I have no clue of the PCB where this component was. enter image description here The reference H400 60 and a logo that is unreadable are located in the top of the package. enter image description here I didn't found any datasheet or valuable information in google. There's a metal holder and a small cylinder inside the part. enter image description here

enter image description here

The small cilinder appears to be made by two materials.

The inside material is condutive.

The outside material is isolant.

I can't measure any capacitance in the cylinder.

Thanks in advance.

  • \$\begingroup\$ Can you measure any voltage or resistance between the two sides? \$\endgroup\$
    – Finbarr
    Oct 26, 2019 at 20:28
  • \$\begingroup\$ No voltage is present. Resistance is very small (32 Ohms with a Fluke 87V) \$\endgroup\$
    – AmssmA
    Oct 26, 2019 at 20:39
  • 2
    \$\begingroup\$ looks like a solid state starting relay for a refrigerator compressor \$\endgroup\$
    – jsotola
    Oct 26, 2019 at 22:16

1 Answer 1


This looks very much a like a power PTC used for example for demagnetizing cathode-ray tubes. The ceramic gets high-resistance when it heats up.

And indeed, googling for "H400 PTC" yields e.g. this link at a random seller offering a component looking alike, but I was unable to quickly find a data sheet.

  • \$\begingroup\$ I agree with it being a ptc, the numbers also verify ptc as possible component \$\endgroup\$
    – Jordan R
    Oct 27, 2019 at 14:19
  • \$\begingroup\$ I agree component is a Ptc as the number indicates ptc \$\endgroup\$
    – Leon
    Oct 27, 2019 at 23:05

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.