The Siemens SIRIUS 3RT2027-2BB44-3MA0 is a Size S0 power contactor with a 24 V DC coil, spring-type terminals, and a rated DC-13 switching capacity of 6 A at 24 V. The 24 V DC coil holds with an initial pickup of 0.8 x rated value and drops out reliably; the DC operating range covers 15 to 18 ms arcing time.
Switching Duty and Frequency Limits
Maximum switching frequency depends on the load category: 1 000 cycles/hour at AC-1 (resistive), 750 cycles/hour at AC-2 and AC-3 (motor starting/running), 750 cycles/hour at AC-3e, and 250 cycles/hour at AC-4 (plugging/inching). The DC-13 rating at 24 V is 6 A, dropping to 2 A at 48 V and 60 V, 1 A at 110 V, and 0.3 A at 220 V. For a 400 V AC motor circuit, the rated operational current is 3 A. The AC-3e rating (750 cycles/hour) mirrors the standard AC-3 capability, so the contactor handles motor loads up to its rated current without derating for frequency at that duty class. For high-inertia or plugging applications, the AC-4 limit of 250 cycles/hour is the binding constraint.
Spring-type terminals accept solid or stranded conductors from 1 to 10 mm², and two conductors of 0.5 to 2.5 mm² each. No auxiliary switch is integrated on this variant.
Lifecycle stage is current production. No successor or phase-out date is indicated.