Find the latching current of an SCR if the value of the holding current is 21 mA.

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UPSSSC JE 16 April 2022 (Electrical) Official Paper
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  1. 10.5 mA
  2. 7 mA
  3. 3 mA
  4. 24 mA

Answer (Detailed Solution Below)

Option 4 : 24 mA
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  • 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.
     

Application:

Given that, holding current = 21 mA

Latching current should be more than 21 mA

From the options, it will be 24 mA
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