Siemens 3RT2028-1AK60 3-Phase AC Magnetic Contactor

Siemens 3RT2028-1AK60 is a 3-pole AC power contactor (size S0) designed for AC-3e motor control of three-phase loads up to 38 A and up to 18.5 kW at 400 V. The coil accepts 110 V AC at 50 Hz or 120 V AC at 60 Hz, making it compatible with common control circuits; the contactor includes a built-in auxiliary block with 1 NO and 1 NC contact and uses screw terminals for wiring. Insulation voltage is rated to 690 V for both main and auxiliary circuits, with coil-to-main isolation rated at 400 V and surge withstand of 6 kV. Weight is approximately 0.426 kg and it operates from -25 to +60 C, up to 2,000 m altitude, with relative humidity up to 95% at 55 C. Coil power consumption is around 9.6 W at rated current in hot operation, 3.2 W per coil, and about 2.7 W in no-load conditions. Mechanical life is typically 10,000,000 cycles for the base unit, with 5,000,000 cycles when fitted with an electronically optimized auxiliary switch block or 10,000,000 cycles with the standard auxiliary block. This model is part of Siemens’ 3RT2 family, cataloged as 3RT2028-1AK60, and is commonly used as a motor starter in industrial control panels where compact, reliable three-phase switching is required.