FIRE DETECTION FUSIBLE LINKS


Main types of fire detection fusible links

A fire detection fusible link is a mechanical component that breaks at a preset temperature. They are used in fire protection systems to open and close doors, vents, dampers, valves if the ambient temperature exceeds a certain value.

Picture Type Holes diameter (mm) Standard hole distance (mm) Standard thickness (mm) Average welding surface (mm²) Maximum permanent load (T‹Tc) in DaN*) Dimensions
fire detection fusible link 5EZ  4.3x2.3  9.1  0.3  72  7 fire detection fusible link
fire detection fusible link 5EG  2 clamps  10  0.8  144  14 fire detection fusible link
fire detection fusible link  5ED  5.2  16  1  192  19 fire detection fusible link
fire detection fusible link  5ES  6.5  18  1.2  198  20  fire detection fusible link
fire detection fusible link  5EE  6.9  23.7  0.8  216  21  fire detection fusible link
fire detection fusible link  5ER  6.9  23.7  0.8  216  21  fire detection fusible link
 fire detection fusible link  5EW  5.4  30.5  0.5  220  22  fire detection fusible link
 fire detection fusible link  5EP  5.1  25  1  230  23  fire detection fusible link
 fire detection fusible link  5EL  5  21.6  0.8  280  28  fire detection fusible link
 fire detection fusible link  5EV  6.3  32  1.5  450  45  fire detection fusible link
 fire detection fusible link  5EN  7  39.5  0.8  513  51  fire detection fusible link
 fire detection fusible link  5EM  9.2  41.4  1  513  51  fire detection fusible link
 fire detection fusible link  5EJ  6.9  46  0.8  544  54  fire detection fusible link
 fire detection fusible link  5EA  12.5  43.5  0.8  720  42  fire detection fusible link
 fire detection fusible link  5EY  10.3  50.8  1.5  722  72  fire detection fusible link
 fire detection fusible link  5EU  8  110  1.6  760  76  fire detection fusible link
 fire detection fusible link  5ET  10.3  59.6  1.6  798  80  fire detection fusible link
 fire detection fusible link  5EX  6.3  32.5  1.5  798  80  fire detection fusible link
 fire detection fusible link  5EH  12  95  1.5  1007  100  fire detection fusible link
 fire detection fusible link  5EF  7  95  1.5  1178  120  fire detection fusible link

*Maximum permanent load depends on alloy composition and ambient temperature. Values in this collumn are given for guidance only, and for a 70-72°C alloy. The following formula can be used as a first estimation of values: L= S/10, with L= maximum permanent load in DaN at temperature T‹Tc, and S= Average welding surface in mm². Some links with separating bumps or ramps may have sligthly higher values. Specific testing for a combination of alloy and fusible link type is made on request.


References codification

Fusible links are usually identified with coded manufacturing date, rated functioning temperature Tf in °C, manufacturer’s logo or name (JPC, JPCI, Ultimheat). A color code spot can be added on request, for customer using various temperatures of the same link type.

Standard functioning temperatures*

 Tf(°C)  47  65  68  70-72  92  96  103  120  138  175  182  221  227  280  327
 Tc(°C)  25  40  42  45  66  71  77  94  110  145  152  187   195  245  288
 Tf(°F)  115  150  155  165  195  205  220  250  280  350  360   430  440  540  620
 Tc(°F)  77  104  108  113  151  160  171  201  230  293  306  369  383  473  550

Tc (Holding temperature): the fusible link must not open or be destroyed when subjected to a temperature equal to Tc-6 °C (Tc-11°F) for a period of 168 hours under nominal strength.

Tf (Rated functioning temperature): It is the opening temperature of the fusible link in a calibration oven, when subjected to a strength equal to 1/10 of its nominal value, when temperature rises at a speed of 0.5 to 1°C / min (1 to 2°F/min). The opening temperature must not be lower than Tf-10°C or above Tf. Tf value is printed on the fusible link

Fuses frame material: Unless otherwise specified, the fuses are made of brass without plating. Upon request, they can be made of copper or steel, with plating (tin or zinc)

Welding: the welds are performed by induction in order to ensure complete melting of the alloy between the metal parts

Development: we carry all models according to customers drawings and achievable quality control specifications are available on request (depending on the specifications of the country of use)
*Most of these alloys use lead and cadmium.

Many other temperatures are available, consult our engineering department Available temperatures using alloys without lead or cadmium: 60, 72, 79, 139 °C (Ternary alloys of Bismuth, Indium and tin. Consult engineering department for MOQ and technical specs)

Eutectic alloys


A eutectic alloy is a mixture of chemical elements that has a single chemical composition that solidifies at a lower temperature than any other composition made up of the same ingredients.
This composition is known as the eutectic composition and the temperature is known as the eutectic temperature. A eutectic alloy solidifies at a single, sharp temperature and when it melts it does so at a single temperature. Alloys used in fusible links in our standard temperature ranges are eutectic, and their melting temperature (liquidus) and freezing temperature (solidus) are the same, without plastic melting range.
When a non-eutectic alloy solidifies, its components solidify at different temperatures, exhibiting a plastic melting range, and when they are used in fusible links there is no accuracy in the breaking temperature.
In some specific applications, because there is no existing eutectic alloy available for the temperature requested by a customer, we are then obliged to use non eutectic alloys. In this case we cannot guarantee the breaking temperature accuracy.


De-multiplied fusible link mechanisms type 55

On request, we produce OEM de-multiplied actuating mechanisms, to reduce constraints on the fusible links.


demultiplied fusible link mechanism  demultiplied fusible link mechanism  demultiplied fusible link mechanism  demultiplied fusible link mechanism


Fusible alloy molded parts, fittings and caps

On request, we produce OEM fusible alloy molded parts and threaded caps for pressure vessels and pressure regulators


 threaded cap with fusible core  Molded fusibe alloy pellet.

JPC sas
2 voie Gallo Romaine,
ZAC de la Bonne Rencontre,
77860 Quincy Voisins, France
Phone: +33(0)1 60 04 66 44
Fax: +33(0)1 60 04 84 44

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