• Self-powered by built-in a chargeable Li-ion battery.
  • Split-core current transformer (CT) for easy installation.
  • Energy harvest from the CT induced electricity.
  • Uses 433 MHz radio frequency for communication.
  • 16 RF Channels and 4 Group ID, consist of maximum 64 RF sub-networks.
  • Supports maximum 200A CT.
  • Offers wall-mount mechanism and magnet for installation.


The iWSN series sensing module is a self-powered module for AC current, digital input and temperature measurement. It can harvest the demand electricity from CT induced current so that there is no necessary to supply the power line for power supply. By means of sub-1G RF communication interface, iWSN series can approach to the real wireless deployment. The diversified IO interface, such as split-core CT, Rogowski coil, NTC thermistor and dry contact DI, provides users more choices for various applications. Considering the maintenance and installation, the iWSN sensing module uses the DIP switch and rotary switch for configuration. Through the flexibility of the expansion interface and good price performance, the iWSN sensing module can be widely used in the application of saving power, big data analysis, and predict maintenance.



 EMS Protection
 EFT (IEC 61000-4-4) +/- 500 V
 ESD (IEC 61000-4-2) +/- 4 kV Contact


 LED Indicators
 Status 1 x Power
1 x STA


 Temperature Measurement
 Channels 1
 Range 0 °C ~ +80 °C
 Accuracy ±2 °C
 Installation Wall-mount or magnet adsorption


 Split-core CT Channels 2
 Split-core CT Type Φ24mm (200A); 8 m wire
 Input Voltage Maximum 500VAC, 50/60 Hz
 Accuracy ±3% or ±0.3A


 Channels 0 ~ 15 configured by DIP switch
 Group ID 0 ~ 3 configured by DIP switch
 Radio Frequency 433.1000 ~ 434.6000 MHz
 Transmission Power 9±1dBm (PA Off) / 18±1dBm (PA On)
 Transmission Distance (LoS) 100 m
 Node ID 1 ~ 31 configured by DIP switch
 Working Duty 1 sec, 10 sec, 30 sec and 60 sec configured by DIP switch


 Type 0 dBi Omni directional PCB antenna


 Digital Input
 Channels 1
 Type Dry contact only


 Consumption 1-sec Tx Duty: 11 A
10-sec Tx Duty: 3 A
30-sec Tx Duty: 3 A
60-sec Tx Duty: 3A
 Battery Li-ion battery (compliant with UL1642) charged by CT induced current


 Dimensions (mm) 94 x 152 x 21 (W x L x H)
 Installation Wall-mount or magnet adsorption


 Operating Temperature 0 °C ~ +45 °C
 Storage Temperature -20 °C ~ +50 °C
 Humidity 10 ~ 90% RH, Non-condensing



CA-TM-M100-L050P CA-TM-M200-L050P CA-TM-P100-L020P
CA-TM-M100-L050P CA-TM-M200-L050P CA-TM-P100-L020P


iWSN-121A-240-ME     CR  iWSN Current Sensing Module with 2-ch CT Input, 1-ch Thermistor Input and 1-ch DI (RoHS) (Asia Only) (Included 200A CT x2) 1