The data plate says the max over current protection is 30 amps but there is a + sign in front of it. " Maximum Over current Protection Amps + :30" Does this mean anything more than 30 amps is acceptable? There is nothing in front of the Minimal Circuit Amps. The breaker was 40 amps.
At best the + sign is a misprint on the nameplate. As Robin stated 30 amps is the maximum if it’s providing protection for the unit.