Electromechancial Circuit Breakers 2

[GARL]

hi guys and gals,

I am new to these devices but could any one provide me with a website or reference as to the components of a Electromechanical Circuit Break. Also, their safety features if any one has any experiences with these devices.

Thanks a lot!

Garl

 

[candu6]

There is a lot of information about the operation and maintenance of breakers. What type/manufacturer are you working with?

 

[dpc]

If you're talking about industrial molded case circuit breakers, you could go to the GE Industrial Systems website and search for GET-2779 as a starting point.

I also have a good manual from Westinghouse called Breaker Basics, circa 1994 or so. Maybe Eaton/Cutler Hammer still makes it available.

 

[GARL]

I'm looking for information on electromechanical circuit breakers for commercial aircrafts. I spoke to an engineer and he mentioned something about a 3 pole circuit breaker for 3 phase circuit protection manufactured by Mechanical Products.

The reason for this research is a report that I'm writing to compare electromechanical circuit breakers to solid state power controllers.

I found sufficient information on solid state power controllers but I couldn't find much on electromechanical circuit breakers.

Thank you for your help.

 

[jraef]

You may have some terminology problems here, or perhapse aircraft components use significantly different terms than those used in general industrial equipment. In industry, a Circuit Breaker is a protective, switching and fault isolation device. It has elements that monitor current, and open the disconnecting means (contacts) under over current and / or short circuit conditions. When open, a Circuit Breaker is also providing isolation of the load from line potential.

Solid State Power Controllers are methods of providing regulated control of power, either by zero-cross switching or phase-angle control, but do not necessarily contain protective circuitry. Solid state also is not generally considered an acceptable means of off-state isolation because they have leakage potential. Why don't you describe what you intend to do so we can get around your use of terminology that may be confusing.

"Venditori de oleum-vipera non vigere excordis populi"

 

[GARL]

I'm quoting from the following article:

"It uses programmable SSPC devices in place of traditional electromechanical circuit breaker technology..."

The link to the article is:

http://www.flightdailynews.com/singapore2002/feb26/avionics/sepds.shtm

Can someone please clarify this for me? It'll be greatly appreciated.

 

[jraef]

Well, the article is about a brand new technology that Honeywell has probably spent a considerable amount of money to develop and maintain exclusivity on. I will go out on a limb here and say that this deals with some sort of a marriage of both technologies heretofore unseen in general industry. It sounds as if Honeywell has found a way of using solid state switching devices as protective devices as well, while overcoming their deficiences typical for this kind of application. Pronably too expensive for general industrial consideration at this point, but (obviously) has applications in commercial aircraft.

"Venditori de oleum-vipera non vigere excordis populi"

 

[IRstuff]

This is what was (is) used on the AH-1 Cobra helicopter:

http://incolor.inetnebr.com/iceman/pilot24.htm

and commercially:

http://aerospace.eaton.com/products/power_load_subsystems/circuit_breakers.html

http://aerospace.eaton.com/products/power_load_subsystems/performance_rated_relays.html

TTFN