On the CCB credit card website, the cash installment application amount is written as follows: it must be an integer multiple of 100 yuan, the minimum is 500 yuan, and the maximum does not exceed the cardholder’s available credit limit (excluding overpayments and Temporary quota) and the cumulative amount does not exceed RMB 50,000.

So according to what they wrote, the maximum cannot exceed 50,000, but if your permanent limit is 20,000, then the maximum cash installment amount you can apply for with this card is 20,000.