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If the unit doesn't trip the breaker until after 10 minutes, most likely the breaker is just weak and tripping after it's had power pulling through it for awhile heating up the breaker. I'm not sure how new your breaker is, but if it hasn't been replaced since this issue started, replace it. Other than that if you're clamping one of the wires and it's never drawing more than 30 amps but the breaker trips, you just have a bad wire going through the house or something along those lines because a breaker should never trip unless the dryer draws more than 30 amps and if the dryer was doing that it would trip right away.
one of the power wires to the dryer and you need an amp clamp to test the wires. I'm not sure how you stated that you tested with a multimeter if you don't have an amp clamp... there is no valid test other than clamping a wire to know the amp draw since amperage is what trips a breaker.
OK well unfortunately that is never going to help with an intermittent problem. Unless it's constant and occurring at all times then you can't get any useful information testing it that way. You'd need an amp clamp to clamp one of the wires coming from the dryer to see if it's drawing over 30 amps when the breaker trips or not. If it's not, then you have a weak breaker.