70.42 Line Monitoring Relay

Function and Features

Type 70.42, Line voltage monitoring relay for three-phase networks. Multi-function model, for monitoring three-phase networks (380 … 415 V, with neutral). Monitoring modes: undervoltage, overvoltage, window (overvoltage + undervoltage), phase rotation, phase loss, neutral loss (selectable), voltage asymmetry. Selectable Fault Memory

Features include:

  • Detects phase failure error even in the presence of regenerated voltages
  • Positive safety logic (make output contact opens when the measured value is out of limits)
  • All functions and values ​​can be easily set using the selectors and front regulators
  • “Blade + cross” – both flat blade and cross head screwdrivers can be used to select the function, adjust the trimmer and release the rail clip
  • Clear and immediate identification of the status through colored LEDs
  • 2 changeover contacts 8 A
  • Modular, 35 mm wide
  • 35 mm rail (EN 60715) mounting
  • Cadmium-free contacts


  • Air conditioners
  • Woodprocessing machines
  • Hoists and cranes
  • Escalators
  • Control panels for pumps
  • Forced-air ventilators

Technical Data

Contact Specification
Contact Configuration 2 CO (DPDT)
Rated Current/ Maximum Peak Current (A) 8/15
Rated Voltage / Maximum switching voltage (V AC) 250/400
Supply Specification
Nominal Voltage (V AC) 380…415



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