Siemens P2020L1125CU is an electrical panelboard designed for indoor use. It has a maximum short circuit current rating of 100,000 amps RMS symmetrical, at 120/240V~. The actual rating is dependent on the branch breakers installed in the panelboard and the main/feeder breaker, if any, installed ahead of this panelboard. The panelboard can be used as service equipment when a main breaker is installed. It is suitable for use with copper or aluminum wire and has a variety of circuit breaker options available.