MNS Low Voltage Switchgear
32Pages

System Guide

MNS is a registered trademark. Product names of other products are registered trademarks of their manufacturers or owners. Technical descriptions relate to MNS 3.0. ABB assumes no responsibility for any errors that may appear in this document. In no event shall ABB be liable for direct, indirect, special, incidental, or consequential damages of any nature or kind arising from the use of this document, nor shall ABB be liable for incidental or consequential damages arising from use of any software or hardware described in this document. This document and parts thereof must not be reproduced...

This guide is intended to be used along with other publications related to MNS Low Voltage Switchgear, such as: MNS Service Manual Erection, Operation and Commissioning Publication no. 1TGC902006M0403 MNS Safety Aspects Publication no. 1TGC900009B0202 Further information on the integrated switchgear platform MNS iS can be obtained from: MNS iS System Guide Publication no. 1TGC910001B0204 MNS Low Voltage Switchgear | System Guide 3

4 System Guide | MNS Low Voltage Switchgear

MNS Switchgear Overview Switchgear Evolution ABB is the global leader for low voltage switchgear with over 1.4 million MNS cubicles delivered worldwide since the inception of this system in 1973. ABB’s history in switchgear can be traced back even further, to the 1890’s when we first manufactured switchgear systems in Sweden. With these credentials it is no surprise that the MNS system is the benchmark for operational safety, reliability and quality. ABB draws on this wealth of background knowl­ dge in e designing and manufacturing low voltage switchgear for its global and local customers....

MNS Switchgear Overview Features & Applications The ABB MNS system is a low voltage switchgear assembly. Its design is verified in accordance with IEC 61439-1/-2. The consistent application of the modular principle both in electrical and mechanical design as well as the use of standardized components allows its flexible and compact design. Depending on operating and environmental conditions different design levels are available. Notable system advantages with regard to design aspects: –– Optimum protection for personnel and plant –– Design verified by testing (type-tested) including arc...

ABB's world wide competence is second to none, this is possible due to the global MNS switchgear platform, and local ABB manufacturing facilities. ABB ensures conformance to IEC 61439-1/-2 throughout, these locations with a proprietary switchgear engineering tool. This tool provides a comprehensive database with predefined engineering solutions for MNS. This database is then utilized with minimal engineering effort to provide customer specific solutions, thus meeting local specifications. Where specific solutions are required on a global basis, these can easily be deployed throughout the...

MNS Switchgear Overview Technical Data Standards Low Voltage Switchgear and Controlgear Assemblies – Verification by testing* Test certificates ASTA, Great-Britain (resist. to accidental arcs acc. to IEC 61641 and IEC 60298, Appendix AA) DLR German Research Institute for Aerospace e. V. Jülich, Earthquake Test for Security Areas in Nuclear Power Stations IABG Industrieanlagen Betriebsgesellschaft, Vibration and shock tests Complying with Germanischer Lloyd, Hamburg Electrical data Rated voltages Rated impulse withstand voltage Uimp Overvoltage category Rated frequency Rated current Rated...

Operational Safety and Availability The fulfillment of all instructions of the relevant standard for Low Voltage switchgear and controlgear assemblies assures a basic level for personal and system protection. With MNS, ABB exceeds these levels as a standard. This has been proven by type tests in accordance with IEC 60439-1 and by design verification by test in accordance with IEC 61439-1 and -2. ABB goes beyond these standards with the proven Safety "Plus" for Operators and Plants and additionally in cases where a high degree of exposure is anticipated, or specific risks (e.g. earthquake...

Switchgear Design Functional Compartments and Segregation The assembly is divided into compartments thus separating different functional areas. Incoming circuit breaker solution Outgoing solution 1 Equipment compartment The equipment compartment is divided into 3 sub sections, each sub section having its own door. 1 Equipment compartment All equipment, including the motor starter modules in withdrawable design, is situated therein. The compartment can be divided into horizontal and vertical* sub compartments. The center sub section accommodates the circuit breaker and associated equipment...

Switchboard Arrangements MNS cubicles can be arranged as follows: free standing, back-to-back or duplex. Switchboard Dimensions MNS cubicles have the following representative dimensions: MNS Low Voltage Switchgear | System Guide 11

Switchgear Design Mechanical Design Frame construction The basic elements of the MNS frame construction are “C” shaped steel profiles with a 25 mm hole pitch according to DIN 43660. This 25 mm equals the dimension of 1E used in MNS to define the area usage within the switchgear. Each cubicle is precision constructed by bolting horizontal and vertical profiles together, to form a rigid modular structure. The assembly is maintenance free as a result of the con­ truction s method utilizing a combination of thread locking ESLOK screws with bolted pressure plates and thread forming screws. The...

Busbar System Main Busbars The MNS main busbar system is arranged in the rear of the switchgear. This assures a maximum distance between the busbars and the operator and maintenance staff. The main busbar system is fully separated from the equipment compartment as well as from the cable compartment. The busbar system is a maintenance free construction as a result of utilizing thread locking ESLOK screws together with conical spring washers. This technology remains relatively unchanged since the introduction of MNS, and has been extensively supplied into the most demanding industries. The...