What is the condition of MCB in closed condition?
In the closed condition of an MCB, the switch is positioned at œON. By observing the positions of the switching latch one can determine the condition of MCB whether it is closed, tripped or manually switched off. The trip unit is the main part, responsible for the proper working of the miniature circuit breaker.
What is MCB?
What is MCB, Construction, Working, Types of MCB B, C, D, K ? MCB (Miniature circuit breaker), an electrical switch is used to interrupt the circuit under fault conditions such as overload and short circuit. It was invented by Mr. Stotz-Kontakt in 1891. MCB does not interrupt the circuit under the earth fault condition.
How to determine the condition of MCB?
In the closed condition of an MCB, the switch is positioned at œON. By observing the positions of the switching latch one can determine the condition of MCB whether it is closed, tripped or manually switched off.
Why does the MCB open in the same way?
Hence the MCB will open in same manner. Again when operating lever of the miniature circuit breaker is operated by hand, that means when we make the MCB at off position manually, the same latch point is displaced as a result moving contact separated from fixed contact in same manner.
Does MCB trip the circuit under earth fault condition?
MCB does not interrupt the circuit under the earth fault condition. In earlier days, we used fuses to trip the circuit under abnormal conditions. Fuse will protect the circuit by blowing themselves; hence you need to replace the same with a new one.
What is the MCB capability rating?
This rating refers to the capability of MCB that can trip or interrupt the circuit under short circuit conditions. It is expressed in Kilo Amps (KA). This rating must not be less than the prospective short-circuit current. The prospective short-circuit current is the maximum current that exists in the circuit during short-circuit conditions.
What is the meaning of Ka rating of MCB?
kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. If the current goes beyond this value, the circuit breaker could be damaged. kA rating is known as the short circuit withstand capacity or ultimate breaking capacity of a circuit breaker. It is denoted by Icu.
What is the MCB rating of a circuit?
MCB rating is very important and be very precise about it. Operating Voltage: It is in Volts and is the operational voltage for which current rating is said. In three phase it is usually 400V or 415 V. For single phase it is 230V or 240V. Choose as per your application only.
What is a type MCB?
A Type MCB trips off the circuit when the current exceeds 2-3 times the actual current rating. A type MCB “ Miniature Circuit Breaker is highly sensitive to the short circuit and hence we can find its application in the manufacturing of semiconductors.
What is the maximum power a MCB can withstand?
Your MCB can withstand up to 20A, beyond that level, our MCB will consider as overload or over current. 10000 Maximum short circuit current capacity: Your MCB short circuit withstand is range 10kA. Beyond that limit, MCB will not be in the original state which may damage physically.