what is acb/mccb? its function?difference in electrically/mechanically?

Answer 1

As stated above an ACB is an "air circuit breaker", MCCB is a "molded case circuit breaker".

They both serve the same function, which is to isolate a circuit either because you want the power off or to isolate because there is a fault. They both use trip units which monitor the current flowing through the brk and trip when it gets too high.

Difference is a ACB typically has what is called an iron frame, meaning it is pretty much all metal. It comes in both low (600V and down US) and medium voltage (2400V-27KV) and various amperage's. ACB's are designed to be completely tore down to the bare bones and rebuilt.

A MCCB has a housing that is made from non conductive material. Available for low voltage applications and comes in amperages from the single poles in the panel in your house to 3 phase and about 4000A. MCCB's are not meant to come apart. You can get'em apart, but they really are not meant for rebuilding.

Another term you may hear is ICB which is insulated case breakers. These are fairly new, last 8-10 yrs in the US. They provide the best of both worlds, complete maintainability and a non conductive housing. These are available for low voltage applications and amperage wise just over 6000A

You can open and close both electrically and mechanically. Although with the MCCB adding this option typically cannot be done in the field.

A MCCB is basically an "air" breaker, it just has everything crammed in a smaller footprint.

Answer 2

ACB means air circuit breaker.In ACB arc is produced during making and breaking and air is used as arc quenching media.
MCCB means moulded case circuit breaker.Contacts are placed inside moulded casing.
ACB can be closed and opened electrically as well as mechanically.
MCCB is closed mechanically and can be opened electrically as well as mechanically.

Answer 3

ACB: air circuit breaker
MCCB: moulded case circuit breaker
ACB uses air to quench the arc produced during making/breaking of contacts.
MCCB is classified on the basis of size & rating,so a MCCB may be ACB.

Answer 4

Mccb Circuit Breaker

Answer 5

ACB is nothing but Air circuit breaker and Vcb is Vaccum. circuit breaker..The main difference between last two thing. is the arc quenching medium.ACB is air and VCB is. vaccum.these two things are used for power tr and.
MCCB menas Moulded case Circuit Breaker -- it is used for. 25oAmps to 800Amps in the motor feeders. ELCB means Earth Leakage Circuit Breaker.
https://www.electrikals.com/products/r/lv-switch-gear/a?cid=689&cnid=132&cnid=142&page=1&pageSize=15

Answer 6

???
It'd help no end if you gave a bit more information ☺

Doug