Electronic – Does anybody know what kind of component this is

identification

In the picture below, there are 4 green components. Does anybody know what kind of component they are?

Some information:

  • When the circuit is live, I measure no voltage drop.
  • My multi-meter measures 0 ohms in either direction.
  • The context is the power input stage of the whole pcb.

enter image description here

Update:

I actually found a visually identical part:

enter image description here

It is a PTC Resettable fuse, by Bel Fuse, PN 0ZCJ0100FF2E. So there you go.

Best Answer

Three possibles in order

  1. Ferrite Inductors, used sometimes to reduce conducted noise on power supplies. DC Resistance is zero, but 10-1000 ohms at high frequency.
  2. 'Poly Fuses' 'PTC Resistors' 'Resetable Fuse' Often have low resistance. When they heat up the resistance goes up which limits the current due to a fault.
  3. Sense Resistors, used to sense current. Often these have very low resistance (much less than an ohm)
  4. Zero Ohm resistors, sometimes these end up on power supply rails so that engineers can measure current.
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