The Siemens 3RW4026-1TB04 is a SIRIUS soft starter in the compact Size S0 frame, rated 25 A at 40 °C for standard motor starting on 50/60 Hz lines. The integrated bypass contact system means you don't need a separate bypass contactor — the soft starter handles both ramp-up and running, saving panel space and wiring.
Derate to 23 A at 50 °C and 21 A at 60 °C, so a warm cabinet eats into headroom. The 600 V insulation voltage covers 480 V systems with margin, and the 50/60 Hz operating frequency means one part works globally. Minimum load is 20 % of the rated current, so it won't start a motor that's too small for the unit — keep that in mind if you're paralleling small motors.
Where it lives in the panel
Size S0 means a 45 mm wide footprint on the DIN rail, 125 mm tall, 155 mm deep. Clearance: 60 mm above, 40 mm below, 15 mm at the sides. The screw-type terminals on the main circuit accept 2x (0.5... 2.5 mm²) solid or stranded, and the auxiliary/control circuit uses the same screw terminals. Wire length to the motor can run up to 300 m, which covers most plant floor runs. Mounting position is flexible: with the optional fan you can rotate the unit ±90° and tilt ±22.5° front-to-back; without the fan, rotation is limited to ±10°. That matters when you're squeezing it into a tight corner of a panel.