TBLC 25-105 TBLC DIN Rail Power Supply, 5V dc Output Voltage, 4A. The TBLC series DIN Rail mounting power supplies are designed for industrial and residential applications. They are lower cost than the existing TBL range, with similar electrical specifications. Also, they fully comply to the new standby power and efficiency requirements (ECO Standard). They are intended for connecting as Class II devices, so the safety earth connection is not required. They are mountable in flat racks due to their small dimensions in depth.