Define the part before you size the panel slot
The Siemens 3RP1533-1AQ30 is a SIRIUS time delay relay in the 22.5 mm DIN-rail housing class, and its job is to hold an output contact for a programmed interval after the control signal drops — the OFF-delay function, not an ON-delay or pulse-shaping variant.
Timing range and what the dial actually does
The adjustable time window runs 5... 100 s, with a minimum ON period of 35 ms and a recovery time of 150 ms — the recovery figure is the dead time the relay needs between cycles before it will retrigger cleanly, which matters when the upstream contact is a sensor pulse rather than a maintained pushbutton. Initial-value 0.85 and full-scale 1.1 describe the trim band around the setpoint the installer dials in; one delayed switching contact is the output (Delayed Switching 1), with no additive ON-delay, no pulse delay, and no star-delta mode on this variant.
Mounting, wiring, and the panel footprint
Housing dimensions are 22.5 mm wide by 102 mm tall by 91 mm deep, which is the standard SIRIUS 22.5 mm slice and lands cleanly in a row alongside motor contactors and other 22.5 mm timing or monitoring modules. Solid or stranded wire from 20... 14 AWG lands in the screw terminals; clearance distances around the device are 0 mm on every face, so adjacent DIN-rail devices can be butted up to it on the rail. Operating envelope is -25... +60 °C, with transport and storage rated -40... +85 °C, and basic insulation throughout — no reinforced or double insulation is claimed on this variant.