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17/146 Circuit-breakers, switch-disconnectors
Selectivity: incoming circuit-breaker, outgoing circuit-breaker
2010 CA08103002Z-EN
Incoming circuit-breaker
Outgoing circuit-breaker
Selectivity 415 V AC
between circuit-breakers enables separate shut-down of faulty system sections.
Selectivity (discrimination) exists between incoming breaker 1 and outgoing breaker 2 if,
only outgoing breaker 2 trips at position 2 during a short-circuit.
System sections 3 and 4 continue to be operational.
Incoming circuit-breaker (S1)
NZM...1-A... NZM...2-A...
Icu[kA] 25(36)(50)(100) 25(36)(50)(150)
In[A] 20-40 50 63 80 100 125 160 20-40 50 63 80 100 125 160 200 250 300
Outgoing circuit-
breaker (S2)
In
[A]
Icu(415V)
[kA]
Prospective short-circuit current (kA). Set the overload and short-circuit release of the incoming
circuit-breaker to the max. value.
NZM...1-A... 20-40 25-100 – – 0.5 0.7 0.8 1.5 1.5 – – 0.6 0.8 1.5 1.5 1.5 2 3 3
50 25-100 – – – 0.6 0.8 1.5 1.5 – – – 0.8 1.5 1.5 1.5 2 3 3
63 25-100 – – – – 0.8 1.5 1.5 – – – – 1.5 1.5 1.5 2 3 3
80 25-100 – – – – – 1.5 1.5 – – – – – 1.5 1.5 2 3 3
100 25-100 – – – – – – 1.5 – – – – – – 1.5 2 3 3
125 25-100 – – – – – – – – – – – – – – 2 3 3
160 25-100 – – – – – – – – – – – – – – 2 3 3
NZM...2-A... 20-40 25-150 – – 0.5 0.6 0.8 1 1 – – 0.5 0.6 0.8 1 1.2 1.6 2 2
50 25-150 – – – 0.6 0.8 1 1 – – – 0.6 0.8 1 1.2 1.6 2 2
63 25-150 – – – – 0.8 1 1 – – – – 0.8 1 1.2 1.6 2 2
80 25-150 – – – – – 1 1 – – – – – 1 1.2 1.6 2 2
100 25-150 – – – – – – 1 – – – – – – 1.2 1.6 2 2
125 25-150 – – – – – – – – – – – – – – 1.6 2 2
160 25-150 – – – – – – – – – – – – – – – 2 2
200 25-150 – – – – – – – – – – – – – – – – –
250 25-150 – – – – – – – – – – – – – – – – –
300 25-150 – – – – – – – – – – – – – – – – –
NZM...1-M... 40 25-150 – – – – 0.8 1 1 – – – – 0.8 1 1.2 1.6 2 2
50 25-150 – – – – – – 1 – – – – – – 1.2 1.6 2 2
63 25-150 – – – – – – 1 – – – – – – 1.2 1.6 2 2
80 25-150 – – – – – – – – – – – – – – 1.6 2 2
100 25-150 – – – – – – – – – – – – – – – 2 2
NZM...2-M... 20-12 25-150 – – – – – – – – – – – – – – – – –
160 25-150 – – – – – – – – – – – – – – – – –
200 25-150 – – – – – – – – – – – – – – – – –
NZM...2-VE... 100 50-150 – – – – – – – – – – – – – 1.2 1.6 2 2
160 50-150 – – – – – – – – – – – – – – – – –
250 50-150 – – – – – – – – – – – – – – – – –
NZM...2-ME... 90 50-150 – – – – – – – – – – – – – 1.2 1.6 2 2
140 50-150 – – – – – – – – – – – – – – – – –
220 50-150 – – – – – – – – – – – – – – – – –
NZM...3-AE... 250 50-150 – – – – – – – – – – – – – – – – –
320 50-150 – – – – – – – – – – – – – – – – –
400 50-150 – – – – – – – – – – – – – – – – –
500 50-150 – – – – – – – – – – – – – – – – –
630 50-150 – – – – – – – – – – – – – – – – –
NZM…3-VE… 250 50-150 – – – – – – – – – – – – – – – – –
400 50-150 – – – – – – – – – – – – – – – – –
630 50-150 – – – – – – – – – – – – – – – – –
NZM...3-ME... 220 50-150 – – – – – – – – – – – – – – – – –
350 50-150 – – – – – – – – – – – – – – – – –
450 50-150 – – – – – – – – – – – – – – – – –
NZM...4-AE... 630 50-85 – – – – – – – – – – – – – – – – –
800 50-85 – – – – – – – – – – – – – – – – –
1000 50-85 – – – – – – – – – – – – – – – – –
1250 50-85 – – – – – – – – – – – – – – – – –
1600 50-85 – – – – – – – – – – – – – – – – –
NZM…4-VE… 630 50-85 – – – – – – – – – – – – – – – – –
800 50-85 – – – – – – – – – – – – – – – – –
1000 50-85 – – – – – – – – – – – – – – – – –
1250 50-85 – – – – – – – – – – – – – – – – –
1600 50-85 – – – – – – – – – – – – – – – – –
NZM...4-ME... 550 50-85 – – – – – – – – – – – – – – – – –
875 50-85 – – – – – – – – – – – – – – – – –
1400 50-85 – – – – – – – – – – – – – – – – –
Notes T: total selectivity
2
1
3 4
NZM