Siemens 3RT2028-1AP00 Power Contactor 38A 18.5kW 3P 230V AC

The Siemens 3RT2028-1AP00 is a SIRIUS 3RT2 size S0 3-pole power contactor rated 38 A at AC-3 / 400 V, corresponding to 18.5 kW. The coil operates on 230 V AC, 50 Hz and the unit ships with integrated auxiliary contacts (1 NO + 1 NC) on screw terminals. Maximum operating voltage across the main circuit is 690 V, covering AC-3e, AC-1, and AC-4 duty categories.

Technical specifications:

• MLFB: 3RT2028-1AP00
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Power contactor (3RT2), size S0
• Main poles: 3
• Rated current at AC-3 / 400 V: 38 A
• Rated current at AC-1 / 400 V: 50 A
• Rated power at AC-3 / 400 V: 18.5 kW
• Rated power at AC-3 / 230 V: 11 kW
• Maximum operating voltage (AC-3, AC-3e): 690 V
• Control supply voltage: 230 V AC, 50 Hz
• Auxiliary contacts: 1 NO + 1 NC
• Terminal type: screw terminal
• Insulation voltage (main and auxiliary circuits): 690 V
• Surge voltage resistance: 6 kV
• Mechanical service life: 10,000,000 operating cycles
• Power loss in hot operating state (AC): 9.6 W
• Operating temperature: -25 ... +60 °C
• Storage temperature: -55 ... +80 °C
• Installation altitude: max 2,000 m
• Net weight: 418 g

Features and benefits:

• Mechanical service life of up to 10,000,000 operating cycles for long service intervals
• Wide ambient temperature range (-25 to +60 °C) allows use in demanding environments
• Operating frequency up to 750 switching operations per hour at AC-3 and AC-3e
• 690 V insulation voltage on both main and auxiliary circuits with 6 kV surge resistance
• Compact size S0 footprint with screw terminals accepting up to 10 mm² minimum cross-section
• Low holding power of 9.8 VA at 50 Hz reduces continuous coil energy consumption

Applications:

• Starting and switching three-phase induction motors up to 18.5 kW / 400 V
• Reversing starters and star-delta motor starters in industrial control panels
• Pump, fan, and compressor switching in HVAC and process installations
• Machine automation and conveyor control systems

Compliant with EN 60947-1 and tested to IEC 60068-2-30. Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2028-1AP00, SIRIUS power contactor 38A 230V, 3RT2 contactor S0 18.5kW.