Features

Protection Function
  • Various protection factor for motor (8 protection factors)
  • Applicable to invertor circuits
  • Instantaneous power failure compensation and restart
  • Digital meter function
Convenience Function
  • Ease of installation
  • Wide current range
  • Function to save fault value and cause
  • Self-diagnosis and sequence monitoring
  • Total operating time and operating time setting
Communication Function
  • Various communication compatibilities (RS485 modbus and 4~20mA output)
Protection Function
  • Various protection factor for motor (8 protection factors)
  • Applicable to invertor circuits
  • Instantaneous power failure compensation and restart
  • Digital meter function
Convenience Function
  • Ease of installation
  • Wide current range
  • Function to save fault value and cause
  • Self-diagnosis and sequence monitoring
  • Total operating time and operating time setting
Communication Function
  • Various communication compatibilities (RS485 modbus and 4~20mA output)

Protection factor

Rating Operating condition Time Remark
Over
current		 Inverse Over 110% setting current 1~60s/1s 600% standard operating time
Definite time Over 105% setting current 1~60s/1s Delay time 1~200s
Phase fault Over 70% current phase unbalance Within 1.5s Phase fault rate = Maximum Phase Current - Minimum Phase Current / Maximum Phase Current ×100%
Phase unbalance Current phase unbalance 30~50% Within 5s
Reverse phase Reverse the current phase Within 0.1s Over 110% minimum ratings
Under current Rating current 30~70% Within 3s
Holding Stall Rating current 150~300% Within 5s Detection after over current setting time
Locked rotor Rating current 200~700% Within 0.5s
Ground fault The current rating 0.1~2.5A setting 0.05~1.0s Ground fault delay operation
Pre-alarm Over 120% setting value Bar-LED blinking
Rating Operating condition Time Remark
Over
current		 Inverse Over 110% setting current 1~60s/1s 600% standard operating time
Definite time Over 105% setting current 1~60s/1s Delay time 1~200s
Phase fault Over 70% current phase unbalance Within 1.5s Phase fault rate = Maximum Phase Current - Minimum Phase Current / Maximum Phase Current ×100%
Phase unbalance Current phase unbalance 30~50% Within 5s
Reverse phase Reverse the current phase Within 0.1s Over 110% minimum ratings
Under current Rating current 30~70% Within 3s
Holding Stall Rating current 150~300% Within 5s Detection after over current setting time
Locked rotor Rating current 200~700% Within 0.5s
Ground fault The current rating 0.1~2.5A setting 0.05~1.0s Ground fault delay operation
Pre-alarm Over 120% setting value Bar-LED blinking

Sequence

Rating Contents
Operating type Direct operation Non-reversible direct operation
Y-▵ operation Y operation time 1~120s/1s
Y-▵ switching time 0.05, 0.1, 0.2s
Forward / Reverse operating Reversible direct operation
Reactor Reactor time 1~120s/1s
Inverter Inverter delayed time ON 1sec/0.1sec
Instantaneous
under voltage
compensation		 Compensation time OFF 1~10s /1s
Re-operation delay time 0~300s /1s
Under voltage detection (Rating control voltage × 65%) ± 10%
Re-operation delay time (Rating control voltage × 75%) ± 10%
Remote control Local LOP(Local Operation Panel)
MCC Motor Control Center
Auto PLC, DDC, DCS auto operation
Remote Modbus/RS-485 communication
Rating Contents
Operating type Direct operation Non-reversible direct operation
Y-▵ operation Y operation time 1~120s/1s
Y-▵ switching time 0.05, 0.1, 0.2s
Forward / Reverse operating Reversible direct operation
Reactor Reactor time 1~120s/1s
Inverter Inverter delayed time ON 1sec/0.1sec
Instantaneous
under voltage
compensation		 Compensation time OFF 1~10s /1s
Re-operation delay time 0~300s /1s
Under voltage detection (Rating control voltage × 65%) ± 10%
Re-operation delay time (Rating control voltage × 75%) ± 10%
Remote control Local LOP(Local Operation Panel)
MCC Motor Control Center
Auto PLC, DDC, DCS auto operation
Remote Modbus/RS-485 communication

