What specific data is provided on a fusible plug used in condensers?

• A. The operating pressure
• B. The color code
• C. The date of manufacture
• D. The melting point

Answer: (D)

Fusible plugs are heat-activated safety devices in condensers. They’re designed with a material that melts at a specific temperature, so if the condenser overheats, the plug melts and vents to relieve pressure. The data provided on such a plug is the melting point, because that rating tells you the exact temperature at which the plug will activate. This helps ensure the condenser is protected under high-temperature conditions and allows proper selection for the system. Other information like operating pressure, color code, or manufacture date isn’t the specification the plug conveys for its thermal safety function.