Triggering modes of TRIAC (Triode for alternating current)

The following are the triggering modes of TRIAC (Triode for alternating current).

  • I + mode : The ‘I’ indicates first quadrant operation. The MT2 (main terminal 2) positive with respect to MT1 (main terminal 1). The ‘+’ symbol shows the polarity of gate (G) with respect to MT1 (main terminal 1). In this mode the conduction of current takes place from MT2 to MT1.
  • I mode : The ‘-’ shows the polarity of gate (G) with respect to MT1 (main terminal 1). The conduction of current takes place from MT2 to MT1.
  • III + mode : The ‘III’ indicates the third quadrant operation where MT1 (main terminal 1) is positive with respect to MT2 (main terminal 2). The ‘+’ symbol shows the polarity of gate with respect to MT1 (main terminal 1). The conduction of current takes place from MT1 to MT2.
  • III mode : The ‘-’ symbol shows the polarity of gate (G) with respect to MT1 (main terminal 1). The conduction of current takes place from MT1 to MT.
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