What this SIRIUS contactor is and what it does
The Siemens 3RT1025-1AV00 is a SIRIUS power contactor in the S0 frame size, with three normally-open main contacts and no auxiliary contacts built in. It is designed for switching three-phase motors and resistive loads in industrial control panels. Rated for motor duty at 11 kW at 690 V AC-3 and 10 kW at 500 V AC-3, it handles the typical pump, fan, and conveyor loads found in a 400 V to 690 V distribution system. For inching or reversing duty (AC-4), it carries 15.5 A at 400 V, which is the rating that governs contact life under frequent switching. The contactor mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 50022, and its 45 mm width and 91 mm depth fit the standard S0 panel footprint. Front-side protection is IP20, meaning tools and fingers are kept out during operation.
Panel integration and wiring
Main circuit terminals are screw-type, accepting solid conductors from 2x 0.5 mm² up to max. 2x 4 mm², and stranded from 2x 1 mm² up to max. 2x 10 mm². The terminal layout is sized for the S0 frame — expect to land motor leads and line-side feeders within that cross-section range. Side-by-side mounting is permitted with no additional gap, which saves DIN-rail space when ganging multiple contactors for a star-delta or reversing starter. The 6 mm clearance at the side is the minimum for heat dissipation between units. Operating temperature range is -25 °C to +60 °C, with the coil holding at 24 V DC nominal. The pollution degree 3 rating means it is suited for industrial environments with conductive dust or occasional condensation.
Sourcing and lifecycle posture
For a BOM freeze or second-source review, the closest functional peer is the 3RT1017-1AP01, which shares the same S0 frame size and screw-terminal format. The key difference is that the 3RT1017-1AP01 is a lower-rated variant — it tops out at 5.5 kW at 400 V AC-3 versus the 3RT1025-1AV00's 7.5 kW at 400 V AC-3. Verify your motor full-load amps before substituting downward.
Coordination and protection
For Type 1 coordination (no damage to the contactor under short circuit, but may need contact replacement), the required upstream fuse is gL/gG 63 A. For Type 2 coordination (contactor remains fully functional after a fault), the fuse drops to gL/gG 25 A. These values dictate the maximum short-circuit current the contactor can safely interrupt without welding or excessive damage. The contactor is rated for switching at 50 Hz, with the coil operating range at 0.8 to 1.1 times the rated voltage at that frequency. For 60 Hz systems, verify coil compatibility separately — the listed ratings are at 50 Hz.