SIRIUS 3RT2026-2AB04 — Size S0 Power Contactor, Spring-Terminal
The Siemens SIRIUS 3RT2026-2AB04 is a Size S0 power contactor rated for 21 A at 480 V in AC-3 duty — that's the motor-switching current, so it handles a 10 hp motor at 480 V three-phase without derating.
The 21 A at 480 V AC-3 rating is the key selection number — it tells you the contactor can switch a three-phase induction motor drawing 21 A under full load, breaking the current during start and stop. For resistive loads (AC-1), the mechanical switching frequency goes up to 1,000 operations per hour; for motor duty at AC-3, it's 750 ops/h. The 10 million mechanical operations typical life means this contactor outlasts most machines it's installed in — you'll replace the machine before the contactor wears out mechanically.
Coil and Auxiliary Contact Notes
This variant ships without an auxiliary switch block — you add a separate SIRIUS auxiliary contact block if you need N.O./N.C. feedback for the PLC or status indication. The coil is 24 VDC rated at 6 A — that's the inrush, not the hold; the actual sealed current is lower. The spring terminals accept 2x (0.5 to 2.5 mm²) for control wiring — fine for the coil circuit and any auxiliary wiring.