Information On The Disconnector Unit; Overcurrent Protection By Means Of Line Fuses And Circuit Breakers; Power Modules, Blocksize Format - Siemens SINAMICS S120 Equipment Manual

4.2

Information on the disconnector unit

A line disconnector is required for disconnecting the drive line-up from the supply system.
This must be selected in compliance with local regulations.
The accessories required for the line disconnector must be selected from the manufacturer
catalogs.
NOTICE
Damage to the drive electronics when switching the line disconnection equipment under
load
When switching the line disconnection equipment (type according to the recommended
selection) under load, then the contacts will be subject to premature wear. This can cause
the line disconnection equipment to malfunction, with subsequent damage to the drive
electronics.
• Use a leading, opening auxiliary contact.
• If this is not possible, then avoid switching the line disconnection equipment under load.
4.3

Overcurrent protection by means of line fuses and circuit breakers

Electric shock or fire due to overcurrent protective equipment that trips too late or not at all
Overcurrent protective equipment that trips too late or not all can cause electric shock or
fire.
• In the case of a conductor-conductor or conductor-ground short-circuit, ensure that the
• You must additionally use a residual-current protective device (RCD) if, for a conductor-
• The short-circuit current must not exceed the SCCR of the converter and the breaking
4.3.1

Power Modules, blocksize format

The Power Modules are suitable for a rated short-circuit current (SCCR) up to 100 kA. You
must use line fuses or circuit breakers for overcurrent protection. The following protective
elements can result in reductions.
Detailed information on the protective devices is provided in the product information
"Protective devices for Power Modules PM240-2
(https://support.industry.siemens.com/cs/de/de/view/109486009)".
AC Drive
Manual, 06/2019, 6SL3097-5AL00-0BP1
WARNING
short-circuit current at the point where the converter is connected to the line supply
corresponds as a minimum to the requirements of the protective equipment used.
ground short circuit, the required short-circuit current is not reached. The required short-
circuit current can be too low, especially for TT line supply systems.
capacity of the protective equipment.
Mains connection and line-side power components
4.2 Information on the disconnector unit
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