Toroids have a higher inrush because they form a more efficient magnetic
circuit.  The hystereis loop for a toroid is very square.  I have used some
120VAC/200A toroids and measured inrush currents of more than 1600A.

Ryan Haley
ASP CORP.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Peter L. Peres
Sent: Wednesday, October 23, 2002 12:53 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Using two SCRs to turn power transformer on/off


*>I wouldn't be using a 25amp relay to switch a
*>23A inductive load. AND toroid mains transformers
*>also have larger inrush currents than the older
*>laminated EI core types, at least based on the
*>couple i'm using here. :o)

Why would a toroidal transformer have a higher inrush current than a usual
EI cored one ? Of course you know what a coil does when you suddenly put a
voltage across it.

Peter

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