Wirewound High Surge Resistors

WHS Series

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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.

© TT electronics plc

08. 12

Maximum

Typical

Load at rated power: 1000hrs @ 25°C

ΔR%

5 +0.001

Ω

3

Dry heat: 1000hrs @ 200°C

ΔR%

5 +0.001

Ω

3

Short term overload

ΔR%

5 +0.001

Ω

1

Derating from rated power @25°C

Zero at 280°C (See Thermal Performance graph).

Climatic

ΔR%

5 +0.001

Ω

2

Climatic category

55/200/56

TRC & Vibration

ΔR%

5 +0.001

Ω

1

Robustness & solder heat

ΔR%

5 +0.001

Ω

1

Long term damp heat (56 days)

ΔR%

5 +0.001

Ω

1

Terminations

Material:

Hot tin dipped copper wire

Strength:

The terminations meet the requirements of IEC 68.2.21

Solderability:

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.

Flammability

The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload.

Solvent Resistance

The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.

Performance Data

Pulse Performance

1

10

100

1

10

100

1000

Value (ohms)

Surge / Pulse Energy Capacity

(single or low repetition rate, R < 5%)

WHS5

WHS3

WHS2

WHS7