@T-486 Ashepoo , you bring up a good point. I read the first sentence of the original post and assumed that he was wiring the panels in a string that would put out 60v at 10 amps. The rapid shutdown requirements from NEC 2017 and 2020 require that the voltage outside the 1 foot boundary be reduced to less than 30 volts within 30 seconds of tripping the rapid shutdown.
If the panel output voltage is kept under 30 volts at all times, then there should be no need for rapid shutdown.
I guess I'm unclear on how
@Colemoney intends to wire the panels if he has three 200watt 12volt panels. In series, as I interpret it, he would need rapid shutdown because the voltage would be above 30 volts. You also have to consider that this applies to open circuit voltage, not just normal operating voltage.