This Seachoice Compact Main Battery Switch reliably controls use of electrical power on-board and helps prevent unwanted power draw when the boat is not in use. This switch serves as the main disconnect switch. Once installed, simply turn the easy to use black knob to the OFF position to stop any current flow and ensure that a battery won’t be drained when the boat is idle. Before operating the boat, simply turn the knob to the ON position and you’ll have full access to the battery’s power. This switch is ignition protected and designed for use with systems under 50V - 315A continuous and 450A intermittent. The red plastic housing with a large black plastic knob measures 4 inches x 4 inches x 3 1/8 inches. Its side panels are removable for easy wiring. Seachoice is committed to delivering quality marine accessories and OEM replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. Seachoice is run for and by boaters, offering a wide-ranging product line while remaining affordable. Made in the USA.