What It Is and What It Does
The Siemens 3RT1025-1AR60 is a SIRIUS power contactor in the S0 frame size, designed for switching motor loads in industrial control panels. It mounts on a 35 mm DIN rail per EN 50022 via screw or snap-on, fitting into the standard 45 mm width slot. Rated operating current at AC-12 duty is 10 A, covering control-circuit loads like PLC outputs and relay coils. For motor switching, it handles 11 kW at 690 V (AC-3) and 7.5 kW at 400 V under AC-2 duty for slip-ring motors. The contactor is rated for pollution degree 3, meaning it's suited for industrial environments with conductive dust or condensation, and operates from -25 °C to +60 °C.
Key Ratings and What They Mean for Your Panel
The AC-4 rating of 15.5 A at 400 V defines the contactor's capability for plugging, inching, or reversing duty — the most demanding thermal cycling. If your application involves frequent motor reversals or jogging, this is the figure that governs contact life, not the AC-3 rating. For Type 2 coordination (no welding under fault), the required upstream fuse is 25 A gL/gG. Type 1 coordination allows a 63 A gL/gG fuse but accepts contact welding. This distinction matters when specifying the branch circuit protection for your panel. Mechanical life is rated at 10 million operations typical, so this contactor is built for high-cycle applications like conveyor sortation or packaging lines where the contactor cycles every few seconds.
Lifecycle and Sourcing
As a SIRIUS S0 frame contactor, it shares the same physical footprint and mounting pattern as other S0 devices in the series. If you're replacing a 3RT1017-1AP01 or similar, the 45 mm width and DIN rail clip are identical, though verify coil voltage and auxiliary configuration against your BOM.