Miniature eutectic alloy fusible links for large or very large series applications

Manufactured in a fully automated way, these fire detection fuses are particularly economical for domestic applications in mechanical ventilation, extractor hoods. They are also externally coated with an alloy protecting them from corrosion.

Maximum permanent load (DaN)

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Raw material

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Description

 

Manufactured in a fully automated way, these fire detection fuses are particularly economical for domestic applications in mechanical ventilation, extractor hoods. They are also externally coated with an alloy protecting them from corrosion.

Minimum Order Quantity: 10 000 pcs

Material: Brass (possible realization in red copper if shorter response times are required).

Surface Protection: Eutectic alloy.

ROHS compliance: These fusible links are available in two versions.

  • Non-ROHS compliant, using traditional alloys containing lead and cadmium, for temperatures 68°C (155°F); 72°C (162°F); 96°C (205°F); 103°C (218°F); 120°C (248°F).
  • ROHS compliant, using ternary alloys based on bismuth, tin and indium, (the high cost of indium makes these models 2 to 3 times more expensive than the previous ones) for temperatures 60°C (140°F);

72°C (162°F); 79°C (174°F); 109°C (228°F); 117°C (242°F).

Identification: Model, temperature in °C and date of manufacture are printed on each fusible link.

Tests:

  • Mechanical resistance at ambient temperature: 100% in
  • Trip temperature under static load: by statistical
  • Trip time in temperature rise under load according to ISO 10294-4: by statistical
  • Holding load 1h at 60°C or 90°C: compliant and verified by statistical sampling in production (Test according to ISO 10294-4).
  • Triggering under minimum load: compliant and verified by statistical sampling in production (Test according to UL33).

Salt spray resistance: According to ISO9227-2012, subjected to a mist formed of 20% by weight of sodium chloride in distilled water, at 35°C for 5 days (120h), the apparatuses retain their aptitude for the function, in the response times specified by the standard.

Type 5E2 5E3 5E4 5E5 5E6
Welding surface (mm²) 84 mm² 159 mm² 224 mm² 258 mm² 80 mm²
Maximum permissible permanent load * (DaN) 8.5 DaN 16 DaN 22 DaN 26 DaN 8 DaN
Minimum breaking load 2N 4N 4N 4N 3N
Response time according to ISO 10294-4 under maximum load **  

2min 43 sec

 

2min 46 sec

 

2min 51sec

 

2min 51sec

 

2min 38sec

* Maximum permanent load depends on alloy composition and ambient temperature. Values are given for guidance only, and for a 72°C non ROHS eutectic alloy. Alloys with temperatures below 72°C and those that are RoHS compliant, generally have a high proportion of Indium, which greatly reduces the mechanical strength.

** Values measured in our own testing equipment. Testing conditions and equipment comply with ISO10294-4 and ISO DIS 21925-1 2017, fig. C1.

Main references

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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.