"We are not in the business of surprising people, we are in the business of doing what we think needs to be done to achieve our objectives," he added.
"So I don't think you should interpret this as some sort of change in philosophy, but a correction, and we will try and keep communicating as much as we possibly can. World interest rates are lower and we are behind with all this uncertainty."
When asked how close the policy committee's call was, he noted the word "debated" was used in the summary of the meeting and that the decision was reached by consensus.
"You can't be scared of surprising the market," he said. "It's not something we want to make a pattern of, but you can't let it hinder us from what we need to do. We can't just deliver what the market expects."
Yesterday, governor Adrian Orr downplayed concerns depositors would be hard hit by the rate cut and told Parliament's finance and expenditure select committee that investors need to put their money to work better.
ANZ had said it was concerned about the impact of lower rates on savers and it was reviewing deposit rates, while Westpac had warned the move may stoke house price inflation.