Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
Consumer units - Contactum in particular
I'm looking for a consumer unit to use for the 12 volt DC switchboard
in our boat. While I'm pretty sure *any* MCBs will actually work at 12 volts I'm aiming to use a make which actually specifies that 12 volts is OK. The available makes I have found so far which say 12 volts is OK a- Contactum Square-D Hager MEM Proteus The Electrium family (Wylex, Crabtree, Volex and a lot of wholesaler own-brands) only say down to 24 volts. MK doesn't specify DC at all. So my front runners at the moment are Contactum (very good prices from TLC at the moment) and Square-D (from Toolstation probably). At the moment I'm leaning towards a Contactum metal consumer unit. Does anyone have any recommendations (or otherwise) for any of these brands? -- Chris Green |
#3
Posted to uk.d-i-y
|
|||
|
|||
Consumer units - Contactum in particular
This is 12V, so you need reliable disconnection.
Schneider used to make Merlin-Gerin, Square-D & MK brands. MEM are well regarded. So I would go with whichever is cheapest. Might be worth calling their tech helplines to see if any "application notes" re 12V operation. |
#4
Posted to uk.d-i-y
|
|||
|
|||
Consumer units - Contactum in particular
On Tue, 20 Jul 2010 12:32:59 +0100, tinnews wrote:
I'm looking for a consumer unit to use for the 12 volt DC switchboard in our boat. While I'm pretty sure *any* MCBs will actually work at 12 volts I'm aiming to use a make which actually specifies that 12 volts is OK. The available makes I have found so far which say 12 volts is OK a- Contactum Square-D Hager MEM Proteus The Electrium family (Wylex, Crabtree, Volex and a lot of wholesaler own-brands) only say down to 24 volts. MK doesn't specify DC at all. So my front runners at the moment are Contactum (very good prices from TLC at the moment) and Square-D (from Toolstation probably). At the moment I'm leaning towards a Contactum metal consumer unit. Does anyone have any recommendations (or otherwise) for any of these brands? They specify down to 24 volts because of the contact material. It is designed for mains switching and there may be insufficient voltage below 24v to break through the thin film of oxide that can form on the contacts while open for any extended period of time. Note that if the contacts are closed the oxide film isn't a problem and you can go down to lower voltages. That would normally be the case for a consumer unit. Also, as I mentioned in a previous post, sometimes DC ratings on switchgear are only given *below* 30vDC or 48vDC because the contacts don't open far enough to break a DC arc from an inductive load at much above that! Makes it fun choosing DC switchgear... GE Power Controls do a "proper" range of DC mcbs. EP100UC These are rated down to 12v. ABB S200M are also rated down to 12vAC/DC. There are some mcbs he http://www.techna.biz/en/electrical/...protection.htm that, although they don't give minimum voltage ratings, do show all sorts of information. This includes temperature compensation etc. Not often you find all the curves. I've not used their mcbs on jobs of any size, but they seem to be ok and were reasonably priced IIRC. -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info Filtering everything posted from googlegroups to kill spam. |
#5
Posted to uk.d-i-y
|
|||
|
|||
Consumer units - Contactum in particular
On 2010-07-20 14:42:05 +0100, John Rumm said:
Proteus seem to be gaining popularity and acting as OEMs for a number of other brands, but I have had some rather unpleasant experiences with some of their kit (notably MCBs that only electrically turn on one time in three when you mechanically turn them "on" - that can make fault finding harder than it ought to be!) I have also had problems with Proteus MCBs. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Consumer units | UK diy | |||
Pub discussion over consumer units | UK diy | |||
Consumer Units | UK diy | |||
Consumer units... | UK diy | |||
consumer units in the u.k | UK diy |