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        7. Fuse systems

        Fuse systems

        Mandatory basic protection in electrical installations

        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.

        Find the right fuse system

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        NEOZED Fuse System

        NEOZED Fuse System

        • Application mainly in distribution board technology, in industrial switchgear and in control engineering
        • User-friendly system, approved for domestic installation

        DIAZED Fuse System

        DIAZED Fuse System

        • Well coordinated system of components for flexible combinations tailored to meet your requirements
        • Application as standard fuse system in numerous countries
        • Various different series with rated voltages from 500 to 750 V

        Cylindrical Fuse Systems

        Cylindrical Fuse Systems

        • Standardized cylindrical fuse links and holders in accordance with IEC 60269-1 and -2
        • Use in industrial applications 
        • Approval of cylindrical fuse holders according to UL 512

        LV HRC Fuse System

        LV HRC Fuse System

        • Applications in installation boards and switchboards in infrastructure and industrial applications
        • Use in distribution systems of power supply companies
        • LV HRC fuse link can be used in switch connectors with fuses and fuse switch disconnectors

        UL Fuse Systems (Class CC and Class J)

        UL Fuse Systems (Class CC and Class J)

        • Export facilitated thanks to UL and CSA approval
        • Class CC fuses: Application for branch circuit protection
        • Class J fuses: Application for branch circuit protection and in the feeder circuit

        SITOR Semiconductor Fuses

        SITOR Semiconductor Fuses

        • Short-circuit protection for power semiconductors
        • Ultra-fast disconnection characteristics compared to conventional LV HRC fuses 
        • Protection of valuable devices and system components, for example converters with fuses in the input and in the DC intermediate circuit, UPS systems and soft starters for motors

        Photovoltaic Fuses

        Photovoltaic Fuses

        • Protection of the modules and module connection cables in the event of reverse currents
        • Safe disconnection in case of fault currents reduces the risk of fire due to DC electric arcs
        • Safe isolation when the fuse holder / fuse base is open
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        Short-circuit and overload protection

        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)
        Cable and line protection

        One of the most common application areas for fuse systems is protecting cables and lines against overheating. Utilization category gG has been standardized for this. Fuses with utilization category gG are matched in their time/current characteristics to the maximum permissible load of insulated cables. gG fuses also protect electrical systems and devices and can be employed for backup protection of components such as residual current circuit-breakers, miniature circuit-breakers and molded case circuit breakers.
        Switchgear protection in motor circuits

        Fuses have proven themselves as particularly economical and reliable short-circuit protection equipment in motor circuits. Compared with other protection devices, fuses have considerably lower cut-off currents and values. As a result, there is hardly a more affordable method of providing short-circuit protection in accordance with VDE 0660 coordination “2”.
        Semiconductor protection

        Fuses of different utilization categories and technical parameters are employed for the protection of semiconductors, depending on the place of installation and required degree of protection for the power semiconductor used (diodes, thyristors, GTOs, IGBTs, etc.): Partial range fuses of utilization category aR provide protection against short-circuits, and full range fuses gR and gS against overload as well. Fuses of utilization category gS additionally fulfill the requirements for protecting leads and cables in case of overload, in other words they combine semiconductor and cable protection.

        Protection of renewable energy systems

        Particular risks to photovoltaic systems are so-called reverse currents, which can occur in the event of faulty solar modules. Among other measures, special fuses with full range characteristic gPV designed to meet the characteristic requirements of photovoltaic systems are needed to protect such systems. The same applies for wind power plants. In this case, gG fuses are generally used for which, however, separate tests must be conducted to verify conformance with the special requirements (e.g. higher network voltage tolerance).

        All details relating to fuse systems

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        Play it safe

        Reliable protection for personnel, assets and plants can be guaranteed with an intelligent, end-to-end protection concept for the entire electrical installation. We assist you with the fast, simple implementation of standard-compliant solutions offering all-round security in line with your requirements and throughout your entire value added process. Find out more!

        Renewable energies

        We offer a wide variety of solutions, systems and products for the generation and utilization of electricity from renewable energy sources such as wind and sun. Find out more!

        Switching electrical systems

        Switch disconnectors with 3KF fuses provide protection against overload and short-circuits in their capacity as main and EMERGENCY_OFF switches for switch boards, power distribution boards, and power supply and motor feeders. They can also be used in combination with SITOR semiconductor fuses in UPS systems, frequency converters and capacitor control systems.

        Play it safe – SENTRON protection devices for modern electrical installation

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        Ordering fuse systems

        Basic protection against short-circuit and overload

        Fuse systems are a permanently established element of power distribution systems for applications in infrastructure, buildings or industry. They provide fundamental protection in a wide range of different fields of application and disconnect reliably in the event of short-circuit or overload. Be sure to explore our portfolio.

        Find the suitable fuse system for your needs

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