Siemens ECPLD1 is a padlocking device used to lock a breaker in the -"ON"-inch or -"OFF"-position. The breaker will still trip when locked in the -"ON"-position. The padlock is for use on the following Siemens breaker types: double pole QP, triplex or quadplex QT, BL, QAF, QPF, QE, BQ, and BQXD or Murray double pole MP-T, triplex or quadplex MH-T, MP-GT, MP-AT, or MP-ET.