Datasheet

Widap AG
CH-3185 Schmitten
Tel.: [phone]
Fax: [phone]
eMail: [e-mail]
Internet: www.widap.ch
5-2-01
Edition 02.14
E
K. S. INSTRUMENTS PVT. LTD.
K. S. INSTRUMENTS PVT. LTD.
KHA SERIES
The KHA style is a range of high
quality, high stability Aluminium
housed Power resistors designed for
direct heat sink attachment.
A wide range of resistance values is
available in 5 to 300W.
Design of higher wattage resistors for
special applications can be done with
ease.
! Excellent Heat transfers and small
dimensions
! Good Electrica l Sta bil ity,
reliability and mechanically very
rigid
! Non Inductive version available
! Values from R01 to 150K
! Custom Terminations, Mounting
Arrangements possible
! RoHS Compliant
Characteristic Condition Compliance
Tolerance ± 5%
(Tighter Tolerance available on request) For Values greater than 1  ± 0.25% to ± 5%
Temperature Co-efficient For Values less than 100  60 PPM/°C
(Lower TCR's available on request) For Values greater than 100  30 PPM/°C
Insulation Resistance Dry/Normal 10 G min
Change in Resistance
- Short time overload 10x rated voltage for 5 secs ± 0.5%
- Shelf Life After 3 years < ± 1%
Incombustibility 16x Rated Wattage for 5 secs No Flame
Operating Temperature From -25°C to 250°C
For Values less than 1 
GENERAL SERIES CHARACTERISTICS
ALUMINIUM HOUSED POWER RESISTORS
POWER DERATING
Power Derating Chart
0
20
40
60
80
100
120
0 25 50 75 100 150 200 250
Temp (degC)
r
e
w
o
P
d
e
t
a
R
%
Aluminium housed wire-wound resistors series WD
Data sheet
General description
The WD style is a range of high quality, high stability Aluminium housed power resistors designed for direct heat
sink attachment. A wide range of resistance values is available in 5 to 300 W. Design of higher wattage resistors for
special applications can be done with ease.
Features
• Excellent heat transfers and small dimensions
• Good electrical stability, reliability and mechanically very rigid
• Non inductive version available
• Values from R01 to 150K
• Custom terminations, mounting arrangements possible
• RoHS compliant
General series characteristics
Characteristic Condition Compliance
Tolerance
(Tighter tolerance available on request)
Forvalueslessthan1Ω
Forvaluesgreaterthan1Ω
± 5%
± 0.25 to ± 5%
Temperatureco-efcient
(Lower TCR available on request)
Forvalueslessthan100Ω
Forvaluesgreaterthan100Ω
60 ppm / °C
30 ppm / °C
Insulation resistance Dry / Normal 10GΩmin
Change in resistance
- short time overload
- shelf life
10x rated voltage für 5 sec
After 3 years
± 0.5%
< ± 1%
Incombustibility 16x rated wattage for 5 sec Noame
Operating temperature From - 25°C to 250 °C
Power derating