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1.77
Data is subject to errors and technical modifications.
Miniature Circuit Breakers
Time Current Characteristics
Commercial
Distribution
0.01
0.1
1
10
10
1000
10000
10
1
Time in seconds
100
Current in multiple of rated current
MCB Curve B Time Current Characteristic
Calibration temperature: 30˚C
0.01
0.1
1
10
100
1000
10000
10
1
Time in seconds
100
Current in multiple of rated current
MCB Curve D Time-Current Characteristic
Calibration temperature: 30
°
C
0.01
0.1
1
10
100
1000
10000
10
1
Time in seconds
100
Current in multiple of rated current
MCB Curve C Time-Current Characteristic
Calibration temperature: 30
°
C
B Curve (BS EN 60898)
MCBs: MTN rated 6 - 63A
NBN rated 6 - 63A
C Curve (BS EN 60898)
MCBs: NCN rated 0.5 - 63A
MLN rated 2 - 32A
HMF/HMC rated 80 - 125A
D Curve (BS EN 60898)
MCBs: NDN rated 6 - 63A
HMD rated 80 - 125A