Telephone: +41 22 02 11 Telefax: +41 22 03 00 E-mail: [email protected] Web: INTERNATIONAL. STANDARD. IEC. Third edition. So how many are aware of the difference between these two Standards? I had these highlighted to me a few years ago and it was news to me. BS EN applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which.

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Difference is in the breaking technology and size. The best way to avert them is tightly worded, highly enforced national regulations.

Just those basic tech specs tell us how different the use of ej breakers defined by our two standards are. Supplementary requirements for circuit-breakers used as direct-on-line starters are given in IECapplicable to low-voltage contactors and starters. StrimaSep 3, Usually these circuit breakers sold by electrical retailers: This site uses cookies. I can say is that mix-ups of standards happen.

With additional requirements for integrally fused circuit-breakers. I would recommend to find the answer by contacting technical support team in the country. Reply Hello Lim, It is higher because of lower Icu breaking capacity ratio to 60974-2 breaking capacity Ics, eg.

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The history of standard IEC may have something to do with it. Click here to find out how to access this document.

Typically IEC certified CBs meet minimally required performance to proof proper protection of household installations: And also a lot of manufacturers have a cross bbs of standards when they produce devices so you really have to look at their documentation. Dear Mostafa, in IEC it is mainly used definition of Icn rated nominal breaking capacity but not Icu ultimate breaking capacity and it makes the difference.

Procurement managers in utilities, too, can get things wrong. Bd those numbers to the V upper limit between phases for residential MCBs. The rating is the same in DC, there is a new magnetic threshold and voltage limitation.

All in all there are so gs interrupting ratings that I am so confused. The same goes for impulse withstand voltage Uimp.

BS EN 60947-2:2017

I am confused with two standards for the same breaker. Consequences can be dire if residential CBs are used instead of industrial ones. It applies whatever the rated currents, the method of construction or the proposed applications of the circuit-breakers may be. Unfortunately I have no answer for the question. IEC requires 4kV, in line with the use for final circuits. Blogger Directory View All Posts. Reply Stephen, the Max Zs value is not always published in technical guides.

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IEC AND IEC a tale of two standards

That notion, combined with lack of knowledge or technical expertise, may have led to the misconception that there is one standard for all CBs. IECwhich I introduced at length in the first of these blog postsgoverns CBs for industrial applications. In order to use AC breaker in DC applications you should follow manufacturer recommendations.

Example of Acti9 circuit breaker 60947- for buildings and industry applications.

These are all written into the Standard so if you are installing MCBs in to areas of a Polution Level 3 then that circuit breaker is not fit for purpose. Kindly let me know if it is available on the Schneider site appreciate if Schneider can up load a youtube video Reply Dear Sumedha, Test procedures are explained in the mentioned standards.

I would really appreciate any help provided.

These CBs are intended for use of indoor, pollution and humidity-free conditions: Hello Lim, It is higher because of 600947-2 Icu breaking capacity ratio to service breaking capacity Ics, eg.

In other words — in final distribution electrical switchboards of buildings which nominal current does not exceed A.