What this part is and where it lands
The Siemens 3RT2916-1BC00-ZX90 is a varistor-based surge suppressor from the SIRIUS family, designed specifically for size S00 contactors and motor starters. It clips onto the contactor coil terminals to suppress voltage spikes during switching — protecting the coil and the PLC output driving it. The control supply voltage range covers both AC (48-127V at 50/60 Hz) and DC (70-150V), making it a single SKU for mixed-voltage panels.
Physical fit and mounting constraints
At 9mm deep, 28mm wide, and 46mm tall, this suppressor adds negligible depth to the contactor assembly — critical when panel depth is tight. Clip-on fastening means no additional hardware or wiring space needed; it snaps directly onto the S00 contactor coil terminals. Mounting position is unrestricted — the varistor works in any orientation, so it fits horizontal or vertical DIN-rail layouts.
Environmental limits and storage handling
Operating temperature range is -25°C to +60°C, with storage from -40°C to +80°C — adequate for most industrial enclosures without derating. The varistor design absorbs repetitive surge energy; it is rated for AC/DC control circuits, so it handles both line-frequency and DC coil suppression.
Lifecycle and sourcing posture
Sourced through independent distribution channels; availability and current pricing confirmed at RFQ against the BOM quantity.