A lot of confusion about where and how to use DC Breakers, especially in the South African market. I might be wrong here but would appreciate your feedback and expertise
When it says + or - then that indicates the supply side not the load side. Thats why it's switched from top to bottom as you can feed the supply down the top or up the bottom as long as the supply side polarity matches the diagram shown. Safer solution is to get a 4 chamber/module 2 pole dc isolater (often called a 4 pole isolator) that way you can have the supply side on top or bottom as each pole loops through the breaker twice for fault isolation in either direction. If the fault is on supply side then one of the chambers will extinguish the ark, if the fault is on the load side then the other chamber will extinguish the ark. And the circuit will be broken on both positive and negative.
