SCBA stands for

• A. Self-Contained Breathing Apparatus
• B. Supplied Air Respirator
• C. Self-Contained Breathing Appliance
• D. Supplied Air Breathing Apparatus

Answer: (A)

SCBA stands for a breathing device that carries its own air supply, allowing the wearer to breathe independently of the surrounding environment. This self-contained feature is what sets it apart: the air is stored in onboard cylinders and delivered through a regulator, so you can operate in smoke, toxic fumes, or oxygen-deficient atmospheres without relying on the ambient air or an external hose. That is why this term is the standard and widely used designation in firefighting and hazardous-work safety.

The other phrasings describe respirators that rely on air supplied from outside sources or use nonstandard wording. They describe different concepts (like supplied-air systems) rather than a truly self-contained unit, which is the essence of an SCBA.