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The main difference between non-polarity and polarity of a DC mini circuit breaker is the way that the circuit breaker is designed to handle the direction of the current flow.

A non-polarity DC mini circuit breaker does not have a specific polarity designation, meaning it can handle current flow in either direction, regardless of whether the current is positive or negative. This makes it easier to install and use, as there is no need to worry about the direction of the current flow.

In contrast, a polarity-sensitive DC mini circuit breaker is designed to handle current flow in only one direction, either positive or negative. This type of circuit breaker is typically used in applications where the direction of the current flow is known and needs to be controlled, such as in certain types of battery charging circuits.

Another difference between non-polarity and polarity DC mini circuit breakers is their construction. Non-polarity circuit breakers usually have a simpler design with fewer components, while polarity-sensitive circuit breakers require additional components to ensure that current flows in the correct direction.

Overall, the choice between a non-polarity and polarity-sensitive DC mini circuit breaker depends on the specific application and the requirements for current flow direction control.