Clip-on fastening to the contactor — no DIN-rail footprint consumed, no wiring required beyond the existing coil terminals. The suppressor measures 30 mm wide, 19 mm high, and 12 mm deep, so it stays within the S0 contactor envelope.
This part carries an active lifecycle status from Siemens. For a BOM line that needs a varistor suppressor for S0 contactors, the 3RT2926-1BD00-ZX90 is the current-production choice — no last-time-buy or substitution required. The multi-unit packaging (ZX90 suffix) indicates it ships in a multiple-pack, so one order code covers several panels or a spare kit.