Hi to all,
Can anyone tell me what are these components in photo above (left and right ones) and what is the purpose to use them. Thanks.
Electrical – the name of this component and purpose?
componentspcb
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Best Answer
The white ones are gas discharge tubes (GDT), similar to Bourns series 2051.
You can search the markings from various datasheets and probably identify the ratings. Possibly Littelfuse SG90 series.
They are used to deal with very high energy transients (hundreds of volts and up to thousands of amperes) from outside the board, such as that resulting from nearby lightning strikes.
The other ones (on the left) are, I believe, PTC (resettable fuse) devices to limit current. They have very limited interrupting capacity and voltage capability and are there mostly to protect the PCB traces from moderate overload, most likely.