Wait a minute... You have a load drawing over three amps and it was protected by a 2 amp breaker that didn't open at 50% overcurrent? You have a supply problem as well. I would chuck the breaker immediately for not doing its job. Looks OK on the VA ratings (if you didn't change the voltages of the primary side, remember as voltage drops current increases for a given load) IE if supply (primary) is 440vac @ 10 amps and you drop the primary to 220vac your current demand will jump to @ 20 amps to do the SAME job. This means you have to also do some calculations on the transformer and the load the transformer is supplying IF you dropped the supply voltage and went with a different wiring configuration on your motor and transformer design voltages (a 440vac transformer/motor to operate on a 220vac supply that originally was designed/wired to a 1.5amp load @ 440vac). A very quick guestimation (given the numbers posted if I am reading this correctly) would be originally a 440vac @ 1.5amp demand increased to @ 3amps same circuit, 2 amp breaker didn't trip, replacement went to 220vac same load (higher demand of 3 amp originally) would now be @ 6 amps. New transformer minimum (without 10, 15, or any other % increase safety factor) must handle this high current and of course the motor must be rated this higher current demand as a minimum. Now, the final problem that MUST be addressed. What size wiring is supplying all this upgrade and is it rated for the added current including the distance (wire length) to the end load? Its not as easy to just replace parts, a little more must be done or you run a risk of hurting someone or burning something else up.