Pactrade Marine Boat RV Battery Selector Switch Rated 300A Intermittent This Battery Switch is rated 175A with continuous duty at 12V and 300A Intermittent. Dimension: 5.2" by 5.2". It is made of Bakelite base with Bakelite knob. Knob Function; Battery 1, Battery 2, Both Battery and Off Wiring Diagram included in box.