How to make an AC Softstarter because my autotransformer keeps tripping my circuit breaker!

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Parts list (affiliate links):
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In this project video I will show you why my new autotransformer keeps tripping my circuit breaker and how I built an AC softstarter in order to "softly" start the transformer so that it does not trip my circuit breaker. Along the way we will find out how exactly this problem gets created and how you can fix it easily. BTW, such softstarters are also useful for motors ;-) Let's get started!

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Music:
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod
(incompetech.com)

0:00 Showing off the autotransformer
1:04 The problem with the transformer
1:40 Intro
2:13 Functional Principle of an autotransformer
4:27 Finding the problem
5:52 The reason for the problem
7:10 DIY Solution 1 (Simple)
8:15 DIY Solution 2 (Softstarter)
10:33 Final Test & Assembly