Siemens Low Voltage Molded Case Circuit Breakers Sentron Molded Case Circuit Breakers - Circuit Breaker Enclosures are Circuit Protection Molded Case Circuit Breakers. Sub Brand G FRAME Features SHUNT TRIP Std UL F. Rating 50/60Hz Enclosure TYPE 1S L 21.4 W 10.3 H 5.9 Operating Temperature (-25C -- 75C) AMBIENT TEMPERATURE Environmental Conditions INDOOR