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2x MOT at 5KVA?

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LAN_403

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Fri Feb 27 2009, 07:41AM

Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230

I built a 2 MOT stack last night and decided to go down the unballasted road (TDU does it!). After a few minutes run time my house 20A circuit breakers go. So this to me means my mots are running at 2.5KVA (10Ax 250V) each! Is this normal for a unballasted MOT?

Dr. Dark Current

Fri Feb 27 2009, 10:50AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

A standard unballasted 230V MOT will run 4-6kVA. I think it is a bit less for the 60Hz ones, but still probably 3-5kVA. The reason your breaker tripped after some time is that they have "current inertia" and will pass much higher current for short times, or slightly higher currents for long time.
And I'm sure you didn't load them continuously...

rp181

Fri Feb 27 2009, 01:09PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

If you keep a arc burning, It will trip faster even with 1 MOT. Circuit breakers work by heating, so it takes time for that to heat.

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