[C320-list] Replacing circuit breaker in main panel

[Tim]

Seems I have a faulty circuit breaker in my main panel. It will not stay on even without any of the switches on or drawing current. Not an electrician but this tells me the breaker is at fault and not one of the circuits. So, does anyone know how to get these out and replace them? Looks like it's siliconed in but it does rotate and I'm not sure how to remove. Any words of wisdom?
 
Thanks,
Tim O'Mara
Calypso #603