principal voltage (of a thyristor)

The voltage (potential difference) between the main terminals.

NOTE 1 In the case of unidirectional triode thyristors, the principal voltage is called positive when the anode potential is more positive than the cathode potential and called negative when the anode potential is less positive than the cathode potential. Thus, for these thyristors, "principal voltage" and "anode-cathode voltage" are synonymous.

NOTE 2 In the case of bidirectional thyristors, the principal voltage is called positive when the potential of main terminal 2 is more positive than the potential of main terminal 1.

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