Siemens 3RT2027-1BB44 SIRIUS Power Contactor 3P 32A 15kW 24V DC

The Siemens 3RT2027-1BB44 is a SIRIUS power contactor from the 3RT2 range, rated for AC-3e/AC-3 motor switching duty at 32 A and 15 kW at 400 V. Its 3-pole main circuit is controlled by a 24 V DC coil and features a removable auxiliary switch block providing 2 NO and 2 NC contacts. Size S0 format with screw terminals makes it suitable for compact industrial panel builds.

Technical specifications:

• MLFB: 3RT2027-1BB44
• Manufacturer: Siemens
• Product line: SIRIUS
• Type designation: 3RT2
• Size: S0
• Main circuit poles: 3
• Rated current AC-3/AC-3e at 400 V: 32 A
• Rated current AC-3/AC-3e at 690 V: 21 A
• Rated current AC-1 at 400 V (40 °C): 50 A
• Operating power AC-3 at 400 V: 15 kW
• Operating power AC-3 at 690 V: 18.5 kW
• Max operating voltage (AC-3/AC-3e): 690 V
• Auxiliary contacts: 2 NO + 2 NC, removable
• Control voltage: 24 V DC
• Coil closing and holding power: 5.9 W
• Terminal type: Screw terminal
• Insulation voltage (main and auxiliary circuit): 690 V
• Surge voltage resistance: 6 kV
• Operating temperature: -25 ... +60 °C
• Storage temperature: -55 ... +80 °C
• Installation altitude: max 2000 m
• Mechanical service life: 10,000,000 operating cycles
• Max operating frequency AC-3: 750 1/h
• Closing delay (DC): 50-170 ms
• Opening delay (DC): 15-18 ms

Features and benefits:

• 24 V DC coil with identical closing and holding power (5.9 W), directly compatible with standard PLC output cards
• Removable 2 NO + 2 NC auxiliary switch block for flexible control circuit wiring
• 10,000,000 mechanical operating cycles for long panel service life
• Supports up to 750 switching operations per hour at AC-3, suitable for frequent-start applications
• Wide operating temperature range of -25 to +60 °C covers demanding industrial environments
• 690 V insulation voltage and 6 kV surge voltage resistance for high-voltage system compatibility

Applications:

• Three-phase motor switching and reversing duty in AC-3 and AC-3e applications
• Industrial control panels driven by 24 V DC PLC output stages
• HVAC, pump, and compressor motor control up to 15 kW at 400 V
• Automation lines requiring high switching frequency up to 750 operations per hour
• Industrial load switching in systems up to 690 V

Compliant with EN 60947-1. Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2027-1BB44, SIRIUS 3RT2 32A 24VDC power contactor.