Fast Fusible Metal
• Low power fusing
• Predictable fusing characteristics
• Flameproof protection
Power rating at 70˚ C
Limiting element voltage
Ambient temperature range
0R1 - 10K
0R10 - 27K
-55 to 155
0R2 - 1K5
Dimensions (mm) & Weight (g)
Type L D f
max max min
WFF1 12.5 4.2 17.8
d PCB Min.
nom mounting bend
0.6 10.2 0.6
0.8 12.7 1.2
0.8 18.4 1.2
The metal film is deposited on a high purity ceramic rod. End
caps are force fitted and termination wires welded to the
caps. The resistive film is adjusted to the required value by a
special helical cut. A fuse aid coating is then applied. Finally a
cement protection is applied to the resistor body prior to
marking with indelible ink.
Solder-coated copper wire.
The terminations meet the requirements of
Solderability The terminations meet the requirements of
IEC 115-1 Clause 184.108.40.206.
Resistors are colour coded with 5 bands. Four of the bands
are used to indicate values and tolerance, with IEC 62 colours
being used. A fifth yellow band denotes constant voltage
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
The resistors will not burn or emit incandescent particles
under any condition of applied temperature or power
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: firstname.lastname@example.org · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issuee DE · 031..0067