Wirewound High Surge Resistors
WHS Series
Terminations
Material:
Strength:
Solderability:
Hot tin dipped copper wire
The terminations meet the requirements of IEC 68.2.21
The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
Marking
WHS2, and WHS3 resistors are marked with four colour bands in conformance with IEC62.
WHS5 and WHS7 resistors are legend marked with type reference, resistance value and tolerance.
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.
Performance Data
Maximum
Load at rated power: 1000hrs @ 25°C
Dry heat: 1000hrs @ 200°C
Short term overload
Derating from rated power @25°C
Climatic
Climatic category
TRC & Vibration
Robustness & solder heat
Long term damp heat (56 days)
ΔR%
ΔR%
ΔR%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
ΔR%
ΔR%
ΔR%
ΔR%
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
5 +0.001Ω
55/200/56
1
1
1
Typical
3
3
1
2
Zero at 280°C (See Thermal Performance graph).
Pulse Performance
Surge / Pulse Energy Capacity
(single or low repetition rate, R < 5%)
100
Energy (joules)
WHS7
10
WHS5
WHS3
1
WHS2
1
10
Value (ohms)
100
1000
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 ]
