SIRIUS Configuration Selection data for Fuseless Load Feeders Brochure January 2009 Low-Voltage Controls and Distribution Answers for industry. 6 Introduction. General information. General criteria for the selection of devices. The motor starter protectors, contactors, solid-state switching devices, soft starters and overload relays in the following ta- bles are all specified in their basic versions, i.e. (in particular) without accessories.
Siemens Mpcb Selection Chart Pdf File
Overload currents can occur, for example, when several electrical consumers are used simultaneously in the same circuit and exceed the maximum permissible current level. Short circuits, on the other hand, are conductive connections caused by errors, e.g. between phase and neutral conductor. Short circuits and overload currents can occur quite suddenly, for example, as a result of incorrect operation during switching, assembly errors or cases of higher forces, such as lightning strikes, earthquakes or flood disasters. It’s far more common, however, for them to occur gradually, as a result of age-related faults in cable insulation, plug connections or broken cables.