Blue Sea System M Series Battery Switch - Dual Circuit & Dual Circuit Plus 300 Amps continuous rated battery switches for simultaneously switching two isolated battery banks or circuits BS-6010- Simultaneously switches two isolated battery banks or circuits. May be used to switch the positive and negative conductors for required applications BS-6011(B)- Simultaneously switches two isolated battery banks or combines battery banks to all loads. CAN NOT be used to switch and positive conductors due to its combine feature.