Just as an aside there, guys,
Over here in NZ, this very topic is a real sore point with us Electricians.
In that, competitiveness, between the Manufacturers of Switchboards/MCB's, is such that, the one manufacturer, will make thier board to only accept thier range of Breakers, it's all OK, until you go to fit the front panel back on the board, after you have finished the job, and they don't fit!.
They are all DIN Rail mounting, but the front pieces are slightly different in width.
Sure, you can rip the panel out, but why?.