Discuss another contactor question sorry in the Electrical Forum area at ElectriciansForums.net

S

super

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hi all thanks for any advice,i am looking into installing a contactor to switch multiple lighting circuits i cant find a design current supply needed to switch the contactor in any documents apart from mA ratings, the norm i always see is 6amps which is what i plan to use at the consumer unit to supply the contactor but why is it always taken as 6amps im sure looking at this contactor it requires mA but do we use 6amp mcbs as these are the smallest in general stock? are contactors designed to take a 6 amp supply to switch them over? im having to do a circuit design for the contactor and looking to start with the Ib rating and failed straight away,so only now asking the question after years of installing a 6amp mcb any knowledge very welcome thanks
 
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snowhead

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Mentor
A control circuit could be in place for a single switch to operate a single contactor, or multiple relays and switches and other input devices to operate multiple contactors.
The control MCB should be selected accordingly.

Most of the Industrial / commercial control circuits I've worked on generally have a 2 or 4 amp control MCB or fuse.
 
K

Knobhead

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  • #3
6A is usually the smallest MCB made by the various board manufacturers, so you choice is a bit limited. Personally I would fit a 2A fuse in your contactor panel for the control.
 
S

super

  • Thread Starter Thread Starter
  • #4
great thank you both for the imput i will go for what you said tony and put in a 2 amp fuse in the contactor panel
 
i think merlin geran do 1amp & 2amp mcbs
 
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Reply to another contactor question sorry in the Electrical Forum area at ElectriciansForums.net

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