🔍 Key Concepts

• High-voltage shipboard switchgear construction and where it’s installed (e.g., main generators, propulsion feeders) • Differences in arc-quenching medium between air, oil, gas (like SF6), and vacuum circuit breakers • Why modern shipboard HV systems favor low maintenance and high safety designs

💭 Think About

• Think about which type of breaker is commonly paired with SF6 in modern high-voltage switchgear, especially on newer vessels and offshore units. • Ask yourself which medium (air, gas, vacuum, oil) is best at interrupting large fault currents in a compact, sealed unit with minimal risk of fire or contamination. • Consider which of these breaker types is most associated with older, bulky, high‑maintenance gear and which is associated with modern compact HV practice.

✅ Before You Answer

• Verify which breaker type is specifically designed to interrupt the arc in a sealed environment with almost no gas or liquid to maintain. • Eliminate any option that is typically used for low or medium voltage distribution panels rather than high-voltage shipboard switchboards. • Be sure the option you pick is known in industry texts as a modern companion technology to SF6 for high-voltage switchgear.