Phase 8: Protection Devices & Switchgear

This phase contains 4 sections and 44 checklist topics. Use the interactive phase page to track your own learning progress.

General topics

  • Fuse
  • MCB
  • MCCB
  • RCCB/RCD
  • RCBO
  • SPD
  • Isolator
  • Motor protection circuit breaker
  • And 8 more checklist topics

OLR in detail

  • Thermal overload
  • Electronic overload
  • Magnetic overload awareness
  • 95-96 NC trip contact
  • 97-98 NO trip contact
  • Current setting
  • Reset
  • Manual reset
  • And 9 more checklist topics

Switchgear

  • Busbar
  • Terminal block
  • Distribution board
  • Cable protection
  • Earthing
  • Bus duct basic

Practical Field Additions

  • Difference between protective relay and circuit breaker
  • Protection relay trip signal to circuit breaker
  • Basic time-current discrimination/selectivity
  • MCCB versus ACB in LV distribution
  • CT/PT signal monitoring and safe secondary-circuit awareness

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