________ are filled with compressed gas known as SF₆.

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Multiple Choice

________ are filled with compressed gas known as SF₆.

SF6 gas is used as the insulating and arc-quenching medium in certain circuit breakers. These breakers enclose the contacts in a chamber filled with compressed sulfur hexafluoride, whose very high dielectric strength and arc-quenching capability let the device interrupt large currents efficiently. When the contacts separate, the arc is suppressed because SF6 absorbs energy and captures free electrons, cooling and extinguishing the arc while maintaining insulation in the gap. This combination allows for compact designs that tolerate high voltages. Other types of breakers rely on different media: oil-filled breakers use mineral oil for insulation and arc quenching, vacuum breakers interrupt the arc in a near-void environment, and air breakers rely on air as the insulating medium. None of these use SF6 as the primary interrupting medium.

SF6 gas is used as the insulating and arc-quenching medium in certain circuit breakers. These breakers enclose the contacts in a chamber filled with compressed sulfur hexafluoride, whose very high dielectric strength and arc-quenching capability let the device interrupt large currents efficiently. When the contacts separate, the arc is suppressed because SF6 absorbs energy and captures free electrons, cooling and extinguishing the arc while maintaining insulation in the gap. This combination allows for compact designs that tolerate high voltages.

Other types of breakers rely on different media: oil-filled breakers use mineral oil for insulation and arc quenching, vacuum breakers interrupt the arc in a near-void environment, and air breakers rely on air as the insulating medium. None of these use SF6 as the primary interrupting medium.

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