The holding current of an SCR (Silicon Controlled Rectifier) is the minimum current required to maintain the SCR in the ON state after it has been triggered into conduction. Here are the details:

1. Definition:
- The holding current is the threshold current below which the SCR turns off and returns to the OFF state.
- It ensures that the SCR remains conducting even after the gate signal is removed.

2. Behavior:
- Once the SCR is turned on (triggered), it continues to conduct as long as the current through it remains above the holding current.
- If the current drops below this threshold, the SCR turns off spontaneously.

3. Importance:
- The holding current prevents unintentional turn-off due to small fluctuations in current.
- It ensures that the SCR remains latched in the ON state until intentionally turned off.

4. Application:
- SCRs are commonly used in motor control, lighting, and power regulation.
- The holding current ensures stable operation in these applications.

In summary, the holding current is a critical parameter for SCR behavior, allowing it to remain conducting until explicitly turned off[1][1][1].

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