1P (unipolar) controls 1 route, only controls the positive pole with 1P, and 2P (bipolar) controls 2 routes. If the positive and negative poles are controlled at the same time, 2P is equivalent to two 1PDC Circuit Breaker 12V 24v 48V 96V 500V 120V MCB 100A 125A 160A 200A 250A 300A 400A Solar Cells Protector RV Battery Isolator