What this foot switch is and where it lands
The Siemens 3SE2903-1AB20 is a SIRIUS-series momentary-contact foot switch — a single-pedal unit with a metal enclosure rated IP65, meaning it stands up to washdown and dust ingress on a factory floor. It provides 2 normally-open and 2 normally-closed auxiliary contacts, giving four switching paths from one pedal press. The enclosure is metal (black body, grey top part) and accepts a single M20 x 1.5 cable gland, so you run a single cable into the switch body rather than multiple entries. Ambient operating range is -25 to +80 °C, which covers most indoor industrial environments without derating.
Rated currents and what they mean for the circuit
The contact block is rated 6 A at 230 V AC and also 6 A at 400 V AC — the same current rating across both voltage levels, which is typical for a general-purpose auxiliary contact block switching resistive or light inductive loads. At 24 V DC the rating drops to 3 A, and at 250 V DC it falls to 0.25 A, reflecting the DC arc-quenching limits of the contact gap.
Lifecycle and sourcing posture
The product carries a substance prohibitance date of 07/01/2006, which aligns with the EU RoHS compliance timeline. No UL, CSA, or other agency marks are listed in the spec record, so verify local code acceptance if the installation requires third-party certification.