Siemens Fuse System

Siemens Fuse System

Overcurrents in electrical systems occur as a result of overload or due to short-circuits, and can cause serious accidents, fires and financial losses. Corresponding protection equipment has therefore been mandatory since electricity was first used in power engineering. As a pioneer of fuse systems, we offer you the complete range of devices for protecting cables and electrical devices and systems in case of overload and short-circuit.


Safe disconnection

Overload currents can occur in a fault-free electrical circuit if the permissible current loading is exceeded due to an operation or the simultaneous operation of several consumers. Short-circuits on the other hand are conductive connections occurring as the result of a fault, for example between phase and neutral conductor. Short-circuits in electrical systems generally occur suddenly and involve extremely high power which is explosively discharged. In case of overload currents and short-circuits cables can heat up as a result and set fire to installations or entire buildings. International standards and building regulations therefore stipulate suitable measures for protection of electrical equipment against overload and short-circuit – with good reason.  

Fuse systems – versatile in use


Fuses disconnect the circuit safely as soon as an overload or short-circuit occurs. This prevents damage to electrical equipment and reduces downtimes. Specific variants of fuse systems are used for different applications.


aR – Back-up fuse for protection semiconductor components // gG – Full range fuse for general use, primarily cable and line protection // gR – Full range fuses for protecting semiconductor components (faster acting than gS) // gS – Full range fuses for protection semiconductor components, for increased line capacity // gTr – Full range fuse for transformer protection, rated according to apparent transformer power (kVA), not rated current (A)
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