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Numerical Single Function Relays : Genesis->
Numerical Directional Overcurrent Protection Relay Type : MIT 121,131


MIT121/131 is micro-controller based numerical true RMS single pole directional over-current protection with voltage polarization, and the relay will operate depending on the direction of fault current and relay setting.

Versions: MIT 121 - Single pole directional over-current protection MIT 131 - Single pole directional over-current protection with DC transient free high set


  • Distribution Feeders
  • Transmission Lines
  • Solidly or resistance grounded systems
Standard Features
Numerical, true RMS measurementBoth 1A & 5A CT inputs in one relay
Wide range for current & time settingsBoth DC & AC auxiliary supply available
Drawout modular case (150X151mm cutout )Compact design
Non-volatile memory for trip indicationSelf-monitoring facility
7 segment LED displayStatus indication LEDs
Sealable front cover to prevent unauthorised accessDirectional phase & ground fault with voltage polarisation (67 P, 67 N)
6 output contacts
MIT 121-131.pdf

Technical Manual
MIT121-131 Manual.pdf

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