Mini RTU – for secondary substation automation

Mini RTU by ELSETA is the most versatile modular solution for secondary substation automation for distribution network operators, utility companies, and factories. Designed for a broad range of applications, ELSETA’s Mini RTU originates from a WCCLite combination with optional I/O modules.

More information about all features you can find here.

Mini RTU by ELSETA collates up to 3000 signals (together with I/O modules) for direct routing to SCADA systems over IEC60870-5-101, IEC60870-5-104, DNP3 or Modbus protocol. Measuring just 12 x 2 x 10 cm, this compact RTU fits into smaller enclosures and saves DIN rail space, reducing its cost of installation. Mini RTU by ELSETA communicates with the control center through an integrated 2G/3G/4G(LTE) modem. It also has LAN and WiFi interfaces for easier configuration and access.

The choice of different input/output modules gives you freedom for system extension. The core WCC Lite unit communicates with I/O modules through Modbus (RTU) or IEC60870-5-103 protocol. Adding and configuring each I/O module is almost Plug’n’Play.

Supported protocols:

  • Modbus master/slave (RTU/TCP)
  • M-bus master (Serial/TCP)
  • DLMS/COSEM (Serial/TCP)
  • IEC62056-21 (Serial)
  • IEC62056-31 (Serial)
  • IEC60870-5-101 master/slave
  • IEC60870-5-103 master
  • IEC60870-5-104 master/slave
  • DNP3 level 3+ master/slave (Serial/TCP)
  • IEC61850 client (optional)
  • Transparent tunnel from TCP to Serial
  • MQTT
  • Restful API

Mini RTU is an ideal solution for distribution substations and MV switchgear:

  • Operating temperature ranges from -40 to +85 °C, enabling Mini RTU to work in the roughest weather conditions
  • One of the highest cybersecurity levels in the market
  • Integrated communications: 2G/3G/4G(LTE), WiFi or LAN interfaces onboard, with optional dual SIM modems for the highest reliability
  • Easily scalable by combining individual I/O modules via Plug’n’Play
  • Long product life-cycle and high investment security


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  • 1xRS485/232; 1xRS485; 2xEthernet
  • WIFI, 2G/3G/4G(LTE) integrated communication
  • Optional: 2 SIM card modem
  • Internal memory: SD card
  • RTC clock and NTP server/client
  • Hardware Watchdog
  • Alarm management
  • User management
  • Cyber security according to industry standards
  • Syslog event to a remote server
  • SOE event management
  • Web-based configuration
  • Detailed information on connected devices
  • Network traffic monitoring and filtering
  • Plug’n’Play configuration for I/O modules
  • Remote Authentication Dial-In User Service (RADIUS)


  • 16 digital inputs (IOMod 16DI)
  • 8 digital inputs/8 digital open collector outputs (IOMod 8DIDO)
  • Configurable input signal polarity and inversion
  • Galvanically isolated inputs
  • Configuration through USB
  • Drag’n’Drop firmware upgrade
  • Modbus over RS485
  • IEC60870-5-103 over RS485
  • LED indication
  • DIN rail mount


  • 8 analog inputs
  • Data measurement in 16-bit resolution
  • Data scaling and casting
  • Configuration through USB
  • Drag’n’Drop firmware upgrade
  • Modbus over RS485
  • IEC60870-5-103 over RS485
  • Software selectable termination resistor on RS485
  • LED indication
  • DIN rail mount


  • 4 analog inputs
  • 4 temperature sensors
  • Selectable PT100 or PT1000 temperature RTD sensor (2, 3, or 4 wires) for all channels
  • Temperature measurement of 0.5°C accuracy
  • Temperature sensing range: from -200 to 800 °C
  • Configuration through USB
  • Drag’n’Drop firmware upgrade
  • Modbus over RS485
  • IEC60870-5-103 over RS485
  • LED indication
  • DIN rail mount