TK4V1200SIs a NEMA 1 indoor 600V rated surface mounted enclosure for a General Electric TKM31200 circuit breaker1200A Max. Weighs about 110 lbs. Can mount any TKM circuit breaker and even Spectra Line SKLA series models. This is an alternative to using a safety switch. This option is more expensive, whoever more accessories can be installed in breaker like shunt trip devices, under voltage release or auxiliary switches. This accessories are significant to industry like fueling stations, hospitals or man operated machinery.