Axial / Through Hole Resistor?

This is from an ESD Dimmable LED Driver. These between the incoming 120VAC and the Bridge Rectifier. On the board the label says MOV1, RF1, and F1, at the location of these. Unfortunately, the manufacturer doesn't offer a replacement unit and I have been unable to find "ESD", so it is on me.

What I think is the good one measures 22Ohms and the body is 9mm long, the center of the body is 3.5mm thick, while the ends of the body are 3.8mm thick.

VW-1 is the name of the common UL vertical flame rating for electrical parts and wire fire safety. RF1 & F1 usually designate fuses (standard and resettable).

I believe that is a flame proof safety fuse assembly, and since it’s blown in a very destructive way, it likely means some other parts of the circuit went bad causing the this part to blow. Using the wrong device as a replacement could be a fire safety hazard.


Many such products designed for minimal cost will use a fusible resistor in such a position rather than a proper fuse. If it’s blown, it indeed is a likely indication that there are faults elsewhere. Replacement of the entire unit would be the expected and likely most economical fix.

I would replace the unit, but I am unable to find the manufacturer “ESD” anywhere. I will post a picture of the case when i get home in a couple of hours.

Hi Stupidav,

Can you post a few images of the driver itself? An overall image, plus zooming in on any labels/text would be useful to try to identify, and/or possibly find a compatible alternative.

Sorry for the delay, been a little hectic around here. The previous components have been removed from the board, although you can see where they went.

I did finally get a phone number for the manufacturer of the fixture but have been unable to reach them due to the holidays. I had to look at the instruction manual for a different fixture that was made by the same company just to get the number.

The PCB has three separate parts locations.

  1. On the left edge mounted standing up, F1 should be a standard one shot fuse to give a permanent circuit break for fire safety
  2. At top, mounted diagonally, would be an MOV1 (metal oxide varistor) for surge damage resistance
  3. Bottom left mounted standing up, RF1 an automatically resetting fuse to help the MOV not burn out when absorbing surges