Reece's CB17 is a multi-functional Breaker Lockout that fits most European MCBs and main switches. The CB17 is ideal for use on domestic and industrial applications. Ectra length clearance on the toggle side allows the device to be used on breakers with extra long toggles, as well as the standard size. Thicker main switches are accommodated on the opposite side making this a 2-in-1 device.