Correct Answer - Option 2 : 2.0
Latching Current: It is the minimum anode current required to maintain the Thyristor in the ON state immediately after a Thyristor has been turned on and the gate signal has been removed.
Holding Current: It is the minimum anode current to maintain the Thyristor in the on-state.
- Latching current is always greater than holding current.
- Latching current and holding current terms have their significance in making a Thyristor ON and OFF respectively.
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Thyristor goes to on state when Thyristor current is more than latching current.
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Once Thyristor gets ON then there is no meaning of latching current.
- For 20A Thyristor we have to use BT152 and the ratio of latching current to holding current in BT152 is in the range of 2.
