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One Bank-single phase and Neutral
Mounting
Type
MCB
Ways
Box Assembly
Lis No
+ Front
Plate
List No
= Consumer
Unit
List No
Without Hinged Protective Cover
Surface 4 4 + 30 = 104
6 6 + 30 = 106
9 9 + 31 = 109
12 12 + 32 = 112
Flush 6 6 + 30/2 = 106/2
9 9 + 31/2 = 109/2
12 12 + 32/2 = 112/2
Without Hinged Protective Cover
Surface 4 4 + 30/1 = 104/1
6 6 + 30/1 = 106/1
9 9 + 31/1 = 109/1
12 12 + 32/1 = 112/1
Flush 6 6 + 30/3 = 106/3
9 9 + 31/3 = 109/3
12 12 + 32/3 = 112/3
Maximum earth fault loop impedance in ohms for circuits supplying socket outlets (also fixed equipment in bathrooms).
Device Rating of Device
5A 15A 20A 30A 45A
Type 1 MCB 12 4 3 2 1.33
Rewirable Fuse 9.6 2.7 1.8 1.1 0.6
House Service Fuse 11.4 3.4 1.8 1.2 0.6
Type 2 MCB 6.8 2.3 1.7 1.1 0.75
Type 3 MCB 4.8 1.6 12. 0.8 0.53
Renard Service of Ratings
Device 6A 10A 16A 20A 32A
Type 1 MCB 10 6 3.75 3 1.87
HRC Fuse 8.7 5.3 2.8 1.8 1.1
Type 2 MCB 5.67 3.4 2.12 1.7 1.06
Type 3 MCB 4 2.4 1.5 1.2 0.75
Note: At these values of loop impedance fuses will operate within 0.4 sec.and MCB’s will operate in 0.1 second
Typical Operating Characteristics for Crabtree MCB’s


BS 3871
Type
Instantaneous trip current range Typical
Application
Crabtree MCB
1 2.7-4 In Domestic Starbreaker
2 4-7 In Commercial/Light Industrial Polestar
C50
3 7-10 In General
Industrial
Polestar

 

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