Fast triggering eutectic alloys fusible links, brass or copper

Made of thin metal, these fusible links have the shortest response time, between 2 minutes 50 seconds and 3 minutes, for a temperature rise rate of 20°C/min from 25°C, but the fineness of the metal limits their mechanical strength.

Maximum permanent load (DaN)

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Raw material

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Thickness (mm)

Hole distance (mm)

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Description

 

Made of thin metal, these fusible links have the shortest response time, between 2 minutes 50 seconds and 3 minutes, for a temperature rise rate of 20°C/min from 25°C, but the fineness of the metal limits their mechanical strength.

Material: Brass (red copper possible on request).

Surface Protection: No special surface protection

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 non-Rohs types) 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 stamped on each fusible link

Tests:

  • Mechanical resistance at ambient temperature: 100% in production
  • Trip temperature under static load: by statistical sampling
  • 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 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, in the response times specified by the standard.

 

Type

  

5EQ

  

5EW

  

5EK

 5EO

(Improved mechanical

breaking load model)
Welding surface (mm²) 175 mm² 230 mm² 225mm² 205mm²
 

Maximum permissible permanent load (DaN)

 18 DaN theoretical * but limited to 9 DaN because of the low mechanical breaking load at 25°C ** 23 DaN theoretical * but limited to 9 DaN because of the low mechanical breaking load at 25°C ** 23 DaN theoretical * but limited to 9 DaN because of the low mechanical breaking load at 25°C ** 20 DaN theoretical but limited to 16 DaN because of the low mechanical breaking load at 25°C *
Minimum triggering load 4N 4N 4N 4N
Mechanical breaking load at 25°C for brass fusible links 27 DaN 28 DaN 28 DaN 48 DaN
Mechanical breaking load at 25°C for copper fusible links 26 DaN 27 DaN 26 DaN 46 DaN
Response time according to ISO 10294-4 under maximum load *** 2 min. 55 sec. 2 min. 58 sec. 2 min. 53 sec. 2 min. 53 sec

* Maximum permanent load depends on alloy composition and ambient temperature on 72°C fusible links. 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.

** The maximum permanent load is limited to 1/3 of the mechanical breaking load at 25°C

*** 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 

Downloads

Datasheets

Drawings

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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.