1/2/22, 1:58 PM
MCCB: How to safely choose a new one to replace it?
5 Factors
Consider
Replacing
MCCB
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Molded Case Circuit Breaker are trickier to replace as they typically handle more power than a
Miniature Circuit Breaker. They are often found in the Main Switchboard or a Distribution Board
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The important factors to consider are as follow:
1. Frame Size
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2. Rated Current
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3. Ultimate Short-Circuit Breaking Capacity (Icu)
Other factors that may be important for your application are as follow:
1. Operating short-circuit breaking capacity (Ics)
2. Shun trip option
Example MCCB to be replaced
Schneider Compax NSX100B
NSX100 Frame Size (W x H x D) 140 x 161 x 86
Rated Current 100A
Breaking Capacity (Icu) (415V) 25kA
Frame Size
This determines the dimension of a circuit breaker. You will obviously have to select the MCCB
with the frame size that can fit the space. The Frame Size indicates the basic framework of the
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