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A triac conducts when

  • A triac conducts when Not triggered in both direction.
  • When a triac is not triggered with a gate signal, it does not conduct current in either direction up to a certain voltage level, which is called the "blocking voltage" or "off-state voltage" of the triac.
  • Once the voltage across the triac exceeds the blocking voltage, the triac may start conducting current in either direction without the need for a gate signal, and this is called "unintentional triggering" or "snap-on".
  • The magnitude of the unintentional current that flows through the triac during this unintentional triggering depends on the load connected to the triac and the magnitude of the voltage.
  • In some cases, the unintentional triggering may not cause any damage to the load, but in other cases, it may cause damage to the load or the triac itself.