Undersink water heater strong enough?

[Polarizing]

12 hours ago, Crossy said:

 

Yes, please turn off the main breaker first.

 

But be aware that there are still live bits inside (they should be finger proof, but TiT).

 

EDIT Poking around in the Siemens catalogue, you need breaker type 5SJ6140-7SC, it's a DIN mount breaker so other manufacturer's units should fit but it's always best to go with a single type.

Any idea where to look for that part? The closest thing i saw was https://th.rs-online.com/web/c/automation-control-gear/circuit-protection-circuit-breakers/mcbs/

not sure about the prices and model! ???? Can help me out please? :))

[Crossy]

It's DIN mount, so if you can't get the Siemens unit (which it seems is now out of production) you could substitute another manufacturer with the same mount (ABB, Chang, Haco and others).

 

The sizes are supposed to be "standard" but the height of the connector tunnel (where the wire goes) varies and since you have a bus bar (solid inter-unit connection) you need this dimension to be reasonably close.

 

Best bet would be to pop out one of the existing units and visit one if the big DIY places. I find our local HomePro has the best range of electrical stuff but we also have a specialist electrical place nearby who can order in from any of the major manufacturers. 

 

Shouldn't cost more then a couple of hundred Baht.

 

 

[sometimewoodworker]

7 hours ago, Crossy said:

The sizes are supposed to be "standard" but the height of the connector tunnel (where the wire goes) varies and since you have a bus bar (solid inter-unit connection) you need this dimension to be reasonably close.

While using the bus bar is ideal, it’s not a big job to either cut it short or bend the connections back out of the way.

[Polarizing]

12 hours ago, Crossy said:

It's DIN mount, so if you can't get the Siemens unit (which it seems is now out of production) you could substitute another manufacturer with the same mount (ABB, Chang, Haco and others).

 

The sizes are supposed to be "standard" but the height of the connector tunnel (where the wire goes) varies and since you have a bus bar (solid inter-unit connection) you need this dimension to be reasonably close.

 

Best bet would be to pop out one of the existing units and visit one if the big DIY places. I find our local HomePro has the best range of electrical stuff but we also have a specialist electrical place nearby who can order in from any of the major manufacturers. 

 

Shouldn't cost more then a couple of hundred Baht.

 

 

so I should look for 1P, 40A, 230/400V AC, 6kA@230, din mount. Or maybe can you point me to the right one here? https://www.homepro.co.th/search?q=breaker I would probably end up asking a staff and they like to confuse themselves if I use english... XD

How to pop a breaker out? Safe to do so if the main is off right?

[Crossy]

With the power off loosen both connector screws all the way out. You should then be able to unclip the breaker from the rail by using a small screwdriver to release the spring loaded catch (it's easier to do than describe).

 

Homepro don't show all their breakers on the website but they do carry Siemens kit, the 40A version of this should fit

https://www.homepro.co.th/p/1113353

 

I think the ABB breakers should be compatible too.

 

Here's a YouTube video, as is usual with these things it makes rather more of a meal than the job really is.

 

 

 

[Polarizing]

https://imgur.com/gallery/i8j8pic
 

@Crossy i am at thaiwatsadu right now and they dont have 40a of the siemens breaker, they do have one of 40a haco. Which one is correct for my purpose. I put a vid and a picture in the link above.

 

someone can check for me please?:))

[Crossy]

The Haco one should fit fine ????

 

[sometimewoodworker]

4 minutes ago, Polarizing said:

https://imgur.com/gallery/i8j8pic
 

@Crossy i am at thaiwatsadu right now and they dont have 40a of the siemens breaker, they do have one of 40a haco. Which one is correct for my purpose. I put a vid and a picture in the link above.

 

someone can check for me please?:))

Looks to be close enough, the bus bar Is usually long enough so the slightly smaller Haco will almost certainly not be a problem. 

[Crossy]

How many other forums offer real-time help whilst a member is in the shop?

 

[bankruatsteve]

4 minutes ago, Crossy said:

How many other forums offer real-time help whilst a member is in the shop?

Hey, there you go!  Real-time chat with Crossy 24/7.

????

[Polarizing]

sorry to bump old thread but went and bought mex cube 6000R, i bought a 40a breaker before, that is too much right? currently there is an c20 in it, that is too less right? is 30a breaker the best? 

[Crossy]

35 minutes ago, Polarizing said:

sorry to bump old thread but went and bought mex cube 6000R, i bought a 40a breaker before, that is too much right? currently there is an c20 in it, that is too less right? is 30a breaker the best? 

 

It really depends upon the cable size, the breaker is there to protect the cable.

6000W is about 27A, OK on 4mm2 and 30A. A 40A breaker would actually be OK on 4mm2 which is rated at 37A or there abouts.

If you have 2.5mm2 cable the max breaker would be 20A.

[bankruatsteve]

40 minutes ago, Polarizing said:

sorry to bump old thread but went and bought mex cube 6000R, i bought a 40a breaker before, that is too much right? currently there is an c20 in it, that is too less right? is 30a breaker the best? 

Google says that will draw 27 amps.  Most important is that you have at least 4mm2 cable to it.  30 amp breaker OK.

 

Edited April 7, 2021 by bankruatsteve