50 pcs - W21-3R9JI Welwyn 3.9Ω Wire Wound Resistor 3W ±5% W21-3R9JI

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. It should also be noted that for repetitive pulses the average power dissipated must not exceed the continuous power rating of the resistor.CECC approvedSuitable for harsh environmentsImpervious lead free vitreous enamel coatingOverload characteristics ideal for protection circuitsHigh stability and reliabilityHigh power dissipation for size