Siemens 3rt1015 1kb41 contactor 3kw 400v siemens 3rt1015 1kb41 p the siemens 3rt1015 1kb41 is a 1 no contactor for switching motors it has low power consumption an extended coil voltage tolerance and an integrated surge suppressor for damping opening surges p siemens 3rt1015 1kb41 contactor 3kw 400v