Thread: Contactor sizing?
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27-12-2010 #1
Guys
I'm just doing a single to 3 phase conversion on a lathe and just ordered a 3HP (2.2kw) phase inverter for it. I'm have to redo all the electrics completely and want to add a contactor and mcb fuses (replace the old ceramic bulb type). When i did my mill conversion i changed the motor to a single phase motor and reused the existing contactor without much thought. The question is should i rate the contactor at the fuseable value of the inverter (25amp) or go much higher?
CheersIf the nagging gets really bad......Get a bigger shed:naughty:
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27-12-2010 #2
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27-12-2010 #3
Have a look at the manual here.
https://www.inverterdrive.com/group/...W/default.aspx
This is the unit i have orderedIf the nagging gets really bad......Get a bigger shed:naughty:
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27-12-2010 #4
it actually says 22amp on page 108
If the nagging gets really bad......Get a bigger shed:naughty:
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27-12-2010 #5
When you say contactor, do you mean independently of the MCB, which should be 25A. If so the contactor needs to be rated for 25A switching, not carrying..
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27-12-2010 #6
Yes Irving i do
If the nagging gets really bad......Get a bigger shed:naughty:
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