Small Din Rail Single Phase DB Mounted Transfer Switch

netorius77

netorius77

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HELP!:confused:

Somewhere in this Forum, I read a thread where someone recommended a small single phase Din rail mounted Transfer Switch (I am pretty sure it was a Schneider product). For the life of me, I now cannot find it. I am looking at my generator project and this was perfect.

Anyone?
 
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gfmalan

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I'll be using a contacter, that way you can even have a remote trigger to switch.

http://www.saipwell.com/goods/show-2535.html

I find allot of such devices, but all chinese junk, or really expensive stuff that come with generators.

I would visit one of these suppliers and buy something availablle in SA, if you are in Pretoria, i know 6 places that would sell stuff like that (electrical LV suppliers)

I'll buy 2 CBi contactors, and a 2 way light switch to control them. Cheapest smallest option
 
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netorius77

netorius77

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dillinger

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When fitting a change over switch you must rate it to the highest supply, if your Mains isolator is 60 Ampere and the Generator is 20 Ampere then you must fit a 60 Ampere switch, if you dont the change over will burn out eventually.

Switchgear comes with different ampere categories, usually some AC number behind the ampere rating, AC1, AC3, AC22, AC23. I wont got into details as to what every one of them means and how its worked out. Think of AC1 like PMPO Watts in a sound system and AC3 its like RMS Watts in a sound system.

I have seen DIN change over switches rated at 100 Ampere, a bit of common sense and you can work out that such a small switch cant do 100 Ampere, first clue is that you cant even get 35mm cable into the switch, what is needed for 100 Ampere. Looking closer at the switch you will see the 100 Ampere is rated at AC1 and not AC3 or AC23, look for the Kw raring that will give you a indication as well what the switch can actually do. I came across a change over switched with 1250 Ampere written all over it, but when looking closer at the Kw rating the switch is only good for 800 Ampere actually.
 
netorius77

netorius77

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dillinger said:
When fitting a change over switch you must rate it to the highest supply.
Click to expand...
Thanks dillinger. Good advice. I still wish I could find the thread of the Transfer/changeover switch someone else had installed - no idea of the rating though, but didn't look like it was more than ~30A.

Something like this is pretty neat and compact - available in 25A and 40A: http://www.havells.com/Product.aspx?s=19 Not sure who makes somethng similar in SA
Changeover-DP.png
 
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dillinger

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I have got Havells lying around some where, they are 4 Pole 40 Amp if I'm not mistaken, all you do is bridge them out, double up the poles, and then they should be good for 60 Ampere
 
netorius77

netorius77

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Digging some more I found this available from Electromechanica.

A Hager 40A 2 way Centre off Changeover that is only 2 modules wide. Suits my need... I have a 3 phase DB at home so will use this on one phase and allocate all my emergency circuits onto one phase.

Hager SFT240 small.jpg
 
Sonic2k

Sonic2k

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ACDC Dynamics also sells them.
They sell the 100A version which was in the region of R220. Works the charm.
 
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