SIEMENS FC901-U3Model FC901 U3 is a complete 50 point system electronics kit comprised of the Model FCM901 U3 main board and the 170W power supply (Model FP2011 U1). The enclosure required for the FC901 system is sold separately. The Model FCM901 U3 main board supports connection to Model FP2011 U1. The 170 Watt power supply (Model FP2011 U1) incorporates a 4. 0A, non resettable slow blow fuse on the primary input, and includes a built in AC line filter for surge and