Wirewound Resistor 3 Ohm 100W Aluminum Case Chassis Mounted Resistor - 2pcs

I used these to replace the factory fan resistors which can be problematic. You have to replace the whole fan because the resistors don’t come separate. I bypassed the factory resistors with these and they work perfectly. The best part is these are replaceable if they go bad.

Impressed with the overall quality. I purchased 4 of these. On my meter they all measured 2.3 Ohms so they are consistent. The Aluminum bodies have nice cooling fins and tabs with screw holes for mounting as seen in the picture. Sometimes you get an equivalent product instead of what is shown. I used these to adjust the impedance on a pair of speakers. Installed on the output of course so as not to color the sound or tone of the system. I think for the price they are a good value. Made in China. ( Dont tell Don). Happy customer.

Purchased and tested as spec

These are great for the price, but keep a few things in mind. There is absolutely no way these things are going to dissipate a 100W load over a sustained period of time. These are chassis mount resistors, so if you are planning to dissipate high wattage, make sure you thermally bond them to a heatsink or large mass metal chassis. I would estimate that in a stand alone application, you would not want to put more than a 40-50W load on them. That is typical spec without heatsink if you were to buy from a real component company ( not these Chinese knockoffs). If you are using these in a sensitive application you should also consider the 5% tolerance. With all that being said, these are cheap and work well as long as you have the right expectation for what you will be doing with them.

I measured 3.1 Ohm with the nominal 3 Ohm-cm. This is within 3%, within a normal tolerance range. I used them, connected in serial, as a load to measure internal resistance of a 12 volts SLA battery. They were dissipating around 8.6 watts each when connected to the battery. I put them on an aluminum plate (without any screws or heat conducting paste). Without cooling fan, their temperature reached slightly over 60 degrees Celsius and they started stinking. With a cooling desktop fan, the temperature dropped to more comfortable 40 C. I cannot say how they would run at 100 watts, but my guess is that without a massive radiator, they may be glowing red. They are relatively small and I doubt they can dissipate more than 10 watts without additional cooling. This is what I expected, most power transistors also need radiators to provide cooling to work at full power, nothing unusual with these resistors. Just plan accordingly.

Arrived on time , packaged well markings on the part we’re very light and hard to read

I bought these to test load power supplies and lead-acid batteries. The resistance value is accurate to within 5% so that's great. However, the power rating of 100. watts each is questionable. I have purchased 100 watt wirewound resistors from US industrial supply houses and they are MUCH larger (about 4 times the size of these). I ran a test where I clamped these resistors to a large aluminum heat sink and ran each resistor at 25 watts (1/4 of rating) without forced air cooling in a 75F laboratory. The resistor increased to 140F in 5 minutes and the temperature kept increasing. I suggest derating these power resistors and running them on a heavy heat sink with forced air convection.

I ordered these to put in the wiring harness for my taillights on my 2015 Silverado. I upgraded to LED bulbs and without these I got a regular warning message saying the bulbs were bad, and the hyper flash also drove me insane. Soldered some connectors on from harbor freight and soldered the wiring into the harness and since then the problem is fixed completely.