Diode-based DC surge suppressor, 30...250 V
The Siemens 3RT5936-1TS00 is a SIRIUS surge suppressor built with diode assemblies, designed exclusively for DC control circuits. It covers a 30...250 V DC range, making it a fit for suppressing coil-induced voltage spikes across contactors and relays in a DC control loop.
What the DC-only rating means on the panel
This suppressor is specified for DC control supply voltage only. The diode assembly clips the reverse voltage spike when the coil de-energises, protecting PLC outputs and upstream contacts. The 30...250 V DC window covers standard 24 V DC control loops with headroom for 48 V and 125 V DC circuits found in utility and rail applications.