Siemens 3RT2028-1AK60 Three Phase Industrial Contactor

Siemens 3RT2028-1AK60 is a three-pole Sirius power contactor designed for AC‑3e duty, rated for 38 A and 18.5 kW at 400 V in motor-control circuits. It uses a 110 V AC coil at 50 Hz or 120 V AC at 60 Hz and includes a single auxiliary contact block with 1 normally open and 1 normally closed contact, with screw terminals and a size S0 footprint (weight about 0.426 kg). The main and auxiliary circuits are rated for insulation up to 690 V (pollution degree 3) and have a surge resistance of 6 kV; the unit operates from −25 to +60 °C and up to 2,000 m above sea level. Mechanical life is specified at 10,000,000 operating cycles for the contactor, with similar life characteristics for configurations that add auxiliary switching blocks.