MOP is the maximum allowable size for the circuit breaker or fuse protecting your HVAC equipment. This value is designed to protect the internal components of the system from massive electrical surges or short circuits. If you install a breaker that is larger than the MOP, you risk damaging the inverter boards in your Mitsubishi or OLMO system during a power event. For high-capacity units like our 48000 BTU condensers, ensuring the MOP is strictly followed is a requirement for maintaining your warranty. This specification is clearly listed for all our heat pump condensers in the product manuals. Proper electrical protection is the best way to safeguard your investment in great deals and more.