Shallco is an American ISO 9001 certified designer and manufacturer of industrial and transportation switch and relay products established in 1967. Our line of Battery switches, disconnects and relays are designed to meet the most demanding applications in the Transportation, Marine and Heavy Equipment industries.  Tested to industry standards for shock, vibration, sealing (IP67, IEC60259, SAE J 1455) life, voltage drop, temperature rise and resistance to fluids and cleaning agents.