Interested to Buy Any Domain ? << Click Here >> for more details...
What are the difference between C-Curve and D-Curve for
MCB's.
- 17 Answers
- 192299 Views
- ABB, DLF, Essar, GK companies, Nissi Engineering Solution, I also Faced
- E-Mail Answers
Answer Posted / h.shastri
almost all answer is somewhat correct
the main thing is to selection of proper MCB which matches
with your equipments and instruments
for that i'd like to give you an case study...
let's Assume one Heating Control Action
suppose i am using a 1ph. heater of 1200 Watt (5.2 Amps)
now i am controlling heating action using an SSR or
relay/contactor
now if i will select SSR (relay/contactor)'s rating =6 amps
and i also impliment MCB of 6 Amps.b-curve
then in case of heater failer or implimenting different
rating's heater,
assume that circuit is taking some higher current say, 10
Amps in such my SSR(relay/contactor)will damage due to high
load current which is higher then their rating of 6 Amps
but MCB will not trip instently ( it trips after 5-10 min.
because load current is not more then 12 Amps)
in this case MCB will not protect your instruments.
now if i'll decrease MCB's rating it will starts tripping
on and on.....
if i'll select MCB more then 6 Amps again in this case MCB
will not trip
so that, if i m using b curve 6 Amps MCB then i must select
SSR(relay/contactor)'s rating more then 12 Amps say 15Amps.
then and then problem will be solve.
also if i will use MCB of C or D curve then Again i have to
choose instruments which has atleast 3-5 times higher
rating of MCB.
| Is This Answer Correct ? | 66 Yes | 12 No |
Post New Answer View All Answers
What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?
can mini-curcuit supply MIL-tested transformer !
Where can I get CPWD electrical specifications & Shedule of rates? Please help me
ult of expression 'document.FrmQF.myem
What is the use of oil in transformers?
where is core-type and shell-type construction suitable for transformers ?
Safety of on line ups
If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these
what is the use of current transformer in power transformer secondary side.?its connectyed in WTI
what is the grounding Calculation formula? spouse i want to provide grounding to 3phase 18kw motor or i want to provide ground to 3phase 10kva dry type transformere or you give me any exemple...... Thanks.
Why do we apply both Differential and REF (HV and LV) protection schemes on YNyn configuration of a transformer?
In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?
how to commissioning the genset with amf panel?
How do the synchronizing lamps indicate the correctness of phase sequence between existing and incoming alternators?
How one can check the MAIN of a house wiring ?
