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Comet installation and user manual: E-6761200XT/FB
11.6
Merlin Gerin by MGE UPS SYSTEMS
selection of protection devices
Selection of protection devices installed upstream (CB1) or downstream (CB2)
from Comet depends on:
■ the rated line current;
■ the required breaking capacity.
Schematic diagram for protection devices
appendices (cont')
Comet Comet rated Merlin Gerin Merlin Gerin
output (kVA) circuit breaker CB1 circuit breaker CB2
series 11 5 C60N 32A (curve D) C60L ≤ 6A (curve Z)
7.5 C60N 40A (curve D) C60N ≤ 10A (curve B)
10 C60N 63A (curve D) C60N ≤ 10A (curve B)
series 31 5 C60N 25A (curve D) C60L ≤ 6A (curve Z)
7.5 C60N 40A (curve D) C60N ≤ 10A (curve B)
10 C60N 50A (curve D) C60N ≤ 10A (curve B)
15 NC100H 80A (curve D) C60N ≤ 25A (curve B)
20 NC100H 100A (curve D) C60N ≤ 25A (curve B)
series 33 10 C60N 40A (curve D) C60L ≤ 6A (curve Z)
or C60N ≤ 6A (curve B)
15 C60N 40A (curve D) C60L ≤ 6A (curve Z)
or C60N ≤ 5A (curve B)
20 C60N 63A (curve D) C60L ≤ 16A (curve Z)
or C60N ≤ 10A (curve B)
30 NC100H 80A (curve D) C60L ≤ 16A (curve Z)
or C60N ≤ 10A (curve B)
To ensure discrimination during overloads or short-circuits, the following
protection devices are recommended:
LV switchboard
CB1
Comet
CB2
CB2
Note:
The breaking capacity of the protection devices must be greater than the
prospective short-circuit current.
Consult the Merlin Gerin Low Voltage Application Guide for further details.
Selection of the trip units for the circuit breakers installed upstream of the
transformers must take the inrush currents (10 to 14In) into account.