What is the difference between MCB & MCCB,
Where it can be used,
- 22 Answers
- 136841 Views
- ACB Group, Badve, Bajaj Electricals, Hensel, Siemens, SR, I also Faced
- E-Mail Answers
Answer Posted / prakesh kumar
MCB mean "Main Circuit Breaker", meaning the primary
circuit breaker in a group or panelboard / switchboard. In
IEC world, it means "Miniature Circuit Breaker", typically
a DIN rail mounted circuit breaker in a small format that
is limited to 100A, and is intended for use in
installations with low fault current capacity (under 25kA)
unless protected by upstream fuses. In NEMA world, these
devices entered under special rules adopted by UL (UL1077)
and are called "Supplementary Circuit Protectors" because
they did not meet the criteria already established
for "circuit breakers" under UL489. In recent years, many
manufacturers have come out with special versions that do
now meet the UL489 standards for circuit breakers, so the
term MCB has taken on a dual meaning. So in NEMA world, the
acronym MCB now has contextual relevance. MCBs /
Supplementary Circuit Protectors are sealed units that can
be neither maintained or repaired, they are throw-away
devices.
MCCB Was originally an IEC term meaning Molded Case Circuit
Breaker, but has been very well adopted in NEMA world now,
at least at the engineering level. Many rank and file
electricians still are not familiar with that acronym
because its widespread use in NEMA world is fairly recent.
MCCBs generally range from 15A to 1600A, with a few
exceptions at either end, and generally start at 14kAIC but
go up to 100kAIC for applications with high fault current
capacity. There are versions that are Current Limiting (CL)
as well. MCCBs are typically sealed units and cannot be
serviced, although in larger sizes there are versions with
interchangeable parts that can be replaced such as trip
units and switch bodies.
| Is This Answer Correct ? | 79 Yes | 19 No |
Post New Answer View All Answers
What is big transformer parts and their function ? Ty
What type of a DC motor would you use for a lift?
when generator short circuit condition, the current how dissipates. or at short circuit voltage not available then current how can flow?
What is the meaning of Insulation H for transformers????
i have applied for junior engineer 2 c&w for Guwahati RRB please send me last five year question paper
What is CCM in Electrical ? where can we use this material?
Why we are using only Dyn11 tranformer in distribution system but not using a Dyn1 in distributing system?why not and advantage and disadvantage in both
why we use single core 630mm2 cable for transformer secondary side
WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.
How phase to phase voltage comes 440V.
What is steady state response?
Keywords: Die, Card, Coin, B/N 2 To 12
what is a bus riser in power system and why it is used
What is the formuala to calculate the rating of motor protection circuit breaker
we have earthmat at 110KV substation.we would like to take earth resistance.b some says that by connecting earth megger terminals (C1,P1) at middile point of earthmat (at riser) will cause voltage gradient at other earthmat nods and dont get exat earth resistance.when connecting at end nods will get exat value . is it correct .please explain
