What is the setting temperature of a fusible plug?

A fusible plug is a safety device commonly used in fire protection systems, typically made of a metal alloy that melts at a specific temperature. The correct answer indicates that the setting temperature of a fusible plug is 280° F. When the temperature exceeds this threshold, the plug melts, which allows the system to relieve pressure or release water to help extinguish a fire.

Understanding the significance of this temperature helps in ensuring the effectiveness of fire suppression systems. At 280° F, the fusible plug is designed to activate before any significant damage can occur, ensuring a timely response to a thermal outbreak.

The other options do not correctly represent the typical setting temperature of fusible plugs used in fire safety systems, which is why they are not the correct answer.