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Digipro 1000 capacitor info

Hello, I'm new to the forum and I have a 1000 SCH PCB digipro board that has a capacitor (I think) in the current input that puts Z1 K175 and I do not know exactly what it is and what its value is, the symbol is a capacitor inside a circle.
Could you tell me what it is and its value?
The scheme is here: https://elektrotanya.com/digipro...
Thankful in advance.