I'll do my best to be quick.
If I understand the question correctly, a conviction can be made out.... The test, so to speak, would depend on the particular charge. The elements of that offence have to be proved, depending on what offence the person is charged with. If I understand you correctly, you're asking about the evidentiary standard that applies in a criminal trial, which is proof beyond a reasonable doubt.
Equally, for the provisions under which a protection order may be granted, there may be many of those. The test for that particular order could change, depending on what the requirements of that legislation or specific provision are. That would include the evidentiary standard that applies. The provision that makes the order available would also tend to indicate the level of evidence that's required to prove that.
I could say, at least, that of the protection orders that I'm aware of, that's generally either reasonable and probable grounds or a balance of probabilities, depending on what that particular legislation shows.
If I understand the question, criminal trials operate by the highest evidentiary standard known to criminal law, and protection orders operate by lower standards.