Wirewound High Surge Resistors
WHS Series
(10 pulses at 30s intervals, R < 5%)
Note the voltage shown is the nett voltage across the resistor. At low
values, the generator open circuit voltage will be higher due to the
generator's 2 ohm internal impedance.
s Peak Voltage Limit
Peak Voltage (kV)
10
1
0.1
1
10
Value (ohms)
100
1000
Thermal Performance
Body Temperature Rise
300
100
WHS3
WHS2
WHS5
WHS7
Proportion of Rated Power (%)
250
Temperature Rise (°C)
Temperature Rise (°C)
80
60
40
20
0
0
50
100
150
200
250
300
350
200
150
100
50
0
0
1
2
3
4
5
6
7
8
9
10
Ambient Temperature °C
(°C)
Am bient Tem perature
Power (W)
Application Notes
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than
4mm from the body.
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. The surface temperature rise
at the centre of the body is shown under Thermal Performance.
3. WHS2, WHS3, WHS5 resistors can also be supplied with goalpost or lancet pre-formed leads. Radial form is available on
WHS2 and WHS3 only.
WHS2, WHS3, and WHS5 are also available in an SMD format with Z formed leads and packed in blister tape. See the Z-form
datasheet for details http://www.welwyn-tt.com/pdf/datasheet/Z-form.pdf
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
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08. 12
WELWYN [ WELWYN COMPONENTS LIMITED ]
