The Siemens 3RT6916-1CB00 is a SIRIUS surge suppressor with RC elements, designed specifically for S00-size motor contactors and contactor relays. Its 9 mm depth and 28 mm width let it clip onto the same DIN rail as the contactor without stealing panel space — critical when you're stacking multiple contactors in a row and every millimeter of rail length is already allocated. The RC coupling snubs the inductive kick from the coil each time the contactor drops out; without it, that voltage spike eats into the PLC output card's life or causes nuisance resets on the safety relay. The control supply voltage range covers 24...48 V AC at 50 Hz and 48...24 V AC at 60 Hz — note the reversed order at 60 Hz, which is the manufacturer's own spec — plus 24...70 V DC. That means one part number handles both 24 V and 48 V control schemes, AC or DC, without a coil-voltage variant swap. The AC/DC type-of-voltage designation confirms the suppressor works across both supply families, so you don't need to track separate AC and DC part numbers on the BOM.
Deployment context
The S00 contactor footprint is the most compact in the SIRIUS family — this suppressor matches that footprint, so it sits directly on top of the contactor's coil terminals. For a panel-builder, that means no flying leads or separate terminal-block landing: the suppressor bridges the coil terminals with its RC network, and the control wires land on the suppressor's own terminals.