Sandwich type compact busbar system is a flexible and reliable electrical distribution system with a sandwich construction and superior performance. It is a safe and robust system with high electrical efficiency, low temperature rise, efficient heat dissipation, low voltage drop, high mechanical strength and ease of installation. It is suitable for alternating current three-phase three-wire, three-phase four-wire and three-phase five-wire power supply and distribution system, with the frequency 50~60Hz, rated working voltage up to 690V, rated insulation voltage up to 1000V, and rated working current 100-5000A.