Welwyn 4.7Ω Wire Wound Resistor 3W ±5% W21-4R7JI

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Subtotal (1 bag of 5 units)*

£4.86

(exc. VAT)

£5.83

(inc. VAT)

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  • Plus 370 unit(s) shipping from 27 October 2025
  • Plus 260 unit(s) shipping from 27 October 2025
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Units
Per unit
Per Bag*
5 - 95£0.972£4.86
100 - 245£0.466£2.33
250 - 495£0.438£2.19
500 +£0.418£2.09

*price indicative

RS Stock No.:
139-3441
Mfr. Part No.:
W21-4R7JI
Brand:
Welwyn
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Brand

Welwyn

Resistance

4.7Ω

Power Rating

3W

Tolerance

±5%

Technology

Wire Wound

Series

W20

Maximum Operating Temperature

+200°C

Temperature Coefficient

±200ppm/°C

Minimum Operating Temperature

-55°C

COO (Country of Origin):
IN
As there is a maximum temperature to which the wire can rise during an overload, if the resistor is already dissipating heat, then the pulse energy applied should be less than that allowed by the graph. Using the formula below we can estimate the “equivalent” energy of a pulse applied to a resistor that is already dissipating power.It should also be noted that for repetitive pulses the average power dissipated must not exceed the continuous power rating of the resistor.

CECC approved
Suitable for harsh environments
Impervious lead free vitreous enamel coating
Overload characteristics ideal for protection circuits
High stability and reliability
High power dissipation for size
Suitable for harsh environments
Impervious lead free vitreous enamel coating
Overload characteristics ideal
for protection circuits
High stability and reliability
High power dissipation for size

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