TeSys mechanical interlock for TeSys control - Giga power contactors with identical contactor design. For use with a mutual interlock of power contactors such as with mains switching, motor starters with 2 directions of rotation or star delta circuits. The interlock is snapped in between the contactors and prevents both contactors from switching at the same time. The switched on contactor blocks the switching on process of the 2nd contactor. Green Premium compliant (RoHs/Reach).