What is this component?

[alex1878]

It's on the PCB of a light switch. It's got "TF" written next to it on the board and on the component itself it says "2A 250V". Is it a fuse?

Also, is this big yellow brick a capacitor? It has no markings on it.

 

[Arouse1973]

Thermal Fuse?
Adam

 

[KJ6EAD]

PTC (positive temperature coefficient) thermal fuse and polyester film capacitor.

 

[alex1878]

Thanks both! I'm kind of new to electronics so I hadn't seen a fuse like this before.

 

[KJ6EAD]

They reset themselves when they cool down, usually ten minutes or so at room temperature but usually have to be disconnected from power to cool.

 

[alex1878]

Thanks for the info. I'm assuming that fuse is dead now since the board is charred and the switch no longer works -

- but I want to harvest the transistor from the board. Do you think it will still work fine? I don't have a transistor tester yet!
Btw that charring is right under the switch.

 

[davenn]

but I want to harvest the transistor from the board. Do you think it will still work fine? I don't have a transistor tester yet!

difficult to know until it is tested