The gate trigger voltage (V_GT) of a Silicon Controlled Rectifier (SCR) is the minimum voltage that must be applied between the gate and cathode terminals to trigger the SCR into conduction. When the SCR is in conducting mode, current flows from the anode to the cathode. The gate trigger voltage is a crucial parameter as it ensures that the gate drive circuit can provide sufficient voltage to reliably turn on the SCR under all operating conditions. Typical values of gate trigger voltage range from 0.6 V to 2.5 V, depending on the specific SCR device and its operating conditions.

The gate trigger voltage is a threshold voltage, below which the SCR remains off even if the anode-to-cathode voltage is present. This voltage decreases with an increase in temperature. Its value is usually provided in the datasheet of SCR and is used in designing circuits that involve controlled rectification, phase control, or switching applications.

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