Specification

Rating Specification
Model   IMC-IIIa
Operating time Characteristic  Inv/Def time
Current range(A)   0.125~60A(Within 1 model)
Time setting (s) Inverse time  1~60sec/1sec(Class)
Definite time D-Time *  1~200sec/1sec
O-Time *  1~60sec/1sec
Auto re-closing time  1~20min/1min, OFF
Control power Voltage  AC 110V or AC 220V(±15%)
Frequency  50/60Hz
Power consumption  Under 6W
Output contact (7EA) Capacity  5A/250VAC impedance load
Composition Operating contact 3a  Forward/Reverse, Y-Δ, Reactor, Inverter start
Condition contact 3a  Local, Auto indication
Trip contact 1a  Fault output contact
Input contact (8EA) Operating input 5a  Local, Auto, ETC
MC condition input 1a  MC condition monitoring
External trip 1a  Emergency stop
ZCT Ratings  200mA/0.1mA(ZCT)
Specification  ø25, ø40, ø80
Indication 7-Segment  3-Phase current, Trip cause, Settings
LED  Operating, Trip, System fail, Communication status
Self-Diagnostic  System fail LED and err indication
Communication(Option)   Modbus/RS-485 or 4~20mA
Installation   Inside the panel
Separate cable   MCT cable 2m base(4m cable option)
Insulation voltage   AC 2kV(1.5kV) / 1 min
Impulse voltage   Over AC 5kV(3kV), 1.2x50㎲
Insulation resistance   Over DC500V 10MΩ
Power frequency magnetic field   100A/m, 50Hz
Burst disturbance   Common 2.5kV
  Differential 1.0kV
Fast transients disturbance   Input 2kV, Other Input 1kV
Electrostatic Discharge   Air 8kV, Contact 6kV
RFI   30cm near electric wave by
  5W transceiver(230MHz)
EMI   AC power : 0.15~0.50MHz, Standard : 79dB, Average : 66dB
  0.50~30MHz, Standard : 73dB Average : 60dB
Operating temperature   -10 ~ 55℃
Storage temperature   -20 ~ 70℃
Relative humidity   Within 80% RH, no condensation
Standard   IEC 60255, IEC 61000-4, IEC 60068-2, EN 50081-2
Weight   0.6kg(MCT 0.35kg)
Dimension Main unit   148(W) × 100(H) × 74(D) mm
MCT  151(W) × 55(H) × 33(D) mm

* D-Time(Delay time) : It is delay time for IMC-IIIa start during motor start time
* O-time (Operating delay time) : When over current generates more then setting current, that makes it delayed until IMC-IIIa operated.

Rating Specification
Model   IMC-IIIa
Operating time Characteristic  Inv/Def time
Current range(A)   0.125~60A(Within 1 model)
Time setting (s) Inverse time  1~60sec/1sec(Class)
Definite time D-Time *  1~200sec/1sec
O-Time *  1~60sec/1sec
Auto re-closing time  1~20min/1min, OFF
Control power Voltage  AC 110V or AC 220V(±15%)
Frequency  50/60Hz
Power consumption  Under 6W
Output contact (7EA) Capacity  5A/250VAC impedance load
Composition Operating contact 3a  Forward/Reverse, Y-Δ, Reactor, Inverter start
Condition contact 3a  Local, Auto indication
Trip contact 1a  Fault output contact
Input contact (8EA) Operating input 5a  Local, Auto, ETC
MC condition input 1a  MC condition monitoring
External trip 1a  Emergency stop
ZCT Ratings  200mA/0.1mA(ZCT)
Specification  ø25, ø40, ø80
Indication 7-Segment  3-Phase current, Trip cause, Settings
LED  Operating, Trip, System fail, Communication status
Self-Diagnostic  System fail LED and err indication
Communication(Option)   Modbus/RS-485 or 4~20mA
Installation   Inside the panel
Separate cable   MCT cable 2m base(4m cable option)
Insulation voltage   AC 2kV(1.5kV) / 1 min
Impulse voltage   Over AC 5kV(3kV), 1.2x50㎲
Insulation resistance   Over DC500V 10MΩ
Power frequency magnetic field   100A/m, 50Hz
Burst disturbance   Common 2.5kV
  Differential 1.0kV
Fast transients disturbance   Input 2kV, Other Input 1kV
Electrostatic Discharge   Air 8kV, Contact 6kV
RFI   30cm near electric wave by
  5W transceiver(230MHz)
EMI   AC power : 0.15~0.50MHz, Standard : 79dB, Average : 66dB
  0.50~30MHz, Standard : 73dB Average : 60dB
Operating temperature   -10 ~ 55℃
Storage temperature   -20 ~ 70℃
Relative humidity   Within 80% RH, no condensation
Standard   IEC 60255, IEC 61000-4, IEC 60068-2, EN 50081-2
Weight   0.6kg(MCT 0.35kg)
Dimension Main unit   148(W) × 100(H) × 74(D) mm
MCT  151(W) × 55(H) × 33(D) mm

* D-Time(Delay time) : It is delay time for IMC-IIIa start during motor start time
* O-time (Operating delay time) : When over current generates more then setting current, that makes it delayed until IMC-IIIa operated.