Designed for single-phase connection, the Sitop PSU100L from Siemens Industry Automation offers all important functionalities at an attractive price/performance ratio. Delivering a controlled 24 V, it is available in three performance classes with rated currents of 2.5, 5 and 10 A. Power supplies of the same type can be connected in parallel for increased performance. The product range has been designed primarily for use in machines and plants whose automation components have a reliably supplied with 24 V but only have basic demands with regard to the scope of functions provided by the power supply. Their wide-range input with manual switchover supports connection to all industrial supply systems. The primary switched-mode regulators occupy little space on the DIN rail due to their small widths of 32.5, 50, and 70 mm. Fan-free, they can be operated at 0 to 60 °C ambient temperatures and have up to 89% efficiency. Thus, they use little energy and produce small amounts of dissipated heat in the control cabinet. The operating state “24VDC ok” is signaled on an LED. Electronic short-circuit and overload protection are standard. For use in North America, the power supplies have been granted approvals in accordance with CE and cULus.