PSE200U
SIEMENS SITOP PSE200U selectivity module distributes the load current across several 24 V DC load circuits and monitors them reliably for overload and short-circuit conditions. The electronics permit brief current peaks caused, for example, by high inrush currents, but isolate 24 VDC load circuits in the event of an extended overload. This is ensured even on high-resistance lines and in the case of "creeping" short-circuits. In such cases, miniature circuit breakers fail to trip, or trip too late, even if the power supply unit could deliver the required tripping current. The SITOP PSE200U continues to supply 24VDC to the load circuits not affected by an overload - a feature which avoids a possible total system failure. The single-channel message version facilitates rapid, channel-specific fault localization via just one digital input at the PLC.
