Identify this component! (SMD, 4 PIN)

Other Hardware General Electronics
1

Hey all, I need help identifying a component. The device works properly off of battery voltage, but does not operate off of the 24V AC supply. So I started with the PSU. I have no schematics, just a meter (protection diodes, biasing resistors, and capacitors are fine). I found the following part would cause the device to work if pressure were applied (assuming broken connection within component)

Is this some type of inductor, or transformer?

There are no markings other than the screenprint of 'CMC1'

FST-100.jpg
FST-100.jpg697×801 151 KB

2

Answered my own question, It seems to be a CHOKE. Second opinions?

3

maybe it is a optocoupler

4

Opto couplers are usually 5 or 6 pins.

5

Why would a choke have four connections ?

6

cmj:
Answered my own question, It seems to be a CHOKE. Second opinions?

It looks like a dual choke to me.

(edit to add): Like this:

7

It does look like ferrite which bears this out - but more context in the
picture would be useful, is this a power supply, power conditing circuit
or what?

If its a dual choke expect the resistance to be < 0.1 ohm per 'winding'
the multimeter can see things human eyes cannot!