Normal Short CIrcuit Protection
Normal Short CIrcuit Protection
(OP)
Good day!
120V AC line with load rated @ .18Hp Actuator Motor, 1Phase, 3a FLA. It is of very small HP rating and low FLA, operating intermittently as draft fan vane actuator, would Miniature CB be suitable as motor and line protection?
Any suggestions/discussions?
Any particular model and brand that caters this rating?
Thank you very much!
120V AC line with load rated @ .18Hp Actuator Motor, 1Phase, 3a FLA. It is of very small HP rating and low FLA, operating intermittently as draft fan vane actuator, would Miniature CB be suitable as motor and line protection?
Any suggestions/discussions?
Any particular model and brand that caters this rating?
Thank you very much!





RE: Normal Short CIrcuit Protection
Are you referring to the Short-Circuit Withstand Capability of the circuit breaker?
JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"
RE: Normal Short CIrcuit Protection
If you want to go beyond that, pretty much any supplemental protector could be used and MANY companies sell those breakers in sizes under 15A. That type of protector (breaker) is commonly DIN rail mounted and is listed under UL1077. For a 3A motor something around 5A to 6A should work.
RE: Normal Short CIrcuit Protection
xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Normal Short CIrcuit Protection
RE: Normal Short CIrcuit Protection
What about O/L protection? A standard 15A panelboard type CB is OK for S/C protection, but does not provide any O/L protection?
Does the motor have integral O/L protection? IF not why not use a manual motor-starter, per the following link?
http://raise.rockwellautomation.com/RAConfig/resul...
GG
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)
RE: Normal Short CIrcuit Protection
RE: Normal Short CIrcuit Protection
Assuming, because it is 120V that this is North America somewhere, 120V will come from a single pole circuit breaker or fuse. So as long as you run wire rated for the rating of that CB, for example #14 for a 15A breaker, you don't need further circuit protection for a vane actuator. See NEC Article 430.42(A), because these devices typically fall under 430.32(B).
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: Normal Short CIrcuit Protection
If this actuator is particularly crucial it should be protected by sensing it's position and tripping an alarm if it is not in the proper position(s) within an appropriate time of its actuation/deactivation.
.
(Me,,,wrong? ...aw, just fine-tuning my sarcasm!)
RE: Normal Short CIrcuit Protection
Thank you!
RE: Normal Short CIrcuit Protection
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: Normal Short CIrcuit Protection