What this SIRIUS timer actually is
The Siemens 3RP2540-2BW30 sits in the SIRIUS timer-relay family as a multifunction time-delay module with a relay output and non-volatile parameter retention, so the configured timing program survives a power dip without re-entry at the front dial. The function set explicitly excludes ON-delay, OFF-delay, star-delta, additive ON-delay, pulse-delayed and pulse-shaping modes — this is a multifunction device tuned for two delayed-switching outputs, not a basic on-delay timer.
Timing performance and adjustment range
Adjustable time spans 0.05-600 s on a single continuous scale, with a 250 ms recovery time and a 250 ms minimum ON period — short enough to recover cleanly in sequential start circuits without leaving the output flapping at the end of a time period. Basic insulation is the declared insulation class, and operating temperature spans -25 to +60 °C, with transport and storage rated -40 to +85 °C — so the unit survives cabinet-internal heat soak and outdoor shipping without derating the timing.