I bought this isolator switch from an auto spares shop, and it seemed to work well until one day when I was removing the fuse it gave an almighty spark!
On closer inspection it turned out that the isolator had failed in the on position.
I drilled out the rivets holding it together and it together and found that the copper switch bar had welded itself closed. There is only a spring to return the bar and no way to tell (mechanically at least) that the switch had failed.
I replaced the switch with one of the same type because I couldn't find anything else locally, and I still have the fuse as a safety cutoff. It might arc while switching and damage the fuse holder but its a surefire way to disconnect the battery in an emergency.
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