The Siemens 3RT2026-2BB40-Z W97 is a SIRIUS 3RT2 power contactor in the S0 frame size, rated for AC-3e/AC-3 duty at 25 A and 11 kW on a 400 V three-phase system. The 24 V DC coil means it integrates directly into a 24 VDC control circuit common in modern panels, without needing an AC coil and separate rectifier. The auxiliary contact block is built in: 1 normally-open and 1 normally-closed.
The S0 frame size is the smallest in the SIRIUS 3RT2 family — 115 x 110 x 45 mm — so it fits on a standard DIN rail with a 45 mm width footprint. That leaves room alongside a motor circuit breaker or overload relay in the same row. The spring-loaded terminals accept 0.2–2.5 mm² (typical for control wiring) and the 24 V DC coil draws a holding current low enough that a standard PLC digital output can drive it directly through an interposing relay if needed. For a panel OEM wireman, the multi-unit packaging (pack of 8) means you order one line item for a batch of identical panels, reducing kitting complexity.