# How do I choose a MCB for a 3 phase motor?

Contents

## Which MCB is used for motor?

For instance, for electric motors or low voltage lighting the use of a type B MCB may give unwanted tripping and the choice of a type C MCB will probably solve the problem.

## What is the difference between 6ka and 10ka MCB?

The main difference between the two is their capacity, with the MCB rated under 100 amps with an interrupting rating of under 18,000 amps.

## What is a Type 2 MCB?

For example, a Type 2 MCB has a multiple of 7 (from {Table 3.3}) so a 30 A device of this type will operate over the time range of 0.04 s to 8 s at a current of 7 x 30 A = 210 A.

## What is a 16 amp MCB used for?

The purpose of the MCB rating is to protect the cables by preventing them from carrying a current greater than they can handle under fault situations.

## What is rated current in MCB?

(2) Rated Current (In /Ie):

It is the current value above which overload protection is tripped. For MCB it is fixed while in MCCB the rated current is an adjustable range instead of a fixed value. Standard rating of MCB is 1A, 2A, 3A, 4A, 6A, 10A, 13A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 100A for MCB.

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## What size breaker do I need for a 3 phase motor?

The breaker must be sized for 7.6 * 1.25 = 10 Amps . Therefore, it is good practice to size the breaker at 15 Amps.

## What size breaker do I need for a 20 amp motor?

Use 12-gauge wire for a 20-amp circuit, 10-gauge for 30 amps, 8-gauge for 40 amps, and 6-gauge for 50 amps.

## What size breaker do I need for a 150 hp motor?

Electrical motor wiring data – NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

Motor HP NEMA amps Motor Circuit Protector type HMCP (ampere)
60 77 150
75 96 150
100 125 200
125 156 250