Star-delta contactor assembly — supplied contactors and power rating
The Siemens 3RA2435-8XF32-1AG2 is a SIRIUS star-delta (wye-delta) contactor assembly, factory-configured with three contactors: two 3RT2035-1AG20 units for the line and star legs, and one 3RT2027-1AG20 for the delta leg. Rated at 37 kW at 400 V AC-3, with a maximum operational voltage of 690 V AC-3, this assembly is sized for medium-horsepower motor starting in applications such as pumps, compressors, and conveyors where reduced inrush current during start-up is required.
Termination, mounting, and environmental limits
Vibration resistance is specified at 18.5 g / 5 ms and 11.6 g / 10 ms under AC conditions.
Lifecycle status and compliance documentation
For audit purposes, the manufacturer provides the standard declaration of conformity covering IEC/EN 60947-4-1.
Fuse coordination and auxiliary contact configuration
For type 2 coordination, the required upstream fuses are gG NH 3NA, DIAZED 5SB, or NEOZED 5SE rated at 80 A — this must be observed to maintain short-circuit protection coordination per IEC 60947-4-1. The assembly ships without an auxiliary switch block (product extension auxiliary switch: No) and without bus communication capability (product function bus communication: No). If auxiliary contacts are needed, they must be added separately via the available screw-terminal accessory range.