Electric center accessories work with both Siemens and Murray brands of electrical distribution equipment and helps you get the job done the first time and fast. This accessory is back by a 1-year warranty and is UL listed for all Siemens and Murray breakers. Circuit Breaker Padlock Device locks single-pole QP, MP, QAF and QPF circuit breakers. This padlock is UL listed and ANSI certified for safety.