What this foot switch carries
The Siemens SIRIUS 3SE2902-0AA20 is a momentary-contact foot switch with a single pedal, no latching, and no interlock — it returns to rest when you lift your foot. The metal enclosure is rated IP65, so it handles washdown and dusty shop-floor environments without a secondary cover. One normally-open and one normally-closed auxiliary contact live inside, wired through a single M20 x 1.5 cable entry. The actuation force is 15 N minimum — a deliberate press, not a brush-by.
Current ratings by control voltage
The contacts are rated 16 A at both 230 V and 400 V AC, 3 A at 24 V, and 0.25 A at 250 V DC. The 16 A figure at 400 V means this switch can directly interrupt a small motor contactor coil or a pilot circuit at line voltage without an interposing relay — useful when the panel is tight on DIN-rail space. Operating temperature spans -25 °C to +80 °C, which covers unheated warehouses and hot machinery enclosures. The enclosure dimensions are 265 mm deep, 156 mm wide, 138 mm high — allow clearance for the M20 gland and the pedal travel when mounting on a machine base or floor plate.
Lifecycle and sourcing reality
No official successor or direct cross-reference exists because the part is current. The SIRIUS family covers a range of foot-switch variants (latching, two-pedal, safety-rated), but this momentary-contact, single-pedal, non-latching configuration is the baseline version for general machine control.