what is the difference between Ith & Iu rating in MCCB.
Particularly on SACE ABB Circuit Breaker?
- 2 Answers
- 16297 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / mazed
Extract form appendix K of standard IEC 60947 -2
Voltage
• Ue = Rated operational voltage
• Ui = Rated insulation voltage
• Uimp = Rated impulse withstand voltage
Current
• In = Rated current
• Ith = Conventional free –air thermal current
• Ithe = Conventional enclosed thermal current
Short -Circuit
• Icm = Rated short circuit making capacity
• Icu = Rated ultimate short circuit breaking capacity
• Ics = Rated service short circuit breaking capacity
• Icw = Rated short time withstand current
Trip unit
• Ir = Adjustable overload setting current
• 1.05xIr = Conventional non –tripping current
• 1.30xIr = Conventional tripping current
• Isd = Short time delay tripping setting current
• Ii = Instantaneous tripping setting current
| Is This Answer Correct ? | 8 Yes | 0 No |
Post New Answer View All Answers
Is neutral transformer can be called as control transformer?
What is depreciation factor?
How PADO software increase the efficiency of power plant?
Explain about retrofitting of machine tool.
explain PV modules in solar energy generation.
c++ write a program to use a fuction call "max"which accepts an intger arrey of size5.as an arrument and return the larger and smallest of the arrey to main without changing. the original changing of the original position of the element of the arrey.
why output is out of phase in case of common emitter?
In our factory so many iron pillors are exists for supporting the shed/Hangar. If do more no of earthings at one piller instead of doing more earth pits in many locations and running earth strip around the hanger, I can save the money. Please suggest this method is acceptable as per Is specifications though the Earth resitance of the farthest piller is with in the limits as per IS specifications.
WHAT IS MEANING OF Gg & Gg IN hrc FUSE
what is the difference between interconnection and intraconnections in the circuit diagrams
What is superposition theorem?
Maintenance of transformer???
what is invertor supply and raw powersupply
what is a vector protection in transformer
How to convert a two phase power into a three phase power in induction machine?
