2 ways, 4 ways, 6 ways, 12 ways, 18 ways, 24 ways, 36 ways Combination ... as over current, overload and short circuit protection and frequency switch under the rated working state. 1 line, 2 lines, 4 ... lines, 6 lines, 8 lines, 12 lines, 15lines,18 lines, 24 lines ...