various protection values
accident detailsQuery fault/alarm information in real time 
Start parameter settingInquiry and adjustment of parameters
such as control authority and startup
System parameter settingAddress, baud rate, motor rating and
other parameters query and setting

Note:                                                     □ means standard configuration                   △ means optional configuration

Measurement and management functions

  • Measure voltage Ua, Ub, Uc, internally calculate active energy and reactive energy, and also connect to an external energy pulse
  • Measure three-phase current Ia, Ib, Ic, and zero-sequence current I0 and negative-sequence current, 1 channel 4-20mA output, any measured value can be transmitted and output
  • Measure the active power P, reactive power Q, and power factor, and record the total running time of the motor and the maximum current during the last successful start
  • Measuring frequency f, the minimum time interval between two starts, and restart control function allowed
    current unbalance
  • Circuit breaker opening and closing, knife switch position, fuse, and other switching signals
  • Protection action information; record volume up to 96, circular record display
    Four remote functions such as telemetry, remote signaling, remote control, and remote pulse
    Monitoring and control of unit operating status
    Remote custom management, time synchronization, signal reset and other system management functions
    Support Modbus protocol and Profibus–DP protocol


  • Remote control output, user panel control output;
  • Input and output adopt programmable logic control, easy-to-realize control chain, and interlock;
  • Large Chinese character liquid crystal is used to display various measurement data, switch input status, relay output status, communication status, clock, SOE information, etc. All kinds of information are clear at a glance.

Main technical parameters, working conditions

Technical Parameters

  • Motor-rated working voltage: AC380V、AC660V
  • Control power: 220VAC,  50Hz  15VA/15W
  • Rated current: 0.5~800A
  • Rated operating frequency: 50Hz
  • Insulation resistance: 100MΩ/500V
  • Protection level: controller body IP20; display module IP45
  • Voltage: AC/DC85-265V
  • Frequency:  38Hz-70Hz
  • Power consumption: ≤1.5W when working normally, ≤2.0W when protection starts

Working Conditions

  • Three-phase piercing adaptation circuit: AC380V、AC660V
  • Working power supply voltage: AC220V
  • Altitude below: 2500M
  • Operating temperature:  -10℃~+55℃
  • Storage temperature: -25℃~+70℃
  • Relative humidity: ≤90%
  • Atmospheric conditions: There is no medium that can cause explosion hazards, and there is no conductive dust that can corrode metals and damage insulation performance.
    Install in a place without strong shock vibration and rain and snow.
    Install it in a place without strong magnetic interference, avoid installing it together with soft starters and frequency converters, and try to lengthen the installation distance.
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