Siemens SIRIUS 3RT1025-1BB40-ZW97 — Power Contactor, Size S0
The Siemens 3RT1025-1BB40-ZW97 is a SIRIUS power contactor in size S0, rated for motor switching at 10 kW at 500 V and 11 kW at 690 V. It carries a 24 VDC coil with a holding power of 5.4 W, and its screw-type terminals accept up to 2x 10 mm² solid or 1x 8 AWG for the main circuit. The contactor mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 50022, fitting a 45 mm wide footprint.
Coordination and Protection
For Type 2 coordination (no damage to the contactor under short circuit), the required upstream fuse is gL/gG 25 A. For Type 1 coordination (contactor may need replacement after fault), the fuse rating rises to gL/gG 63 A. The AC-12 maximum operating current is 10 A, and the contactor is rated for pollution degree 3, suited to industrial environments.
Mounting and Integration
The contactor snaps onto a standard 35 mm DIN rail (DIN EN 50022) or can be screw-mounted. Side-by-side mounting is permitted with a 6 mm clearance at the side. The front face carries IP20 protection; the terminal area is IP00. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2000 m.