The term described by a voltage rating such as 240V or 480V indicates what about the circuit breaker?

• A. Straight voltage rating
• B. Rounded voltage rating
• C. Adjusted voltage rating
• D. Matched voltage rating

Answer: (A)

Voltage rating on a circuit breaker is the maximum voltage the device is designed to interrupt safely. A value like 240V or 480V specifies the highest system voltage for which the breaker can be used without risking insulation breakdown or failure to interrupt a fault. It’s a fixed specification from the manufacturer, not something you adjust or round. That’s why this describes a straight, or direct, voltage rating—the maximum voltage the breaker is rated for. Use of a breaker on a higher voltage than its rating can compromise safety and performance.