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Fuse Systems


Fuses offer optimum protection of lines, systems, devices in case of overload and short-circuit. Fuses ensure safe and fast disconnection, for example, to minimize the effect of a short-circuit, thus allowing you to protect property as well as lives. Siemens offers fuses for all applications, such as line, device, system, and plant protection.

NEOZED Fuse Systems

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Overview

The NEOZED fuse system is primarily used in distribution technology and industrial switchgear assemblies. The system is easy to use and is also approved for domestic installation.

MINIZED switch disconnectors are primarily used in switchgear assemblies and control engineering. They are approved for switching loads and also for safe switching in the event of short circuits. The MINIZED D02 is also suitable for use in the pre-counter area in households in accordance with the recommendations of the VDEW as defined in TAB 2007.

Due to its small footprint, the NEOZED disconnector is primarily used in control engineering. The NEOZED fuse bases are the most cost-effective solution for the application of NEOZED fuses. All NEOZED bases must be fed from the bottom to ensure that the threaded ring is insulated during removal of the fuse link. The terminals of the NEOZED bases are available in different versions and designs to support the various installation methods.

Benefits

MINIZED switch disconnectors:

  • Clear and visible conductor connection that can be easily checked. This facilitates insertion of the conductor and saves time.

  • With draw-out technology for off-circuit replacement of fuses. This provides enhanced safety.

  • The infeed of the devices can be from the top or the bottom. This enables flexible application.

NEOZED fuse disconnectors:

  • With draw-out technology for off-circuit replacement of fuses. This provides enhanced safety.

  • Extremely slim design with a single MW per pole. This saves space and costs.

NEOZED fuse bases made of molded plastic:

  • Clear and visible conductor connection that can be easily checked. This facilitates insertion of the conductor and saves time.

  • Greater safety for personnel thanks to terminals with touchprotection according to BGV A3 at incoming and outgoing feeders. This ensures enhanced safety.

  • Two type ranges with different terminals offer expanded application options.

NEOZED fuse bases made of ceramic:

  • Different terminal versions support a huge range of different installation methods. This ensures greater flexibility.

  • These bases are the most widely used devices for applications with NEOZED fuses. An unrivaled cost-effective solution.



DIAZED Fuse Systems

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Overview

The DIAZED fuse system is one of the oldest fuse systems in the world. It was developed by Siemens as far back as 1906. It is still the standard fuse system in many countries to this day. It is particularly widely used in the harsh environments of industrial applications.

The series is available with rated voltages from 500 to 750 V.

All DIAZED bases must be fed from the bottom to ensure an insulated threaded ring when the fuse link is being removed. Reliable contact of the fuse links is only ensured when used together with DIAZED screw adapters.

The terminals of the DIAZED bases are available in different versions and designs to support the various installation methods.

A key feature is the high-performing EZR bus-mounting system for screw fixing. The busbars, which are particularly suited for bus-mounting bases, have a load capacity of up to 150 A with lateral infeed.

DIAZED stands for " DIAmetral gestuftes Zweiteiliges Sicherungssystem mit EDisongewinde" (diametral two-step fuse system with Edison screw).

Benefits

DIAZED fuse systems area a result of the well-designed modular system, the components can be combined in any way to meet the various requirements and to facilitate different installation methods.



Cylindrical Fuse Systems

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Overview

Cylindrical fuses are standard in Europe. There are a range of different cylindrical fuse links and holders that comply with the standards IEC 60269-1, -2 and -3. They are suitable for use in industrial applications. In South West Europe they are also approved for use in residential buildings.

The cylindrical fuse holders are also approved to UL 512. The cylindrical fuse holders are tested and approved as fuse disconnectors in accordance with the switching device standard IEC 60947-3. They are not suitable for switching loads.

Cylindrical fuse holders can be supplied with or without signal detectors. In the case of devices with signal detectors, a small electronic device with LED is located behind an inspection window in the plug-in module. If the inserted fuse link is tripped, this is indicated by the LED flashing

An auxiliary switch, which can be laterally mounted, enables the forwarding of the switching state of the fuse holder, and thus an integration of the fuses in the automation processes.

Benefits

  • Devices with pole number 1P+N are available in a single modular width. This reduces the footprint by 50 %.

  • The sliding catch for type ranges 8 x 32 mm and 10 x 38 mm enables the removal of individual devices from the assembly.

  • Space for a spare fuse in the plug-in module enables the fast replacement of fuses. This saves time and money and increases plant availability.

  • A flashing LED signals that a fuse link has been tripped. This enables fast detection during runtime.



Class CC Fuse Systems

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Overview

Class CC fuses are used for "branch circuit protection".

