Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 32 replies
  • Subscribers 27 subscribers
  • Views 1527 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Unusual MCB

Sparkymania
Here's an interesting one.

Federal Electric 20A MCB. Had no type on it and was taking a long time to trip. Opened one up and discovered why it didn't have a type.

Others with it were ECC but virtually the same design. Only thermal. Both are plug in types called stab-lok and are bakerlite.


No instantaneous trip mechanism. Only a thermal one.



34200b5e07a12e120f5fc679b8b1b9aa-huge-mcb-with-no-instantanious-trip-mechanism-4.jpg
Parents
  • 0
    Banned in the USA now because they caused so many fires!   The USA typically has lower fault currents than UK commercial stuff... (I blew a few fuses over there without even realizing it!)


    But the thermal element can sometimes fail too, or the contacts weld... especially if closed on a fault.


    Nasty things
Reply
  • 0
    Banned in the USA now because they caused so many fires!   The USA typically has lower fault currents than UK commercial stuff... (I blew a few fuses over there without even realizing it!)


    But the thermal element can sometimes fail too, or the contacts weld... especially if closed on a fault.


    Nasty things
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines