Phoenix Contact over voltage protector

Here is tear-down of PT 2X2-24DC-ST
over voltage protector for 24V systems: PT protective connector with protective circuit for two 2-wire floating signal circuits. 24 V DC nominal voltage. HART-compatible.

What is insideComponents close-upWhat was found was two dual gas discharge tubes ant two other over voltage protectors. The gas discharge tubes were connected to pins at one end (two protectors for two signal wire pairs).The contacts on other and go to flexible circuit board that has just those surgectors/zeners in it. Look like a bit of complicated electro-mechanical construction because it looks like just directly soldering the components to pins on bottom had done the same.


  1. Tomi Engdahl says:

    The gas discharge tubes connected between ground and signal wires are
    230 11

    Based on those numbers it seem that those could be 230V DC spark-over voltage devices.

    The surge arresting devices between signal wires pair wires are
    which are
    ESD Suppressors / TVS Diodes 1500W 40.2V Bi-Directional

  2. weaver game says:

    So important! we should create more articles to share on all issues

  3. fnaf says:

    What a nice post! Thank you so much and I am really looking forward to reading more and more articles from you


Leave a Comment

Your email address will not be published. Required fields are marked *