The encapsulated fuse holders are tested and designed to the US National Electrical Code NEC 210.20(A) so that in continuous operation only 80 % of the rated current is permitted as operational current.

An operational current of 100 % of the rated current (30 A) is only permitted short-time.

The devices are prepared for the inscription labels of the ALPHA FIX terminal blocks 8WH8 120-7AA15 and 8WH8 120-7XA05.

There are three different series:

  • Characteristic: slow, 3NW1 ...-0HG
    For the protection of control transformers, reactors, inductances. Significantly slower than the minimum requirements of 12 s at 2× In as specified by UL for Class CC fuses.

  • Characteristic: quick 3NW2 ...-0HG
    For a wide range of applications, for the protection of lighting installations, heating, control systems.

  • Characteristic: slow, current-limiting, 3NW3 ...-0HG
    Slow for overloads and quick for short circuits. High current limitation for the protection of motor circuits.

Benefits

  • For switchgear assemblies and mechanical engineers who export their plants. Compliance with the American standard is as follows:

  • Approved according to UL and CSA for typical "branch circuit protection" applications. This facilitates export.

  • Modern design with touch protection to BGV A3 ensures safe installation.



3NA, 3ND LV HRC Fuse Systems

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Overview

LV HRC fuses are used for installation systems in non-residential, commercial and industrial buildings, as well as in the switchboards of power supply companies. They therefore protect essential building parts and installations.

LV HRC fuses are fuse systems designed for operation by skilled personnel. There are no constructional requirements for non-interchangeability of rated current and touch protection.

The components and auxiliary equipment are designed in such a way as to ensure the safe replacement of LV HRC fuses or isolation of systems.

LV HRC fuse links are available in the sizes 000, 00, 0, 1, 2, 3, 4 and 4a.

LV HRC fuse links are available in the following operational classes:

  • gG for cable and line protection

  • aM for the short-circuit protection of switching devices in motor circuits

  • gR or aR for the protection of power semiconductors

  • gS: The new gS operational class combines cable and line protection with semiconductor protection.

LV HRC fuse links are mainly used in LV HRC fuse bases, LV HRC fuse switch disconnectors, LV HRC fuse strips as well as in LV HRC in-line fuse switch disconnectors.

LV HRC signal detectors are used for remote indication that the LV HRC fuse links have been tripped. Three different solutions are available:

  • 3NX1 021 signal detectors with signal detector link 3 The LV HRC signal detectors with signal detector link support monitoring of LV HRC fuse links with non-insulated grip lugs of sizes 000 to 4 at 10 A or more. The signal detector link is connected in parallel to the LV HRC fuse link. In the event of a fault, the LV HRC fuse links are released simultaneously with the LV HRC fuse signaling link. A tripping pin switches a floating microswitch

  • 3NX1 024 signal detector top:
    The signal detector top can be used with LV HRC fuse links, sizes 000, 00, 1 and 2, which are equipped with non-insulated grip lugs and have a front indicator or combination alarm. It is simply plugged into the grip lugs

  • 5TT3 170 fuse monitors:
    If a fuse is tripped, the front indicator springs open and switches a floating microswitch. This solution should not be used for safety-relevant plants. For this purpose, we recommend our electronic fuse monitors.

Benefits

  • LV HRC fuse links with combination alarm signal the tripping of a fuse by a clear color change from red to white. This enables fast identification and replacement of the tripped fuse links. This increases plant availability.

  • The insulated grip lugs made of metal are integrated in the top and bottom covers of the fuse link in molded plastic and provide greater safety when replacing. The mark shown below indicates that the grip lugs are insulated

  • In the standard series with front indicator, the front-mounted red indicator signals the tripping of a fuse.

  • LV HRC fuse links are always equipped with silver-plated contact blades. This means that they are non-corroding and have less contact resistance. This ensures the long-term operational safety of the plant.

  • Uniform solution for all sizes - LV HRC signal detectors reliably indicate when a fuse has tripped. Tripped fuses are quickly located. This saves time and increases plant availability.

  • The LV HRC signal detector top is a cost-effective solution for the monitoring of Siemens LV HRC fuse links of sizes 000, 00, 1 and 2.

  • The silver-plated Lyra contact provides a large contact area for the contact blade of the LV HRC fuse link. This improves heat transmission and lowers the temperature. It also minimizes aging of the fuse link in the maximum load range, in particular when using SITOR fuses The large contact area also facilitates replacement of LV HRC fuse links.

  • The large contact area also facilitates replacement of LV HRC fuse links.

  • The spring washer that tensions the contact is mechanically galvanized. This prevents hydrogen embrittlement. The contact is resistant to aging and there will be no dreaded annealing of contacts, which considerably improves operating safety.