What this star-delta assembly contains and how it mounts
The 3RA2425-8XH32-1BB4 is a factory-assembled SIRIUS contactor set for star-delta (wye-delta) motor starting — it ships with three contactors: two 3RT2026-1BB40 (one with a -0CC0 suffix) and one 3RT2024-1BB40, plus the RS assembly kit 3RA2923-2BB1. The assembly mounts on 35 mm DIN rail (screw and snap-on) and occupies an S0 frame footprint: 135 mm wide, 101 mm high, 181 mm deep. Clearance requirements around the unit are 6 mm upward, forward, downward, and to the side; no clearance needed at the rear.
Motor power ratings and coil drive
The required upstream fuse for coordination is 35 A (gG NH 3NA, DIAZED 5SB, or NEOZED 5SE types). The magnet coil is 24 VDC with a closing and holding power of 13.8 W — a DC coil means no hum and consistent pull-in force regardless of line frequency, but the DC supply must be capable of delivering the inrush at coil closure. The assembly is rated for vibration at 11.8 g / 5 ms and 7.4 g / 10 ms (AC) and 15 g / 5 ms and 10 g / 10 ms (DC) — figures that matter for applications on mobile equipment or near rotating machinery.
Termination and wiring details
Main current circuit and auxiliary/control circuit both use screw-type terminals. AWG equivalents for main contacts are 2x (16 to 12) and 2x (14 to 8). The assembly has 3 instantaneous main contacts and no built-in auxiliary switch or bus communication — any auxiliary contacts or fieldbus interface must be added externally via the SIRIUS accessory range.
The mechanical life of the contactors is typical 10 million operations — a figure that assumes proper coil drive and contactor application within rated duty. For high-cycle applications (frequent starts per hour), factor in the contactor electrical life at the specific motor current.