Which fire suppression device uses a solder or glass bulb valve fuse?

Question

Options

• AWater sprinkler
• BFire extinguisher
• CWater mist system
• DGas flooding system

• A
  75% (15)
• B
  15% (3)
• C
  5% (1)
• D
  5% (1)

Explanation

Water sprinklers use either a solder (fusible) link or a glass bulb filled with liquid as their valve fuse - heat from a fire melts the solder or shatters the glass bulb, releasing the valve and allowing water to discharge. Fire extinguishers (B) are manually operated portable devices with no heat-activated fuse mechanism. Water mist systems (C) use fine droplets and are typically activated by detection systems or manual controls, not a solder/glass fuse. Gas flooding systems (D) discharge suppression gases (like CO₂ or FM-200) and rely on electronic detection triggers, not thermal fuses.

Memory tip: Think of the glass bulb as a "heat thermometer" - when the room gets hot enough, it pops and the sprinkler drops water. The red or green liquid in those small glass bulbs is a classic visual you've likely seen on ceiling sprinkler heads.

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