Turn off main breaker first.
Ayuh,..... I Ain't an Electrician, But,......Here are the steps I'm thinking:
Thanks for link. No instructions from anyone, that is why I'm on this forum!Well, the screws on the old breaker are allen wrench drive. Normally you use an Allen socket in a ratchet. Lefty loosey.
That connector is not a thing. It's plainly an integral part of the 200A version of that breaker.
It's also a part of the genuine 150A breaker. Look at that thing, it's exactly what you need! I am now becoming suspicious of your parts source. Where did you acquire this? Did they give you any advice/directions?
Something smells very fishy.
Oh yes, this would be a City Electrical Inspector.Never did find out what kind of inspector this was, did we?