LAY5(XB2) series pushbutton switch is suitable for using in power system with AC 50 or 60 Hz, voltage up to 660v and DC voltage up to 440v, in main magnetic starter... Specificatin: XB2-BA21,31,42,51,61,25,35,45 XB2-BC21,31,42,51 XB2-BR21,31,42,51 XB2-BS442,542,642,142 XB2-BD21,25,33,41,45,53 XB2-BJ21,25,33,41,45,53 XB2-BG21,25,03,33,41,61,53 XB2-BT42,845 XB2-BW3361,3461,3561,3661,3371,3471, 3571,3671,3141,3341,3441,3541, 3151,3351,3451,3551