What essential information must be stamped on a fusible plug?

The fusible plug is a critical safety component in various refrigeration and air conditioning systems, designed to prevent overpressure situations. When the temperature rises to a certain point, it melts, allowing the refrigerant to escape rather than causing a dangerous increase in pressure.

The correct information that must be stamped on a fusible plug is the melting point of the alloy. This information is vital because it indicates the temperature at which the plug will fail and release the refrigerant, thereby ensuring the system operates safely under designed conditions. Knowing the melting point helps technicians and engineers determine if the plug is suitable for the specific operating environment, ensuring that the system remains within safe operating limits.

While details such as the maximum operational pressure, the manufacturer's name and address, and the type of refrigerant used are important for the overall safety and legal compliance of refrigeration systems, they do not pertain directly to the immediate function of the fusible plug itself. Hence, the melting point information is of utmost importance for its safety and operational effectiveness.