But the man, whose name is suppressed, was found guilty of breaching a protection order.

The accused was tried in a judge-only trial in the ACT Supreme Court in November last year on charges of threatening to kill another person, burglary, assault occasioning actual bodily harm and breaching a protection order.

He also faced a charge of using an offensive weapon until Chief Justice Terence Higgins dropped the count mid-trial. He pleaded not guilty to all charges.

The defendant was accused of threatening to kill the woman before assaulting her with a Taser-like weapon, which he had built using an electrical cord.

The complainant said he had used the cord to choke her and his hand to try to suffocate her when the device failed to deliver a shock.

But the accused disputed her version. He said he had gone to the house, despite fears it would breach the court order, because the woman asked him to fix potentially dangerous wiring in a disused bathroom.

The man told the court the complainant arrived while he was working, despite telling him she would be at work on the day, and made him a cup of tea before attacking him.

Chief Justice Higgins, who reserved judgment on the matter at the trial's completion, acquitted the man of the four charges on Friday.

In the published judgment, he wrote the decision to dismiss the charges was the result of reasonable doubt. ''This has been a bizarre and perplexing case,'' he wrote.

''I cannot say with certainty that the injuries arose that way or as the complainant described it.

''There are significant difficulties in the way of being satisfied that her version represents the truth of what happened. It follows that I cannot find a verdict of guilty.''

But he found the man guilty of breaching the order.