MNS R Low Voltage Switchgear
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Technical catalogue | July 2016 System Guide

MNS is a registered trademark. Other trademarks and trade names reside with their respective owners. Technical descriptions relate to MNS R. ABB declines all liability 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 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. It is forbidden to reproduce or copy this document or parts thereof without ABB’s...

Intelligent multifunctional relays 14 Power Cables Power Center circuit-breaker modules 22 Motor control center withdrawable modules_23 Foundations for 1400 mm depth cubicles 25 Always close at hand, world-wide_50 Items subject to agreement between manufacturer and the user_52

System Overview MNS® – Since 1975 ABB engineered MNS, the first modular Low Voltage Switchgear, forty years ago. Featuring separated functional areas in conjunction with arc containment, the switchgear was immediately appreciated by the customers. Since then, MNS has become the synonym for personnel and operational safety. MNS R is the rear access version of the MNS family and is designed to guarantee the highest quality and safety standard for all installations that require cable connections at the rear. MNS R provides added value for ABB customers. Low Installation cost A low footprint...

System Overview MNS R main low voltage distribution switchgear with rear access was designed for use in large electrical installations such as those in petrochemical plants, steel works, rolling mills, power stations, oil rigs, ships, etc. The service conditions in these plants are often extremely severe: the high currents involved and effective short-circuit levels require high performance switchgear. In addition, safe conditions for the personnel, service continuity, easy inspection, maintenance, construction and installation must also be guaranteed. Simply installed extensions and...

Technical data Standards and Testing Standards Verification by testing * Test Certificates ABB SACE, ACAE LOVAG, SINAL, Cesi and Ismes Electrical Data Rated voltages Rated insulation voltage Ui Rated operating voltage Ue Rated impulse withstand voltage Uimp Overvoltage category Rated frequency Rated currents Main busbars: Rated current Ie Rated peak withstand current Ipk Rated short-time withstand current Icw Distribution busbars: Rated current Ie Rated peak withstand current Ipk Rated short-time withstand current Icw Arc Proof Tested according IEC 61641 Mechanical Characteristics...

IEC 61439 The new IEC 61439 standard replaces 60439 and applies to enclosures for which the rated voltage is under 1000 V AC (at frequencies not exceeding 1000 Hz) or 1500 V DC. The standard defines design-verified assemblies and completely eliminates categories TTA and PTTA. In order to conform to the standard, type tests have been replaced by design verification, which can be carried out by means of the following three equivalent and alternative methods: testing, calculation/measurement or application of design rules. The following parts are mentioned but are not of equal importance....

Design verification instead of TTA and PTTA categories Design verification replaces type tests, thus discrimination between type-tested assemblies (TTA) and partially typetested assemblies (PTTA) has been eliminated. New types of verifications Three different but equivalent types of requirement verifications have been introduced: Verification by testing (test made on a sample of an assembly or on parts of assemblies to ascertain whether the design meets the appropriate requirements. This method is equivalent to the currently implemented type tests). Verification by calculation/measurement...

Type Tested according IEC 61439 Type Tested In order to guarantee the highest quality and performance standard, MNS R switchgear has been tested according to International Standard IEC61439. The tests simulate situations which occur very rarely or even never in the installations. For example, a short-circuit at the maximum current level for which the installation has been designed is rather unrealistic owing to the presence of current-limiting components (such as the cables) and because the power available is normally less than the rated value. A description of the main tests is given...

Internal Arc Test Safety of personnel who work in the installations has always been a priority for ABB when designing low voltage switchgear. So much so, MNS R switchgear can be also supplied in the arc proof version in compliance with the requirements established by IEC 61641. These requirements are listed below: 1 Properly secured doors, covers, etc., which must not open. 2 Parts of the switchgear and controlgear assembly which may represent a hazard, must be unable to fly off. 3 No holes must form in the freely accessible external parts of the enclosure as a result of paint or stickers...

MINIS R Construction details

Air circuit-breakers Make sure that all the air circuit-breakers are in the vertical mounted withdrawable version to ensure maximum accessibility and reduce downtime during maintenance work. Owing to the unique design of MNS R switchgear, two air circuit-breakers can always be stacked in a single panel. This design ensures the most efficient layout and a reduced footprint. Whatever the size of the breakers and whether power is fed from the top or bottom, is always possible to install two incoming feeders, bus tie and bus riser in only two cubicles. Auxiliary compartment All cubicles have a...

Bus duct connections Rear power cable connection is the main characteristic of MNS R. It guarantees maximun safety and allows switchgear with reduced width to be created. If high rated current is used, a bus duct is often installed instead of the traditional cables. This is a common application for power centers and MNS R has been designed in order to be connected directly to the power bus duct either from the bottom or top. The switchgear busbars are made of copper but can also be connected straight onto an aluminum Bus duct. Multifunctional touchscreen All the switchgears can be...