What This Contactor Is
The Siemens 3RT2025-1BB44 is a SIRIUS series power contactor in frame size S0, with a 24 V DC coil and screw-type terminals. It is designed for switching loads in control panels, commonly used for motor starting, resistive heating, and DC circuit control.
Lifecycle & Sourcing
The product brand is SIRIUS, and the designation is a power contactor. No auxiliary switch is integrated (: Auxiliary Switch: No), so if auxiliary contacts are needed, a separate block must be added.
Integration Details
Mounts on 35 mm DIN rail per DIN EN 60715 via screw and snap-on fastening. The mounting position allows ±180° rotation on vertical surfaces and ±22.5° tilt forward/backward, giving flexibility in panel layout. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. Depth is 151 mm, width 45 mm, height 85 mm — compact enough for typical control enclosures. Solid or stranded conductors from 1 to 10 mm² are accepted for main contacts; for auxiliary wiring (if using an external block), 2×(0.5 to 1.5 mm²) or 2×(0.75 to 2.5 mm²) can be used. The coil connection uses screw-type terminals.