The Siemens SIRIUS 3RT1916-1EH00 is a surge suppressor with diode assemblies, designed for DC control circuits. It suppresses voltage spikes from contactor coils, protecting the DC control electronics in the panel. The rated DC voltage range is 12 to 250 V, which covers the common 24 VDC control supply as well as higher DC bus voltages found in some industrial installations.
Where it mounts and how it integrates
This surge suppressor is sized for mounting onto SIRIUS contactors in size S00. It clips onto the contactor coil terminals, adding minimal depth to the DIN-rail assembly. The diode-based design means polarity matters — the DC supply must be connected with the correct orientation, or the diode blocks the circuit. For an MRO planner swapping a failed suppressor on a live line, that polarity check is the one step that saves a repeat call.
Lifecycle reality and sourcing posture
The 3RT1916-1EH00 is a phased-out product. The preferred successor is the 3RT2916-1EH00, also a SIRIUS surge suppressor with diode assemblies.