Integrator note — what this reversing contactor assembly actually is
The Siemens 3RA2326-8XB30-2BB4 is a factory-assembled SIRIUS reversing contactor assembly, not a bare contactor. It ships with two 3RT2026-2BB40 contactors and a mechanical interlock (RH assembly kit 3RA2923-2AA2) already mounted on a common baseplate. The 24 VDC coil means it drops into a 24 V control circuit without a separate power supply conversion — common for PLC-driven panels. Rated 11 kW at 400 V AC-3 and 21 A at 480 V, it handles reversing duty on three-phase motors up to that load. The S0 frame size keeps the footprint compact: 90 mm wide, 114 mm high, 95 mm deep.
The AC-3 rating (11 kW at 400 V) governs the motor switching duty — starting and stopping a squirrel-cage induction motor under load. If your reversing application involves frequent jogging, size the motor load to the AC-4 figure, not the AC-3 headline. The 24 VDC coil draws from the control transformer or PLC output; verify the coil's inrush current against your DC supply's capacity — spring-type terminals accept 2x (0.5... 2.5 mm²) solid or stranded, which matches standard control wiring.
Clearance around the unit: 6 mm upwards, forwards, downwards, and to the sides; 0 mm backwards (–), so it can sit flush against the back panel. The spring-loaded terminals for the main current circuit accept 1x (18... 8) AWG or 2x (1... 10 mm²) solid. Two instantaneous auxiliary contacts are built in — enough for a feedback signal to the PLC or a seal-in circuit without adding a separate aux block.