Component Identification

[bjrtech44]

Hi All,
I am repairing a circuit board. I have gone thru most of it and replaced several components like diodes and capacitors to update it but now I am stumped. I have a component that looks like a diode but the symbol on it looks like it might be a transistor. I have never seen a symbol like this. It's the last thing I need to replace to get my board active again. It steps down or regulates 120v. Any help would be greatly appreciated.
Thanks

 

[tronitech]

160mA fuse?
Does it measure short circuit or open circuit?

 

[bjrtech44]

It measures open. No resistance whatsoever. I did not test for a voltage drop when it was in the circuit.

 

[bjrtech44]

I really didn't think about it being a fuse or fuseable link. The symbol is really throwing me off. It is a new symbol to me. I might try a fuse and see if it comes alive.
Thanks

 

[Nigel Goodwin]

I really didn't think about it being a fuse or fuseable link. The symbol is really throwing me off. It is a new symbol to me. I might try a fuse and see if it comes alive.
Thanks

The 'symbol' isn't any such thing, it's just a manufacturers logo - but it's clearly marked 160mA, so it couldn't be much else than a fuse.

However, I've never seen a fuse like it - and while I've seen LOT'S of different types, there's always something obscure comes along that you've never seen before.

What actually is the circuit board?.

 

[debojitacharjee]

It's either a circuit breaker or a fuse.

Blatant advertising deleted - moderator.

 

[singhtel]

hi..
The component you’re looking at is likely a PolySwitch resettable fuse or PTC (Positive Temperature Coefficient) thermistor fuse. These components protect circuits by limiting current when a threshold is exceeded, allowing the fuse to “reset” once the fault is cleared, unlike traditional fuses that need replacing.

 

[singhtel]

some key points...

1. Symbol and Labeling: The unique symbol and “160mA” label indicate that this component has a current-limiting role. A PTC thermistor would match this, as it would regulate or “trip” at this current level.
2. Use in Circuit: This fuse would be crucial in circuits that step down or regulate higher voltages like 120V AC, protecting downstream components from overcurrent situations.
3. Replacement: Make sure to replace it with a fuse of the same rating (160mA) to ensure proper circuit protection. You can find similar components with identical current ratings at electronics suppliers.

 

[singhtel]

If you still have any doubts or want to confirm the specific type of fuse to purchase, feel free to ask!