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Topic Title: Wylex Bs3871 Type 2 B16 MCB
Topic Summary: What does the B in B16 represent
Created On: 06 June 2009 09:00 PM
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 06 June 2009 09:00 PM
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interplay

Posts: 178
Joined: 19 February 2005

Hi all,
I came across some old plug in Wylex MCBs today that state on the side BS3871 Type 2 and on the front B16.
Could anyone explain what the B represents in "B16"
I know it is not a B Type breaker but dont have a clue what the B represents?

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cheers, Interplay
 06 June 2009 09:41 PM
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spinlondon

Posts: 4412
Joined: 10 December 2004

The B indicates that it is a B type breaker.
 06 June 2009 10:06 PM
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interplay

Posts: 178
Joined: 19 February 2005

spinlondon, the B does not mean it is a B type breaker, it is a BS3871 Type 2 breaker!

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cheers, Interplay
 06 June 2009 10:22 PM
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michaelbrett

Posts: 920
Joined: 28 December 2005

If you refer to the old Wylex data sheet, the plug in MCBs were known as B Breakers. These were the original push-button type.

I can only presume that this was a genric catalogue reference that had additional characters to indicate rating etc.

Regards

Mike
 06 June 2009 10:38 PM
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spinlondon

Posts: 4412
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A new standard for MCBs came into play on 01/07/1994.
The standard changed from BS3871 to BS EN60898.
Manufacturers were allowed to continue production at the old standard untill 30/06/1999.
For those 5 years, the MCBs could be made to either or both standards.
The trip times of the MCBs are different, and they sometimes overlap.
Type B equates to Type1/2.
Type C equates to Type2/3.
Type D equates to Type 4.

I hope this helps.
 07 June 2009 05:49 PM
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interplay

Posts: 178
Joined: 19 February 2005

Thanks for the info, it was just something that started to get me wondering.

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cheers, Interplay
 07 June 2009 06:20 PM
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napitprofessional

Posts: 347
Joined: 08 March 2008

Originally posted by: spinlondon

A new standard for MCBs came into play on 01/07/1994.

The standard changed from BS3871 to BS EN60898.

Manufacturers were allowed to continue production at the old standard untill 30/06/1999.

For those 5 years, the MCBs could be made to either or both standards.

The trip times of the MCBs are different, and they sometimes overlap.

Type B equates to Type1/2.

Type C equates to Type2/3.

Type D equates to Type 4.



I hope this helps.




The characteristic curves for Types B,C and D are very different to Types 1,2,3 and 4 hence the max efli to meet disconnection times is sometimes radically different - have a look at a Type B versus a Type 1!
 08 June 2009 01:28 PM
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AJJewsbury

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The characteristic curves for Types B,C and D are very different to Types 1,2,3 and 4 hence the max efli to meet disconnection times is sometimes radically different - have a look at a Type B versus a Type 1!

MCBs have a range of acceptable characteristics - the BS 7671 appendix 3 graphs only show the 'slowest' edge of these ranges. Have a look at manufacturer's data to see the whole picture (e.g. page TD263 of http://www.mkelectric.co.uk/PD...hnical/SENTRY_tech.pdf ) It is possible to manufacture a device whose characteristics fall within the overlap of two ranges - i.e. guaranteed to trip within the lower EFLI.
- Andy.
 08 June 2009 01:37 PM
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OMS

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If I recall correctly, BS 3871 included Types 1 through 4 and Types B, C and D - as Andy points out, many circuit breakers met a whole range of characteristic types between the leading edge and trailing edge curves.

Regards

OMS

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