The fully wired reversing contactor assemblies are suitable for use in any climate. They are finger-safe according to EN61140. The contactor assemblies size S00 and S0 each consist of 2 contactors with the same power, with one NC contact (S00) or one NO contact and one NC contact (S0) in the basic unit. the contactors are mechanically and electrically interlocked (NC contact interlock). The 3RA23 contactor assemblies have screw terminals (main and control circuits) and are suitable for screwing or snapping onto TH 35 standard mounting rails.