Three legged component

[MartinTT]

Hello here, i have a problem identifying three legged component on automatic PIR light switch, it’s capacitor or something exotic? many thanks

 

[danadak]

I dont see 3 legs on the yellow disc ? Which seems to be marked as a 430
pf ceramic capacitor.


Regards, Dana.

 

[Nigel Goodwin]

Or a VDR?, but looks like two pins - a picture of more area would give context. But from so far, looks like on the mains input?.

 

[MartinTT]

hello, at home ill make better photo from other side

 

[alec_t]

Zoom out a bit, so that some adjacent components, and any circuit board markings/designators, are visible.

 

[Papabravo]

It looks like a PTC resettable fuse.

Resettable PTC (PPTC) Fuse Basics - Codrey Electronics

This post is a quick introduction to resettable PTCs (PPTCs). A polymeric positive temperature coefficient device (PPTC) is a passive electronic component used to protect against overcurrent faults in electronic circuits. Simply put, a PPTC […]

www.codrey.com

 

[MartinTT]

here we go, photo from other side and zoomed out

 

[AnalogKid]

Looks like a PolySwitch, a positive temperature coefficient resistor that acts as a self-resetting fuse.

Or, could be two back-to-back Y capacitors as part of a power line filter (although I've not seen one).

ak

 

[MartinTT]

strangely it has three legs

 

[Nigel Goodwin]

strangely it has three legs

As it has V1 printed next to it, that makes it look more like a VDR - however, while it has three legs it has two obvious separate components inside, one large, one small. This is 'similar' to a posistor, which was used to degauass CRT's back in the day, and consisted of two thermistors, one positive coefficient, and one negative.

But you're still only giving us a tiny picture, so we've no idea what it might be doing - or what it's in - there's no context.

 

[MartinTT]

apologize here the bigger view, maybe helps with identification, it’s legrand motion sensor light switch

 

[Nigel Goodwin]

Presumably the three terminals are live in, live out, and neutral?. Probably the component is some kind of protection, possibly against lightning pulses?. Why do you want to know?.

 

[MartinTT]

Presumably the three terminals are live in, live out, and neutral?. Probably the component is some kind of protection, possibly against lightning pulses?. Why do you want to know?.

because on the other switch this component blew, new switch is expensive and they don’t do this design anymore, in house we have six more….

 

[Nigel Goodwin]

because on the other switch this component blew, new switch is expensive and they don’t do this design anymore, in house we have six more….

OK, can you draw that part of the circuit out, so we can see how it's connected - the component, the three pin terminal connector, and where it goes to.

 

[MartinTT]

OK, can you draw that part of the circuit out, so we can see how it's connected - the component, the three pin terminal connector, and where it goes to.

there is a photo from the back side

 

[Nigel Goodwin]

there is a photo from the back side

It's double sided, and you can't see the traces on the top, nor do we know what the terminal connections are.

 

[Papabravo]

It's double sided, and you can't see the traces on the top, nor do we know what the terminal connections are.

Some people are just incapable of compliance with a simple request. It would require some amount of effort and industry on their part which they are unwilling to expend to get to a solution. Easier to ask someone else to do it by -- magic perhaps?

 

[MartinTT]

ok thank you to everybody, it’s resettable polyswitch, but can’t figure out which one

 

[Nigel Goodwin]

ok thank you to everybody, it’s resettable polyswitch, but can’t figure out which one

So why does it have three pins?.

 

[MartinTT]

So why does it have three pins?.

https://m.littelfuse.com/media?resourcetype=datasheets&itemid=f5807569-0c49-445b-857a-8272c5b2f3d7&filename=littelfuse-varistor-lvm2p-catalog-datasheet