Series Welwyn Components Predictable fusing characteristics

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Series Welwyn Components Predictable fusing characteristics

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Fusible Metal Film Resistors
Series
Welwyn Components
Predictable fusing characteristics Flameproof protection
Electrical Data
FM1/4 Power rating 70°C Resistance range Limiting element voltage Resistance tolerance Standard values Thermal impedance Ambient temperature range °C/watt watts ohms volts ppm/°C 0.25 FM1/2 preferred
Physical Data
Dimensions (mm) Weight mounting centres 10.2 12.7 18.4 Min. bend radius
Type FM1/4 FM1/2
12.5
21.0 19.6 17.8
Construction
metal film deposited high purity ceramic rod. caps force fitted termination wires welded caps. resistive film adjusted required value special 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. 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 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 Metal Film Resistors
Series
Welwyn Components
Performance Data
Maximum Load: 1000 hours 70°C Shelf life: months room temperature Derating from rated power 70°C Temperature rapid change Resistance solder heat zero 155°C
Fuse Times
FM1/2 Fuse Times
Pulse Time (seconds)
Pulse Time (seconds)
Initial Power
Initial Power
Packaging
resistors supplied tape packed ready loading automatic sequencing insertion machines. standard taping method critical dimensions shown figure Component wire will protrude beyond outside edge tapes. Lead Formed resistors also supplied. Standard options Lancet, Radial Goalpost forming shown Lead Form Information section. detailed Packaging Data Sheet available request. Figure
Pulse Time (seconds)
FM1/4 Fuse Times
Initial Power
Fusing
After fusing final resistance value will times initial value.
Body Location
Standard Quantities Package
Type Large ammo pack FM1/4 5000 FM1/2 2500 1500
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

Series Welwyn Components Predictable fusing characteristics

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