Open rails: power supply line (t-busbar): mainly used in very hot halls (such as smelting) and can be produced in two ranges of 600 and 1000 amps.
wampfler type (813 & 812): They are used in polluted environments and need high speed, movement and long path. Which can usually be produced from 100 amps to 1000 amps. Type 812 is for the range of 60 to 300 amps and type 813 is produced in two ranges of 500 and 1000 amps. The cover of this type is pvc bus. And should be used in halls with a temperature of less than 60 degrees.