What it is and what it does
The Siemens 3RT1916-1CE00-ZX90 is a SIRIUS surge suppressor — an RC element rated for 240...400 V AC, designed for direct snap-on mounting onto Size S00 contactors. It suppresses voltage spikes across the coil, protecting the contactor's control circuit and extending contact life in inductive switching applications like motor starters and valve controls.
Mounting and integration
Snap-on mounting onto Size S00 contactors — no tools required. The RC element clips directly onto the coil terminals of the contactor, occupying no additional DIN-rail space. Multi-unit packaging (10 units) suits panel builders stocking spares for a line of S00 contactors.