Hello Muhammad Asif,
Thank you for your reply.
This product can work on 3A for a long time.
Working on large current for a long time, the product will get hot, which is normal.
However, this product is equipped with fan and has intelligent temperature control threshold (55℃/131℉).
When the temperature is higher 55℃/131℉, the fan will be turned on automatically.
Hope this can help you.
Best regards