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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|
*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.
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.
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)
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.
On request, we produce OEM de-multiplied actuating mechanisms, to reduce constraints on the fusible links.
On request, we produce OEM fusible alloy molded parts and threaded caps for pressure vessels and pressure regulators
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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