Formula MCCB Selection Table

Ics = Rated service short-circuit breaking capacity
Ics = 50% Icu
Ics = 25% Icu
Example: For A2C 250
Icu =25kA, Ics = 50% Icu
Therefore, Ics = 12.5kA

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Description

Description

MCCB Selection Table
Ics = 50% or 25% Icu

Rated Current Icu = Rated ultimate short-circuit breaking capacity
10kA 16kA 25kA 36kA 50kA
16A
20A
25A
32A		 A1A 125
A1A 125
A1A 125
A1A 125		 A1B 125
A1B 125
A1B 125
A1B 125		 A1C 125
A1C 125
A1C 125
A1C 125		 A1N 125
A1N 125
A1N 125
A1N 125		 –
–
–
–
40A
50A
63A
80A		 A1A 125
A1A 125
A1A 125
A1A 125		 A1B 125
A1B 125
A1B 125
A1B 125		 A1C 125
A1C 125
A1C 125
A1C 125		 A1N 125
A1N 125
A1N 125
A1N 125		 –
–
–
–
100A
125A
160A
200A		 A1A 125
–
–
–		 A1B 125
A2B 250
A2B 250
A2B 250		 A1C 125
A2C 250
A2C 250
A2C 250		 A1N 125
A2N 250
A2N 250
A2N 250		 –
–
–
–
250A
320A
400A
500A		 –
–
–
–		 A2B 250
–
–
–		 A2C 250
–
–
–		 A2N 250
A3N 400
A3N 400
A3N 630		 –
A3S 400
A3S 400
A3S 630
630A – – – A3N 630 A3S 630