isolator with emergency power off botton

[josemariad2]

Pls can anyone help me with information relating to isolators with emergency power off botton? and how i can get it bcos i urgently need it for a project. thanks

 

[Adam W]

Do you mean where to buy them, how to wire them, or just some background information on what they're about?

 

[josemariad2]

i mean where to buy them and if i can get a picture of how they look like. thanks

 

[Adam W]

Rapid Electronics - Cables & Connectors

 

[telectrix]

you would need to feed isolator through a contactor and use a stop button to break the feed to the coil.

 

[josemariad2]

can i achieve this with three phase mains cable? that is, using the emergency power off stop botton with 4core cable. if yes, how do i do the connection and how many pole contactor should i use?

 

[telectrix]

easiest way to do it would be to buy a DOL starter .

 

[Dunc]

As Tel says, 3 phase DOL (direct on line starter) with 400V coil would do. Is it feeding a motor? If so a overload might be required if one isn't fitted already. Also (if it is a motor) it must be <10kW to be used on a DOL, larger motors must be started via other methods (star-delta starters for example).

 

[josemariad2]

it's feeding a 20KVA UPS.

 

[telectrix]

think we need more info.

 

[josemariad2]

it's like this; a three phase supply needs to feed an isolator with emergency power off botton and the output of the isolator to feed a three phase 20KVA UPS.
The information that i need is how to get an isolator with emergency power off botton bcos i've not seen any isolator that comes with emergency power off botton as a single unit. But from what i've gathered so-far, it's like the emergency power off is a separate unit that has to be connected to the isolator some how to achieve emergency power off by pressing the botton.
my question now is how to connect the emergency power off botton to a contactor to achieve the above. thanks

 

[telectrix]

OK, your DOL starter is operated by a coil which is has a start button to energise it. once energised the coil is held in by an aux. pair of contactors on the side of the main 3 pole contactor. the supply for the coil is fed through a stop button, which when pressed cuts the supply to the coil. and an emergency stop button can be added remotely in series .