Siemens S4040L1125 is a load center with a maximum short circuit current rating of 100,000 amps RMS symmetrical. It can be used as service equipment when a main breaker is installed and can accommodate various Siemens circuit breakers for branch protection. The load center is suitable for indoor use and has a Type 1 enclosure. It comes with a hold-down kit for back-fed breakers and can be inverted for bottom feed applications. The S4040L1125 is designed to protect electrical systems from overloads and short circuits, ensuring safe and reliable operation.