Siemens S5E75ML120ATS Main Lug Panelboard Assembly

Siemens S5E75ML120ATS is a 1200 A main-lug panelboard assembly designed for 480Y/277 V, 3-phase, 4-wire electrical systems. In its MLO configuration, this panel uses field-installed lugs to terminate feeders rather than a built-in main breaker, so upstream overcurrent protection is provided by a separate device. This Siemens panel serves as a distribution point for downstream branch circuits in commercial and light-industrial settings, delivering a compact, code-compliant solution for 480Y/277 V service. The S5E75ML120ATS designation confirms its Siemens lineage and its 1200 A rating for 3P4W service, making it suitable for installations that require robust distribution from a 480Y/277 V source. Typical applications include offices, retail centers, data centers, and manufacturing facilities where reliable, scalable power distribution is needed. As a main-lug only panel, it supports flexible feed configurations and can be combined with appropriate lugs and accessories to tailor the setup to specific installation requirements.