The Siemens SIRIUS 3RT2018-1AP02 is a size S00 power contactor with a 24 VDC coil, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. It carries an auxiliary switch and is rated for 10 A at 24 V on the auxiliary contacts, with a mechanical service life of 30,000,000 operating cycles typical.
Duty Class and Switching Frequency
Switching frequency is duty-dependent: 1,000 cycles/hour at AC-1 (resistive), 750 cycles/hour at AC-2 and AC-3 (motor starting/running), and 250 cycles/hour at AC-4 (plugging/inching). The AC-3e rating also permits 750 cycles/hour. These limits govern the thermal load on the contactor in repetitive switching applications.
Coil and main contact terminals are screw-type. Conductor cross-sections accepted: solid or stranded 0.5 to 4 mm², or two conductors per terminal: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Main contact torque range is 20 to 12 (units implied as Nm or in-lbs per standard practice).
Auxiliary contact current ratings vary with voltage: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.2 A at 440 V. Motor rating at 230 V is 2 hp.