Interested to Buy Any Domain ? << Click Here >> for more details...
what is the difference between Ith & Iu rating in MCCB.
Particularly on SACE ABB Circuit Breaker?
- 2 Answers
- 18484 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
Why AC & DC capacitor are use in UPS ??????????????????
what is the meaning of osr in transformer.
What safety precaution are to be taken for avoiding electric hazards ?
why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?
if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?
what is difference between speed mode and torque mode in motor?? explain in simple words please.
What will be the diameter of pipe between conservation tank and transformer
what is meant by impulse voltage?
how can get electrical c licence.now i am working in spining mill , transformer capacity 2750KVA. SANCTION DEMAND 2250KVA. PLEASE ADVISE ME . MY CONTACT NO 09944226823
What are the effects of electrical faults?
Difference between drift current and diffusion current?
xpression 'document.FrmQF.myemail' [
please explain to me how to calculate current,voltage,resistance with formula??
sir, iam a electrical engg graduate and i want to go in automation sector and for this i have decided to do industrial training for this,plz suggest me some good institute for the same in delhi,ncr. my degree percentage is 58%, can i get job after doing training, plz help....
what is inter connected dc generator?
