MEM 3 PHASE INPUT BREAKER - Resetting

[PETERTHEEATER]

One for Crossy I think.

 

My house has a 3 phase MEM Circuit Breaker at the front end. Model MGR 663 like this one:

 

If I want to isolate power to the domestic circuits I simply push the toggle up to OFF. To restore power I push it down to ON

 

The small blue button to the left of the green ON line is the Press to Trip switch. When pressed the breaker will open and the Switch lever springs to OFF (red line) Presumably, that proves that it will work if overloaded but, if I try to reset it manually the switch toggle will pull down only halfway then baulk as if mechanically blocked. I assume this to be a design feature.

 

Clearly there is something else to do to 'unlock' the toggle after using the Press to Trip. MAybe it just need a hard pull down but I don't want to break it or, maybe, there is a technique?

 

Can you help?

 

Also, The larger Blue 'button' to the left of the Trip button is, I think a sensitivity adjustment but I can't find any info on the web.

 

 

 

 

[bankruatsteve]

Not familiar with this guy, but with other breakers with similar trip condition you have to take it to full off and then it should reset.

 

[Crossy]

17 minutes ago, bankruatsteve said:

Not familiar with this guy, but with other breakers with similar trip condition you have to take it to full off and then it should reset.

 

 

I believe you have to push it "more" than off to reset.

 

A similar unit https://www.google.com.sg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwiv7J2R64XVAhURSo8KHatZDjQQFggoMAE&url=http%3A%2F%2Fwww.eaton.com.co%2Fecm%2Fidcplg%3FIdcService%3DGET_FILE%26allowInterrupt%3D1%26RevisionSelectionMethod%3DLatestReleased%26noSaveAs%3D0%26Rendition%3DPrimary%26dDocName%3DIL01202013E&usg=AFQjCNGTGOf2M4p99A_eu7QBmHIDRjzEdw&cad=rja

 

Look at Figure 9.

 

 

[PETERTHEEATER]

Thanks Crossy. I had to get a local electrician in to 'fix' it and he did so it a few seconds but when I asked him to show me how he just said that you have to pull the toggle down (ON) hard first then relax and immediately push back to ON.

 

I had tried most sensible options myself without luck. Reading the leaflet you have provided I reckon the push to fully OFF first then quickly to ON is most likely. 

 

Looking on-line for this type of breaker I was surprised at how expensive they are!

 

Thanks again.

 

Peter