PLEASE NOTE: If you had an account with the previous forum, it has been ported to the new Genetry website!
You will need to reset the password to access the new forum. Click Log In → Forgot Password → enter your username or forum email address → click Email Reset Link.
The form factor starts to become an issue. People like their MCBs and there just isn't enough space inside an MCB to move the contacts far enough apart in order to be able to reliably break a high current 'high' voltage DC supply with a non-polarised MCB. When it comes to those sorts of conditions non-polarised MCBs are usually just ganged polarised MCBs (they have a magnet inside to push the arc into the trap) with the current going the 'wrong' way through one side to ensure that regardless of which way the current is going at the time of fault (or the user flipping the breaker to off) one breaker will always force any arc into the trap and therefore be able to interrupt the current.