What the 400-600 V AC range means for your control circuit
The 3RT5936-1CF00 is a Siemens SIRIUS RC surge suppressor designed to mount directly onto contactors in the 3RT series. Its core job is to suppress voltage spikes from the coil when the contactor de-energizes, protecting nearby electronics and extending contact life. The 50 Hz rating is listed as 400-600 V; the 60 Hz rating is the same range but given as 600-400 V in descending order.
Mounting and integration with SIRIUS contactors
This RC suppressor clips onto the contactor coil terminals, typically on the front or side of the contactor depending on the frame size. No additional wiring is needed beyond the existing coil connections — the suppressor bridges the A1-A2 terminals internally. Because it's designed for the SIRIUS contactor family, the mechanical interface is standardized across the 3RT1 and 3RT2 ranges. The snap-on mounting keeps the assembly compact on the DIN rail, preserving panel space for other components.
Sourced through authorized distribution channels, this part is quoted to order against your BOM quantity.