Circuit breakers shall be marked with a voltage rating indicative of their capability to interrupt fault currents between:

The correct answer indicates that circuit breakers are required to be marked with a voltage rating that reflects their ability to interrupt fault currents in a comprehensive manner that covers both phase-to-phase connections and phase-to-ground conditions.

Understanding this requirement is crucial for ensuring the safety and effectiveness of electrical systems. Circuit breakers are protective devices designed to automatically disconnect a circuit when it detects an overload or a fault condition, such as a short circuit. By being marked with a voltage rating that encompasses all these conditions, it allows electricians, engineers, and technicians to select appropriate breakers based on the specific electrical system they are working with.

This comprehensive marking ensures that the circuit breaker can effectively manage fault currents that may occur in different configurations, promoting both operational integrity and safety. The capability to interrupt fault currents in multiple scenarios ensures that the device can handle possible fault conditions that could harm equipment or pose safety risks.

Options that suggest limiting the voltage rating to only certain conditions would not provide a complete view of the circuit breaker's operational limits, potentially leading to inadequate protection in real-world scenarios. Hence, the broad coverage indicated in the correct answer is essential for reliable performance in a variety of fault conditions.