Semiconductor Fuse SITOR, NH Design

 

SITOR, Bauform NH

Overview

SITOR fuses protect power semiconductors from the effects of a short circuit because the super-quick disconnect characteristic is far quicker than that of conventional LV HRC fuses. They protect expensive devices and system components such as converters with fuses in the input and in the DC link, UPS systems and soft starters for motors.

Panel mounting requirements have given rise to various connection versions and designs.

The fuses with blade contacts comply with IEC 60269-2 and are suitable for installation in LV HRC fuse bases, in LV HRC switch disconnectors and in switch disconnectors with fuses. They also include fuses with slotted blade contacts for screw fixing with 110 mm mounting dimension, whose sizes comply with IEC 60269-4.

Fuses with slotted blade contacts for screw fixing with 80 mm or 110 mm mounting dimension are often screwed directly onto busbars for optimum heat dissipation. Even better heat transmission is provided by the compact fuses with M10 or M12 female thread, which are also mounted directly onto busbars.

Bolt-on links with 80 mm mounting dimension are another panel-mounting version for direct busbar mounting.

The fuses for SITOR thyristor sets, railway rectifiers or electrolysis systems were developed specially for these applications.

To find out which LV HRC fuse bases and safety switching devices can be used with the SITOR fuses, please refer to the chapter "Low-voltage fuse systems".

The characteristic curves for the configuration and assignment of SITOR fuses to fuse bases and 3NP and 3KL safety switching devices can be found in the Catalog ET B1 Add-On Characteristic Curves and on the Internet.

The new size 3 type ranges have a round ceramic body instead of a square one. Key features of these type ranges are small I²t values with low power dissipation and a high alternating load capability. The dimensions and the functional dimensions comply with the current standards IEC 60269-4/EN 60269-4 (VDE 0636-4).

 
Benefits

  • SITOR fuses have a high varying load factor, which ensures a high level of operating safety and plant availability – even when subject to constant load change.

  • The use of SITOR fuses in LV HRC bases or Siemens switch disconnectors has been tested with regard to heat dissipation and maximum current loading. This makes planning and dimensioning easier and prevents consequential damage.

  • Our high standard of quality ensures good compliance with the characteristic curve and accuracy. This ensures long-term protection of devices.



Operational classes
Fuses are categorized according to function and operational classes. SITOR semiconductor fuses, in LV HRC design, are available in the following operational classes: 

  • aR: for the short-circuit protection of power semiconductors (partial range protection)

  • gR: for the protection of power semiconductors (full range protection)

  • gS: The gS operational class combines cable and line protection with semiconductor protection (full range protection).