Multiplied action mechanisms for eutectic fusible links, for application in smoke outlets

Made of 3mm thick galvanized steel, these reduction mechanisms are compatible with most fusible links available on the market. Their high coefficient of reduction enables them to be used with links with a small welding area. Indeed, the traction on the fusible links is only 15% of that applied to the mechanism. The annual replacement of the links is simple and can be done without special tools.

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Description

5516: Permanent maximum load*: 170 DaN

5518: Permanent maximum load*: 180 DaN

5525: Permanent maximum load*: 230 DaN

5540: Permanent maximum load**: 300 DaN

 

* Maximum continuous load at ambient temperature calculated as a function of fuse link welding area, (with non-ROHS eutectic alloy at 72 ° C). Moderator coefficients are applicable for other alloys. (See technical introduction)

** For model 5540, the maximum continuous load at ambient temperature calculated as a function of the fuse weld surface, (with a non-ROHS eutectic alloy at 72°C), exceeds the mechanical strength limit of the device.

Made of 3mm thick galvanized steel, these reduction mechanisms are compatible with most fusible links available on the market. Their high coefficient of reduction enables them to be used with links with a small welding area. Indeed, the traction on the fusible links is only 15% of that applied to the mechanism. The annual replacement of the links is simple and can be done without special tools.

Equipped with an appropriate fusible link, they withstand the 300 DaN overload during 5 minutes, required for smoke extraction applications.

Material: Zinc plated steel.

  • On two steel cables equipped with rope
  • On a steel cable equipped with rope thimble in the 6.2mm hole and a wall mounting bracket in the 8.2mm hole. These accessories are described at the end of this catalog.

ROHS compliance: These mechanisms are ROHS compliant, but the conformity of the assembly when fitted with fusible links depends on the conformity of the fusible link (See the technical data sheets of the fusible links).

Identification: Model and date of manufacture are stamped on each mechanism. When equipped with a fusible link, the link has its own identification (See the technical data sheets of the fusible links).

Functional Tests:

  • Mechanical strength at ambient temperature with a 300 DaN overload during 5 minutes: checked by statistical sampling in
  • Triggering in temperature under minimum load of 27 DaN, fitted with a fusible link having a minimum triggering load of 4 N: checked by statistical sampling in production.

Salt spray resistance: According to ISO 9227-2012, subjected to a mist formed of 20% by weight of sodium chloride in distilled water, at 35°C for 5 days (120h), the fusible links retain their aptitude for the function.

Options : AISI 304 Stainless steel models.

Main references

Downloads

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Technical informations associated to this product

  • Historical and technical introduction of fusible alloys and fire safety fusible links

    The earliest known piece made of lead and tin alloy seems to be an Egyptian vase found in Abydos, dated around 1400 BC. During the Roman Empire, lead was used for the construction of water pipes. Melting at 325°C,
  • Historical introduction to temperature measurement

    The temperature measurement was preceded by a long period, throughout the 18th century, when first empirically and then gradually more accurately, have been developed measurement scales, were discovered fixed points for the calibration of these scales, and all physical variations related to temperature change: thermal expansion of gases, liquids, metals and other solids, liquefaction temperatures, boiling temperature, magnetism, thermoelectricity, just to give a few.
  • Temperature sensing principles

    The bimetal strip is formed by two co-laminated metal. One has a high coefficient of expansion, the othera lower or zero. When the strip is heated, it bends proportionally to the temperature. These bimetal blades are generally flat and fixed at one end. But they can be wound in a spiral shape, although this arrangement most often used in the construction of thermometers.