Overview
The Siemens 3RT2027-2AG20 is a compact, industrial-grade power contactor from the SIRIUS 3RT2 family. This AC-3 rated unit handles motor loads up to 15 kW at 400 V three-phase, with a nominal current of 32 A. Designed for reliable switching in motor control circuits, the 3RT2027-2AG20 combines proven reliability with the integration benefits of Siemens’ modular SIRIUS system.
Key Features
- AC-3 Motor Duty Rating: 32 A, 15 kW/400 V—handles three-phase induction motor loads
- 110 V AC Control Coil: 50/60 Hz, allowing standard industrial control voltage in most regions
- Compact Size S0: Reduces panel footprint without sacrificing contact reliability
- Auxiliary Contact Block: Built-in 1 NO + 1 NC (changeover) contacts for feedback and interlocking
- Spring-Loaded Terminals: Fast, tool-free wire insertion and secure connection; simplifies installation and troubleshooting
- High Contact Reliability: Proven performance in modular SIRIUS load-feeder combinations
Technical Specifications
- Contactor Size: S0
- Rated Current (AC-3): 32 A
- Power Rating (AC-3, 400 V): 15 kW
- Coil Voltage: 110 V AC
- Coil Frequency: 50/60 Hz
- Number of Poles: 3
- Auxiliary Contacts: 1 NO + 1 NC
- Terminal Type: Spring-loaded (push-in)
- Power Loss (at rated current): 6.3 W total (2.3 W per pole)
- Isolation Voltage: Pollution Degree 3
Typical Applications
The 3RT2027-2AG20 is ideal for:
- Motor starter circuits (up to 15 kW three-phase motors)
- Machine tool automation and CNC control
- Pump and compressor switching
- Production line conveyor systems
- HVAC and refrigeration unit control
- Manufacturing and process automation
Compatibility & Replacements
Compatible With
- Siemens SIRIUS 3RT2 modular contactor system
- IEC 60947-4-1 compliant load feeders and motor starters
- Standard industrial 110 V AC control circuits (50/60 Hz)
- Auxiliary contact blocks (1 NA + 1 NC configuration)
- Motor overload relay units (ThermoMag or electronic types)
Replaces / Drop-In Replacement For
- Verify compatibility with your system integrator before ordering. Many contactors share the same form factor and coil voltage; however, direct mechanical and electrical drop-in replacement depends on your specific load feeder cabinet or starter assembly.
Works With
- IEC 60947-4-1: Standard power contactor architecture
- SIRIUS Load Feeders: Modular starter units incorporating 3RT2 contactors
- Siemens SCADA/HMI: Indirect control via PLC or relay logic
- Manual or Programmable Control: Suitable for logic-level or field-proven relay-based automation
