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Circuit-breakers, switch-disconnectors
Derating
2010 CA08103002Z-EN
www.eaton.com17/173
Reduction of the rated operational current (derating) under particular ambient conditions
(according to IEC 947)
Device part no.
Release type
Derating coefficient
20 °C
30 °C
40 °C
50 °C
60 °C
65 °C
70 °C
Electronic release (E)
System protection
NZM...3(-4)-AE(F)250...500(-NA)
E
1
1
1
1
1
1
1
NZM...3(-4)-AE(F)550...630(-NA)
E
1
1
1
1
0.9
0.85
0.8
NZM...3(-4)-AE250...400 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...3(-4)-AE630 + XAV
E with XAV
0.96
0.92
0.87
0.83
0.78
0.75
0.73
NZM...4(-4)-AE(F)600...1250(-NA)
E
1
1
1
1
1
1
1
NZM...4(-4)-AE1600
E
1
1
1
1
0.87
0.85
0.82
NZM...4(-4)-AE630...1250 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...4(-4)-AE1600 + XAV
E with XAV
1
0.98
0.93
0.89
0.85
0.83
0.8
Selectivity and generator protection
NZM...2(-4)-VE(F)100...175(-NA) (-S1)
E
1
1
1
1
1
1
1
NZM...2(-4)-VE(F)200...250(-NA) (-S1)
E
1
1
1
1
0.9
0.85
0.8
NZM...2(-4)-VE100...160 + XSV
E with XSV
1
1
1
1
1
1
1
NZM...2(-4)-VE250 + XSV
E with XSV
1
1
1
0.94
0.88
0.84
0.81
NZM...3(-4)-VE(F)250...500(-NA)
E
1
1
1
1
1
1
1
NZM...3(-4)-VE(F)550...630(-NA)
E
1
1
1
1
0.9
0.85
0.8
NZM...3(-4)-VE250...400 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...3(-4)-VE630 + XAV
E with XAV
0.96
0.92
0.87
0.83
0.78
0.75
0.73
NZM...4(-4)-VE(F)600...1250(-NA) (-S1)
E
1
1
1
1
1
1
1
NZM...4(-4)-VE1600 (-S1)
E
1
1
1
1
0.87
0.85
0.82
NZM...4(-4)-VE630...1250 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...4(-4)-VE1600 + XAV
E with XAV
1
0.98
0.93
0.89
0.85
0.83
0.8
Motor protection
NZM...2-ME(SE)90...140(-CNA)
E
1
1
1
1
1
1
1
NZM...2-ME(SE)220(-CNA)
E
1
1
1
1
0.9
0.85
0.8
NZM...2-ME90...140 + XSV
E with XSV
1
1
1
1
1
1
1
NZM...2-ME220 + XSV
E with XSV
1
1
1
0.94
0.88
0.84
0.81
NZM...3-ME(SE)220...350(-CNA) (-S1)
E
1
1
1
1
1
1
1
NZM...3-ME(SE)450(-CNA) (-S1)
E
1
1
1
1
1
1
1
NZM...3-ME220...350 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...3-ME450 + XAV
E with XAV
0.96
0.92
0.87
0.83
0.78
0.75
0.73
NZM...4-ME550...875 (-S1)
E
1
1
1
1
1
1
1
NZM...4-ME1400 (-S1)
E
1
1
1
1
1
1
1
NZM...4-ME550...875 + XAV
E with XAV
1
1
1
1
1
1
1
NZM...4-ME1400 + XAV
E with XAV
1
0.98
0.93
0.89
0.85
0.83
0.8
Switch-disconnectors/Molded Case Switch
N1(-4) -63, PN1(-4)-63, NS1-63-NA
1
1
1
1
1
1
1
N1(-4) -100...125, PN1(-4)-100...125, NS1-100...125-NA
1
1
1
1
0.86
0.83
0.8
N1(-4) -160, PN1(-4)-160
1
1
1
0.95
0.9
0.85
0.8
N2(-4) -160...200, PN2(-4)-160...200, NS2-160...200-NA
1
1
1
1
1
1
1
N2(-4) -250, PN2(-4)-200, NS2-250-NA
1
1
1
1
0.9
0.85
0.8
N2(-4) -160...200 + XSV
1
1
1
1
1
1
1
N2(-4) -250, NS2-250-NA
1
0.97
0.92
0.87
0.81
-
-
N3(-4)-400, PN3(-4)-400, NS3-400-NA
1
1
1
1
1
1
1
N3(-4)-630, PN3(-4)-630, NS3-600-NA
1
1
1
0.94
0.89
0.86
0.84
N3(-4)-400 + XAV
1
1
1
1
1
1
1
N3(-4)-630 + XAV
0.96
0.92
0.87
0.83
0.78
0.75
0.73
N4(-4)-630...1250, NS4-800...1200-NA
1
1
1
1
1
1
1
N4(-4)-1600
1
1
1
1
0.87
0.85
0.82
N4(-4)-630...1250 + XAV
1
1
1
1
1
1
1
N4(-4)-1600 + XAV
1
0.98
0.93
0.89
0.85
0.83
0.8
Multi-function component adapters
NZM...3-630...+NZM3-XAD630
with XAD
1
0.96
0.92
0.88
0.84
0.82
0.8
Notes
In determining the maximum permissible current loads at different ambient temperatures,
the derating coefficients listed in the table must be considered.
Example:
An NZM2-A250 should be operated at an ambient air temperature of 65 °C.
How high is the permissible rated operational current I
e
?
At 65 °C the derating coefficient is 0.85, this means I
e
= 250 A x 0.85 = 212.5 A.
The NZM2-A250 may be operated at an ambient temperature of 65 °C with a maximum
I
e
= 212.5 A.
NZM1, NZM2, NZM3, NZM4