Siemens P1A42MC400CT Industrial Lighting Panelboard

Siemens P1A42MC400CT is a 400 A, 42-space, 120/240 V single‑phase panelboard interior from the P1 family, designed as an RP1 unassembled lighting panel for 1P3W service. It is configured as an interior panelboard and provides 42 circuit spaces with a 400 A maximum main rating. The unit is specified for 120/240 VAC operation and is documented as P1A42MC400CT within Siemens’ RP1 UPB lineup, which denotes unassembled panelboard components that are assembled on site with compatible mains and front-fed devices. This configuration is commonly used in commercial and light-industrial installations requiring modular branching and scalable capacity, with 1‑phase, 3‑wire service. As part of Siemens’ P1 panelboard series, the model is designed to accommodate a range of Siemens-compatible main devices and circuit options within the P1 interior family. These interiors are offered as configurable panelboard components that support a variety of circuit-count choices and mounting configurations, making the P1A42MC400CT suitable for projects that require precise space planning and future expansion.