For 415v, 3phase, 22kw rating of motor how to calculate MCCB rating ?

Editor — Thu, 05 Aug 2021 03:57:26 +0000

Convert KW to HP (KW/0.75), multiply it by 1.5 gives you the rated current. Multiply it by 1.5 for breaker value.

Here we provide coordination chart link for required rating and model of MCCB.

What is MCCB ?

Molded case circuit breakers are a type of electrical protection device that is generally used for a wide range of voltages, and frequencies of both 50 Hz and 60 Hz.
The main distinctions between molded-case and miniature circuit breaker are that the MCCB can have current ratings of up to 2,500 amperes, and its trip settings are usually adjustable.

Currents above the rated value that last longer than what is normal for the application.

During a fault such as a short circuit or line fault, there are very high currents that must be interrupted directly.

This is a less common function of circuit breakers, but they can be used for that purpose if there isn’t a suitable manual switch.

Editor — Thu, 05 Aug 2021 03:17:21 +0000

MCCB	ACB	VCB
MCCB is stands for Moulded Case Circuit Breaker.	ACB is stands for Air Circuit Breaker.	VCB is stands for Vacuum Circuit Breaker.
The moulded case circuit breaker which use ark quenching device as AIR which is used upto 500 Amps only.	The Air Circuit Breaker which use quenching device as air and used upto 3000 Amps at 415 volts.	The Vaccum Circuit Breaker which use ark quenching device as a vaccum and used for 415 volts.6.6 KV,11 KV,33 KV,132 KV,220 KV also.
Thermomagnetic operaton-For large surges in ct- In distribution boards-bimetallic strip responding to less extreme but longer_term over_current conditions-applicable for low voltages.	Low volt power cb-trip characteristics r adjustable-air s the arc quenching medium applicable upto 440V.	Medium volt power cb-trip char. Adjustable-mechanical sys. used for trip & open-Vaccuum s the arc quenching medium-applicable upto 36kV.
MCCB s the used low rating Lt pannel.	ACB s the used high rating Lt pannel.	VCB s the used high rating Ht pannel.
MCCB is used for load purpose and is should used up to 1200-1500A only.	ACB is used for low tension (LT) panel it should carry up to 4000A and more.	VCB is used for high tension (HT) panel it means carry 11KV and low amps rating it can withstand at long time at high Voltage also.