FA8025 series Welwyn Components Predictable fusing character

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FA8025 series Welwyn Components Predictable fusing character

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Fusible Metal Film Resistors
FA8025 series
Welwyn Components
Predictable fusing characteristics Flameproof protection
Electrical Data
FA8225 Power rating Resistance range Limiting element voltage Resistance tolerance Standard values Thermal impedance Ambient temperature range C/watt watts ohms volts ppm/° 0.25 FA8325 preferred FA8425 0R15
Physical Data
Dimensions (mm) Weight mounting centres 10.2 12.7 20.3 Min. bend radius
Type FA8225 FA8325 FA8425
14.5
19.6 23.8
Construction
metal film deposited high purity ceramic rod. caps force fitted termination wires welded caps. resistive film adjusted required value helical cut; finally cement protection applied resistor body marked with indelible ink.
Marking
Resistors colour coded with five bands. Four bands used indicate value tolerance, with colours being used. FA8325 FA8425 types fifth yellow band denotes constant voltage fusibility.
Solvent Resistance Terminations
Material Strength Solder-coated copper wire. terminations meet requirements 68.2.21. body protection marking resistant normal industrial cleaning solvents suitable printed circuits.
Flammability
resistors will burn emit incandescent particles under condition applied temperature power overload.
Solderability terminations meet requirements 115-1, Clause 4.17.3.2.
General Note
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's data considered accurate time going print. subsidiary electronics 03.02 Issue 01.07
Welwyn Components Limited Bedlington, Northumberland NE22 7AA,
Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Fusible Metal Film Resistors
FA8025 series
Welwyn Components
Performance Data
Maximum Load: 1000 hours 70°C Shelf life: months room temperature Derating from rated power Temperature rapid change Resistance solder heat zero 155° Typical
Predicting Fusing Time Defined Power Input
Graphs
Fusible Resistors: Typical Fusing Window
Graph
Normal rated power
Fusing:
After fusing final resistance value will times initial value. graph explanation fusing curves. Graph
Fusing Time (secs)
power guaranteed fusing
fusing time
fusing time Initial Power (watts)
sale fusing power
Packaging
preferred method packaging taped ammo packed, figure critical dimensions. Alternative packaging available special request. Graph Lead Formed resistors also supplied. Standard options Lancet, Radial Goalpost forming shown Lead Form Information section. Figure
Graph Body Location
Type
FA82*
FA82/FA83
FA84
Standard Quantities Package
Type Ammopack FA8225 5000 FA8325 2500 FA8425 1000
Welwyn Components Limited Bedlington, Northumberland NE22 7AA, Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Issue 03.02 01.07

FA8025 series Welwyn Components Predictable fusing character

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