Earth Leakage Protection Relay

Residual current devices are used to detect potentially dangerous earth fault currents before damage is caused. An undetected fault current may lead to cables overheating, which could start a fire. If high fault currents are involved, hazardous voltages may also appear on earthed equipment, putting lives at risk.

The 373-ELR earth leakage protection relay allows the fault current to be continuously monitored and compared with the user selectable leakage level. Should the leakage exceed this level, the relay will trip to indicate a fault condition. With a very fast response time of under 40ms, the supply can be disconnected before serious damage can occur. T

his product is intended to provide a high degree of earth leakage protection and monitoring for any electrical equipment, specifically motors and their control gear, generator sets and transformers.


  • Precision digital settings
  • LED bar graph display
  • 10 selectable trip levels – 30mA to 10A
  • 16 selectable time delay – 0ms to 10 seconds
  • Less than 40ms response time
  • 0-1mA analogue output
  • 8 amp 250V rated relay contacts
  • User selectable energise or de-energise link
  • Double-pole change over relay
  • Single-pole pre-alarm option


  • DIN-rail 43880 enclosure
  • Switched mode supply accepts a wide range of auxiliary voltages
  • Detects residual current flow
  • Isolation of faulty circuits
  • Insulation monitoring
  • Advanced warning of faults
  • Complementary range of core balanced CTs
  • Protection of expensive power assets


  • Switchgear
  • Distribution systems
  • Generator sets
  • Control panels
  • Building management
  • Utility power monitoring
  • Process control
  • Motor protection
  • Transformer protection

Protector-373-ELR(SPECS CLICK)

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