I am working with a Firgelli Linear Actuator Control board and came across an unusual component. At first I thought it was a heatsink, but there does not appear to be any component under the metal. It's very difficult to get a good image of it, but here are side and top views:
The inscribed label is:
X185F
UCK
Where the "X" could be some sort of logo (two intersecting V's, one inverted).
The three pins over it are for connecting RC servo input, and are not connected.
The lower metal tab is connected to Vcc as far as I can tell.
Edit:
The original link has broken. It appears the controller is also an Actuonix Linear Actuator Control (LAC) board.
Best Answer
It's a TE Connectivity SMD185F-2 PolySwitch.