Industrial and power supply companies depend on safe production at their factories. High availability of the power grids and protection of the connected consumers are therefore mandatory. The new NXAIR M circuit-breaker panel with HV HRC fuses offers exactly this and is therefore the optimum solution for high standards regarding personal safety, availability, and protection of the consumer loads.

Industrial production lines are often supplied by 24 kV switching substations. These are located close to the produc-tion process and must meet specific requirements. Besides avoiding paint-incompatible substances in the switch-gear, the switching devices must feature a high switching capacity of up to 5,000 operating cycles.

To protect their MV distribution trans-formers and auxiliary transformers, power supply companies frequently use short-circuit protection with current limitation.

The new circuit-breaker panel with HV HRC fuses has been developed for both applications.

As a cost-effective and fast protection element, high-voltage fuses offer the best possible protection of the connected

24 kV, up to 25 kA

consumer loads. With the perfect interaction of the circuit-breaker and the HV HRC fuse, faults can be discon-nected from the grid within a very short time; protection devices and the associated current transformers can be omitted.

The cost-efficient product design with internal arc classification IAC A FLR 25 kA, 1 s, ensures high personal safety, especially since fuse replacement always takes place outside the panel. With the confinement of an internal arc to the respective compartment, the panel exceeds the requirements of the IEC 62271-200 standard.

Compact design, low maintenance, and easy, reliable technology make the NXAIR M circuit-breaker panel with HV HRC fuses an investment that will pay off throughout its entire lifecycle.

Circuit-breaker panel with HV HRC fuses for NXAIR M 24 kV up to 25 kA

siemens.com/nxair

Your benefits

• Saves lives• Saves money• Ensures peace of mind• Increases productivity• Preserves the environment

NXAIR – “Enjoy the Air“Air-Insulated Medium-Voltage Switchgear

Technical features• Factory-assembled, type-tested

switchgear according to IEC 62271-200• Loss of service continuity category LSC 2B• Partition class PM (metallic partition)• Switchgear with internal arc classification

according to IAC A FLR for an arc duration of 1 s

• Confinement of an internal arc to the respective compartment (pressure- resistant partitions), exceeding the requirements of the standard

• Fused circuit-switchers tested according to IEC 62271-107

• All switching operations can only be performed with closed high-voltage door

• Unambiguous position indicators and control elements as standard on the high-voltage door

• Use of maintenance-free vacuum circuit-breakers

• Fuse replacement always possible outside the panel and without tools

• Transformer protection up to max. 2000 kVA resp. 1600 kVA with 1.4-fold overload

Technical data for NXAIR M circuit-breaker panel with HV HRC fuses

Rated values

Rated voltage kV 24

Rated frequency Hz 50/60

Rated short-duration power-frequency withstand voltage kV 50 1)

Rated lightning impulse withstand voltage kV 125

Rated short-circuit breaking current (max.) kA 25

Rated short-time withstand current (3 s) (max.) kA 25

Rated short-circuit making current (max.) kA 63/65

Rated peak withstand current (max.) kA 63/65

Rated normal current of busbar (max.) A 2500

Rated normal current of feeder A 800

Rated normal current of fuse (max.) A 125

Transformer ratings to be protected (max.) kVA 2000

Permissible load current at 40 °C (max.) A 73

Dimension of HV HRC fuse mm 442

Panel width mm 800

Panel height mm 2510

Panel depth mm 16001) GOST standard: 65 kV

HA

25

-27

34

eps

HA

25

-27

35

eps

© 2018 Siemens. Subject to changes and errors. The infor- mation given in this document only contains general descrip-tions and/or performance features which may not always specifically reflect those described, or which may undergo modification in the course of further development of the products. The requested perfor-mance features are binding only when they are expressly agreed upon in the concluded contract.

NXAIR is a registered trademark of Siemens AG. Any unautho-rized use is prohibited. All other designations in this document may represent trademarks whose use by third parties for their own purposes may violate the proprietary rights of the owner.

Siemens AG Energy Management Medium Voltage & Systems Postfach 3240 91050 Erlangen, Germany siemens.com/nxair

Article-No. EMMS-B10125-00-7600 | Printed in Germany | Dispo 30400 | PU 184/004445 PB 08.18 1.0

Basic panel design