Why are fuseboxes called '두꺼비집' - 'toad houses'?

Question

I am having some electrical work done on the house, and learned that a fusebox in Korean is called a '두꺼비집' or 'toad house'. Why is this? It seems like like it should be something to do with the shape or appearance, but I couldn't find any good explanation. I'm not entirely sure what type of fuse, fuse holder, or fusebox is called a '두꺼비집' - I suspect the usage was coined before the modern RCD designs. Any pictures showing what's meant would be great!

Answer 1

I wish I was able to upload the pick of 두꺼비집 ( cover knife switch).

Maybe new ones look different these days but back in old days 두꺼비집 looked just like a toad