What principle allows using a higher voltage circuit breaker on a lower voltage application?

The principle that allows the use of a higher voltage circuit breaker on a lower voltage application is the half voltage rule. This rule states that a circuit breaker rated for a higher voltage can be effectively used in lower voltage environments, typically up to half of its rated voltage. This is because the insulation and structural integrity of the circuit breaker are designed to handle higher voltages, allowing it to safely interrupt the lower-voltage current without risk of failure or insufficient operation.

Utilizing a higher voltage circuit breaker in a lower voltage application can also provide benefits such as increased durability and a greater ability to withstand surges, making it a practical choice in many situations, as long as the operational current is within the range of the breaker's current rating.

The other options do not aptly describe this particular principle. The voltage rating law typically concerns regulatory standards, the compatibility principle relates to the interactions between components in a system, and safety voltage regulation pertains to safety standards and practices rather than the specific usage of circuit breakers in varying voltage applications.