Overcurrent Protection By Means Of Line Fuses Or Circuit-Breakers - Siemens SINAMICS S120 Equipment Manual
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- Function manual (1094 pages) ,
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8.2.3
Overcurrent protection by means of line fuses or circuit-breakers
The recommended fuses are used to protect cables and when a fault occurs limit damage to
the power unit. NH, D, and DO-type fuses with a gL characteristic or suitable circuit-breakers
can be used for this purpose.
Note
The devices can be connected to line supplies up to 480 V
of 36 kA symmetrical ("uninfluenced current" acc. to EN 60269-1).
It is not permissible to overdimension fuses as this can result in significant levels of danger
and also faults.
During operation from networks with low short-circuit power (e.g. trial operation, operation
with isolating transformer), the fuses must be designed in such a way that, if a fault occurs,
the line fuses trip after 0.4 s with mobile equipment and after 5 s with stationary equipment
to provide protection against electric shock after indirect contact and in the event of short-
circuits.
Fuses that can operate across the maximum cable length within a circuit must be rated in
accordance with the requirements for:
1. Short circuit protection (IEC 60364-4-43 and -5-52, EN 60204-1, and EN 61800-5-1)
2. The maximum permissible break time for protection against electric shock in the event
3. The maximum permissible voltage drop during operation
that may have an effect with a maximum cable length for the circuits.
The maximum cable length depends on the cable cross-section, material, and insulation, as
well as the type and size of the upstream overcurrent protection device.
The minimum value, which is derived from the three requirements, must generally be
observed. This means that the fuses must be designed in such a way that, if a fault occurs,
the line fuses trip after 0.4 s with mobile equipment and after 5 s with stationary equipment.
The following tables list the requirements regarding line fuses and circuit breakers for the
Active Line Modules, Smart Line Modules, and Basic Line Modules.
Booksize Power Units
Equipment Manual, (GH2), 07/2007, 6SL3097-2AC00-0BP5
WARNING
WARNING
WARNING
of indirect contact (IEC 60364-4-41 and -4–43, IEC 61200-413, EN 61800-5-1, and
EN 60204-1)
Cabinet Design and EMC Booksize
8.2 Selecting devices required to operate SINAMICS
, which can supply a maximum
AC
429
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