- Circuit Breaker Locking Device – for Schneider MCCB’s with multiple padlocking facility. Steel construction. Color: Black. ● This device engages in the slot behind the switch toggle, blocking its operation. Adding a padlock prevents unauthorised operation and secures the device in place when the breaker is in the OFF position. ● Number of Locks: 3. Weight: 0.030 Kg. (30 gms)