Welwyn 4.7Ω Wire Wound Resistor 3W ±5% W21-4R7JI
- RS Stock No.:
- 139-3441
- Mfr. Part No.:
- W21-4R7JI
- Brand:
- Welwyn
Save 56% when you buy 500 units
Subtotal (1 bag of 5 units)*
£4.86
(exc. VAT)
£5.83
(inc. VAT)
FREE delivery for orders over £50.00
In Stock
- 375 unit(s) ready to ship
- Plus 260 unit(s) ready to ship from another location
- Plus 1,000 unit(s) shipping from 08 October 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
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
Specifications
Technical Reference
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
---|---|---|
Brand | Welwyn | |
Resistance | 4.7Ω | |
Power Rating | 3W | |
Tolerance | ±5% | |
Technology | Wire Wound | |
Series | W20 | |
Temperature Coefficient | ±200ppm/°C | |
Maximum Operating Temperature | +200°C | |
Minimum Operating Temperature | -55°C | |
Select all | ||
---|---|---|
Brand Welwyn | ||
Resistance 4.7Ω | ||
Power Rating 3W | ||
Tolerance ±5% | ||
Technology Wire Wound | ||
Series W20 | ||
Temperature Coefficient ±200ppm/°C | ||
Maximum Operating Temperature +200°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
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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