Locking element for NG125. In the ON or OFF position of the NG125 1-pole and 2-pole circuit breaker. In the ON position of the NG125 3-pole and 4-pole circuit breaker. This locks the circuit breaker in the open or closed position. However, thanks to the trip-free function, the circuit breaker also trips in the locked ON position. Provision for a padlock available. Diameter of the locking element - max. 8 mm.