SIRIUS S0 contactor — what the 1,000 ops/h at AC-3 means for your motor circuit
The 3RT2024-1BP40 is a Siemens SIRIUS S0 power contactor rated for 1,000 operating cycles per hour in AC-3 duty (switching squirrel-cage motors) — that's one start-stop every 3.6 seconds, which covers most conveyor, pump, and fan cycling without derating the switching frequency. In AC-4 duty (plugging/inching), the maximum drops to 300 ops/h — the contact wear from breaking locked-rotor current limits the mechanical pace, so if your application does frequent reversing, you need to stay under that ceiling. The coil is 230 V AC, screw-type terminals, and the contactor carries an auxiliary switch — no separate add-on block needed for basic status feedback.
The main contact rating range is 16 to 8 — likely the thermal current (Ith) range in amps for the S0 frame, so size your motor FLA against the lower end of that window for continuous duty.
Auxiliary contact ratings — what switches at each voltage
At 400 V the auxiliary contact is rated 3 A — enough to drive a small contactor or PLC input directly without an interposing relay. The motor horsepower rating at 230 V is 2 hp — a direct match for a 1.5 kW motor on a 230 V single-phase or line-to-line supply.