What can be found marked on fusible plugs located on a condenser?

Fusible plugs are designed to provide a safety mechanism in systems such as condensers, where temperature control is critical. The correct answer relates specifically to the melting point marked on these plugs.

Fusible plugs are made from materials that will melt at a certain temperature, which indicates their designed operational thresholds. When the temperature exceeds the designated melting point, the plug will fail and relieve pressure or liquid, thereby preventing potential damage or risk of explosion within the condenser system. This feature is pivotal in maintaining system safety and is essential for the proper operation of the equipment, making it important for users to be aware of the specific melting point in order to monitor system integrity and conditions.

The other options, while they may seem relevant in various contexts, do not pertain to fusible plugs. Expiration dates are more typically found on consumable goods rather than on safety components like plugs. Maximum pressure ratings would be more relevant to the overall system design rather than specifically indicated on the plugs themselves. Manufacturer’s information, although often present on many parts, serves more in identification and quality assurance rather than in indicating operational parameters such as melting points.