Siemens P4040B1200CU is an indoor load center with a maximum short circuit current rating of 100,000 amps RMS symmetrical. It is suitable for use as service equipment when a main breaker is installed and can be converted from a main lug device to a main breaker with the addition of a field-installed main breaker kit. It also comes with a neutral bar and equipment grounding bar, allowing for the termination of equipment grounding wires. Additionally, the load center is invertible for bottom feed applications, providing installation flexibility.