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Basic Knowledge Fusible Plug
Basic Instrumentation - Basic Fusible Plug


Actually the construction of fusible plug as a tubing fitting so sometimes some people call it fusible fitting,
the main part of fusible plug contain a eutectic alloy plug. The eutectic alloy plug has a specific melting point. For example you can see the rating of each melting point as in the table. The temperature rating is signed by color.

Stamp Color Melting Point in °F (deg °C)
160 Black  160 °F (71 °C)
212 Orange  212 °F (100 °C)
255 Green  255 °F (124 °C)
281 Red  281 °F (138 °C)

* reff: fusible plug swagelok

Sensor Fusible Plug:




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