[Amps] Step start

[Peter Voelpel]

That is one of the reasons that standard solid state relays will not soft
start transformers as they won´t switch on the peak of the sine wave but at
zero volts

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of David Cutter

I have a 240V 15A variac which would consistently blow a 13A plug fuse at
switch on, unloaded.  The spec for these plug fuses states they must blow in
30s with 2.1 x nominal current applied, ie >27A: these always blew
instantly.  Slow blow fuses did not work either.  The variac looks like a
short across the mains until the magnetising current is established.