Warning: Underrated relays used in Marmitek AWM2

Post by **MindBender** » Sun Apr 30, 2006 7:17 pm

Be very careful using heavy loads on the Marmitek AWM2 micro module!

Even though both the technical specification and its housing clearly specify it can handle a load up to 16 Ampere, its internal relay is rated at 'only' 10 Ampere. I wonder what the guys at the NEN think about that... (Actuall, I don't, because I know what they think about that) Has this crap been certified?!

I was already disappointed to find a mechanical relay inside. The advertisement specified a 'silent relay', so I assumed they used a solid state relay. But this mechanical one is not even silent! Yeah, I know; Assumption is the mother of all ****-ups.

[Image failed]

Post by **MindBender** » Wed May 03, 2006 7:04 pm

The Xanura SAIX module suffers from the same problem; It too specifies a maximum current of 10A @ a cosine phi of 1.0. So be careful hooking up your washing machine or dryer on this unit!
A photo of the relay: [img]images/icon_paperclip.gif[/img] relay.JPG 24.4 KB

Post by **Bwired** » Wed May 03, 2006 7:30 pm

Thanks for the tip!

Post by **hopx69** » Thu May 04, 2006 12:04 am

I know that the Xanura modules easily switch all loads upto 16A.

If you take a good look they have a relay (10A)/ Triac circuit(pattented circuit) that allows the module to switch 16A without a problem. The triac switches the peeks , the relay the normal load. The relay contacts will never weld, not even at high peeks.
It is certified, look at the KEMA certification.
Never had one problem with any load

I hope this will make you feel better. Good luck.

Post by **DMB** » Tue Jun 27, 2006 10:07 pm

I agree with hopx69. The peeks are switched with the triac.
See http://www.et-installateur.nl/pdf/TA02_1.pdf?sitemap=
It's in dutch but the diagram and the graphs are clear I think.

I use a SAX1 for switching my washing machine (mostly not on full load) and a SAX1 for a dryer.

DMB

Post by **kockie** » Fri Jun 30, 2006 10:48 pm

I looked at the scheme and text. I just keep asking myself: shat is it good for... A triac is capable of switching large currents, so why still use a relais? Am I missing something?

Post by **MindBender** » Sat Jul 01, 2006 1:19 am

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by kockie
 I looked at the scheme and text. I just keep asking myself: shat is it good for... A triac is capable of switching large currents, so why still use a relais? Am I missing something?
<hr height="1" noshade id="quote"></blockquote id="quote">
1. The relay has a smaller resistance so it will dissapate less heat.
2. The relay is bi-stable, so the unit will 'remember' it's state after power-loss and it requires no energy to keep it switched on.

Post by **Frode** » Fri Nov 24, 2006 8:18 pm

probobly it can easy switch 16A without burning .. but if the relay is marked 10A
it is not suitable to run 16 Amps trough..
10= 2300watts 16= 3600 Watts actually i am wondering if this x10 stuff is realy legal here in Norway.. ohh vell .. if i am going to switch something over 16 A I sure will use a relay thats up to it

ps.. it possibly i am wrong but better to be safe

Post by **Bwired** » Fri Nov 24, 2006 8:55 pm

Reed carefully this topics, 16A is no Problem!
<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Hopx69
 I know that the Xanura modules easily switch all loads up to 16A.
If you take a good look they have a relay (10A)/ Triac circuit(patented circuit) that allows the module to switch 16A without a problem. The triac switches the peeks , the relay the normal load. The relay contacts will never weld, not even at high peeks.
It is certified, look at the KEMA certification. Never had one problem with any load
<hr height="1" noshade id="quote"></blockquote id="quote">

Post by **MindBender** » Sat Nov 25, 2006 7:48 am

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Bwired
 Reed carefully this topics, 16A is no Problem!
<hr height="1" noshade id="quote"></blockquote id="quote">
It is on Marmitek modules: Those don't have the thyristor.