Siemens Low Voltage Molded Case Circuit Breakers Sentron Molded Case Circuit Breakers - Circuit Breaker Enclosures are Circuit Protection Molded Case Circuit Breakers. Sub Brand SENTRON Type JD/LD Features W/ NEUTRAL Std UL F. Rating 50/60Hz Frame JD/LD Enclosure TYPE 4/4X L 45 W 32 H 15 Operating Temperature (-25C --75C) AMBIENT TEMPERATURE Environmental Conditions INDUSTRIAL CORROSIVE RESISTANT