Series UL1412 recognised* Failsafe 240V mains fusing Good pulse h

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Series UL1412 recognised* Failsafe 240V mains fusing Good pulse h

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Pulse Withstanding Fusible Flameproof Metal Film Resistors
Series
UL1412 recognised* Failsafe 240V mains fusing Good pulse handling capability Small size power rating UL94-V0 flameproof protection
Values above. file number E234469
Electrical Data
EMC2
Power rating Resistance range 75C) Isolation Voltage Resistance Tolerance Standard Values Thermal Impedance Ambient temperature range Watts Ohms ppm/C Volts C/Watt +155
Physical Data
Dimensions (mm) Weight Type mount centres 18.4 bend radius 0.55
EMC2
Construction
metal film deposited onto high purity ceramic rod. caps force fitted termination wires welded caps. Finally, cement protection applied resistor body prior marking with indelible ink. cement protection applied manner that leaves terminations completely clear. This permits well-defined body length (clean lead clean lead dimension
Terminations
Material: Strength: Solderability: Solder-coated copper wire terminations meet requirements 68.2.21 terminations meet requirements 115-1 Clause 4.17.3.2
Solvent Resistance
body protection marking resistant normal industrial cleaning solvents suitable printed circuits.
General Note
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's test data considered accurate time print.
Welwyn Components Limited
subsidiary electronics
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com
Flammability
resistor coating UL94-V0 rated will burn emit incandescent particles under condition applied temperature power overload.
Marking
resistors colour coded with five bands. Four bands indicate value tolerance accordance with IEC62. Parts with tolerance have fourth band. fifth yellow band denotes constant voltage fusibility.
Performance Data
Load Rated Power: 1000hrs Shelf life: months room temperature Derating from rated power Climatic Climatic Category Temperature rapid change Resistance solder heat Zero 155C 50/155/56
Maximum
Pulse Performance
IEC61000-4-5 1.2/50s Pulse
10000
Single Rectangular Pulse
Power
1000
0.01 1000 10000
Value (Ohms)
Voltage
Pulse Duration (ms)
Fusing Performance
resistors fuse open circuit overload powers exceeding within time indicated Fusing Characteristic. Their fusing performance lower overload powers specified. resistors fuse safely event 115Vrms 240Vrms overload (line mains short circuit condition) without burning emitting incandescent particles. After fusing, resistance least times greater than original nominal value.
Fusing Characteristic
(Constant Voltage)
Max. Fusing Time
Initial Power
(4R7-8R2)
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's test data considered accurate time print.
(10R-68R)
General Note
Welwyn Components Limited
subsidiary electronics
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com
Application Notes
resistors dissipate full rated power, recommended that terminations should soldered closer than from body. operating temperature limits imposed some materials, derating necessary. estimate temperature rise expected calculated using thermal impedance figures given under Electrical Data. protect against fire under conditions overload, positive clearance least 13mm should provided between body resistor combustible materials. resistors also supplied loose packed with radial, goalpost lancet pre-formed leads, tape packed with radial pre-formed leads, blister tape with Z-formed leads mounting. Consult factory details.
Packaging
standard packaging taped boxed. critical dimensions shown Figure component wires will protrude beyond outside edge tapes. Alternative packaging available request. Figure Dimensions
EMC2
Standard Quantities Package
Type Ammo pack
Body location f1-f2 1.4mm
EMC2
2000
Ordering Procedure
Specify type reference, value tolerance shown this example EMC2 20%: EMC2 Type Value (use IEC62 code) Tolerance (use code)
Welwyn Components reserves right make changes product specification without notice liability. information subject Welwyn's test data considered accurate time print.
General Note
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Issue 03/07/03
Welwyn Components Limited
subsidiary electronics

Series UL1412 recognised* Failsafe 240V mains fusing Good pulse h

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