Series Welwyn Components Predictable fusing characteristics
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Fusible Nickel Film Resistors
Series
Welwyn Components
Predictable fusing characteristics Constant current fusing Flameproof
Electrical Data
Power rating 70°C Resistance range Resistance tolerance* Standard values Thermal impedance Ambient temperature range °C/watt watts ohms ppm/°C Figure preferred
Below only.
Physical Data
Dimensions (mm) Weight mounting centres 10.2 Min. bend radius
Type
21.0
Construction
nickel film deposited high purity ceramic rod. caps force fitted termination wires welded caps. resistive film adjusted required value helical cut; finally flame retardant lacquer protection applied resistor body resistor marked with indelible ink.
Marking
Resistors colour coded with five bands. Four bands used indicate value tolerance, with colours being used. fifth black band denotes constant current fusibility.
Solvent Resistance
body protection marking resistant normal industrial cleaning solvents suitable printed circuits.
Terminations
Material Strength Solder-coated copper wire. terminations meet requirements 68.2.21
Flammability
resistors will burn emit encandescent 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 Issue 03.02
Welwyn Components Limited Bedlington, Northumberland NE22 7AA,
Telephone: 1670 822181 Facsimile: 1670 829465 Email: info@welwyn-tt.com Website: www.welwyn-tt.com
Fusible Nickel Film Resistors
Series
Welwyn Components
Performance Data
Maximum Load: 1000 hours 70°C Shelf life: months room temperature Derating from rated power 70°C Long term damp heat Resistance solder heat Fusing characteristics zero 155°C Figure
Packaging
resistors supplied tape packed ready loading automatic sequencing insertion machines. Component wires will protrude beyond outside edge tapes. Alternative packaging available request. detailed Packaging Data Sheet available upon request. Lead Formed resistors also supplied. Standard options Lancet, Radial Goalpost forming shown Lead Form Information section
Fusing
After fusing final resistance value will times initial value.
Standard Quantities Package
Type Large ammo pack 5000
Body location
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
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