IET
Decrease font size
Increase font size
 search :  help :  home
latest topics : statistics
Topic Title: Breaking Capacity of a Miniature Circuit Breaker Challenged.
Topic Summary:
Created On: 16 April 2018 07:51 PM
Status: Read Only
Linear : Threading : Single : Branch
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
16 April 2018 07:51 PM
User is offline View Users Profile Print this message



Zoomup

Posts: 4444
Joined: 20 February 2014

A 10kA M.C.B. tested for robustness. Do not try this on the kitchen table. http://www.youtube.com/watch?v=9_KrpSM1qZU

Z.
Top : Bottom
16 April 2018 09:50 PM
User is offline View Users Profile Print this message



mapj1

Posts: 10809
Joined: 22 July 2004

That is the subtle difference between a fault the breaker can interrupt, and a fault it can not only interrupt but also remain for for further use.
That was an unfair test trying ot break 7kV DC would have meant the arc would never have extinguished as the contacts opened, so all that hot gas has to go somewhere, in this case outwards.

-------------------------
 regards Mike
Top : Bottom
17 April 2018 09:42 AM
User is offline View Users Profile Print this message



AJJewsbury

Posts: 16834
Joined: 13 August 2003

I agree - nothing like a fair test to put a.c.-only rated equipment through a d.c. test - it's far harder to extinguish a d.c. arc than an a.c. one.

(I'm not sure I agree with the poster's comments about HBC fuses either - fuses too have have much more difficulty breaking a d.c. current than a.c. - I suspect a HBC fuse in similar circumstances might be equally 'spectacular')

- Andy.
Top : Bottom
17 April 2018 04:37 PM
User is offline View Users Profile Print this message



kellyselectric

Posts: 318
Joined: 22 July 2016

This guys name is Rodalco2007 hes a Dutchman now living in New Zealand he does lots of nice experiments like that. Fortunately he knows what hes doing as he works for the local DNO in his bit of NZ.
Top : Bottom
IET » Wiring and the regulations » Breaking Capacity of a Miniature Circuit Breaker Challenged.

Topic Tools Topic Tools
Statistics

New here?


See Also:



FuseTalk Standard Edition v3.2 - © 1999-2018 FuseTalk Inc. All rights reserved.

 
..