How many amps is MCCB?

MCCB (full form: moulded case circuit breaker) is used for 250 amps to 800 amps in the motor feeders. This system of circuit breaker basically protects the entire electrical system from overloading and having such conditions of short circuit issues.

How is MCCB rating set?

Long Pickup (Ir) value (multiplied by the ampere rating (In) of MCCB) sets the maximum current level which the circuit breaker will carry continuously. If MCB is 1000A Rating but Full Load current is 800A than MCCB Rating can be changed from 1000A to 800A by setting it 0.8, Now Ir=0.8XIn =0.8×1000=800Amp.

How do I know my MCCB rating?

The numeral part indicates rating of MCB in Ampere….These are generally:

  1. Product Modal No.
  2. Max Current Rating. (6, 10, 16, 20, 25, 32, 40, 60, 63 etc)
  3. Operation Symbol.
  4. Breaking Capacity Type.
  5. Breaking Capacity (Max Short Circuit Current)
  6. Operating Voltage(230V, 400V, 440V)
  7. Tripping Curve Type.
  8. Energy Class.

What is a 32 amp MCB used for?

Typical Uses for Domestic MCBs 32 Amp – Ring Final. The technical term for your power circuit or sockets. A two bedroom house for example may have 2 x 32A power circuits to separate upstairs and downstairs sockets. Larger dwellings can have any number of 32 A circuits.

What is the difference between 6kA and 10kA MCB?

The capability of the MCB to operate under these conditions gives its short circuit rating in kiloamps (kA). In general for consumer units a 6kA fault level is adequate whereas for industrial boards 10kA fault capabilities or above may be required.

How is MCCB breaking capacity calculated?

Multiply the number of sets of electrical windings or other components by the voltage each offers. For example, if you are calculating the breaking capacity connected with a three-phase 520-volt transformer, multiply 3 by 520, giving 1,560 volts. Divide the volt-amperage running through the circuit by this voltage.

What is ICU in MCCB?

What is Icu: Icu is nothing but unlimited break Capacity of the circuit breaker Which means the circuit breaker can break the maximum fault current without damage. Typically for MCB the maximum Icu will be 6KA to 10 KA for MCCB Icu may be 200kAmps.

What is IM in MCCB?

Short Time Pick up Value (Im) (multiplied by the ampere rating) sets the short circuit current level at which the circuit breaker will trip after the set time delay.

What is K in MCCB?

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.