Overview
The Siemens 3RT2047-3AL20 is a high-performance industrial power contactor designed for reliable switching of motors and electrical loads in demanding environments. Part of the Sirius modular system, this contactor delivers exceptional durability, strong electrical capability, and simple integration into automation systems. Its combination of 110 A AC-3 rating, 55 kW motor switching power, and compact S3 frame size makes it an excellent choice for heavy-duty applications.
Engineered with Siemens’ precision, the device features a robust mechanical design, energy-efficient operation, and long service life—ideal for industrial panels, machinery controls, and motor starter assemblies.
Key Features
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110 A AC-3 / AC-3e Rated for heavy-duty motor control
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55 kW switching capacity at 400 V
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3-pole configuration for standard industrial motor applications
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230 V AC coil voltage (50/60 Hz)
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Equipped with 1 NO + 1 NC auxiliary contacts
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Main circuit: screw terminals for secure power wiring
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Control & auxiliary circuits: spring-loaded terminals for fast installation
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Compact S3 size for efficient panel layout
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Fully compatible with Siemens Sirius modular accessories
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High electrical durability and mechanical reliability
Benefit
Reliable Motor Switching
High AC-3 rating ensures dependable switching of induction motors in demanding industrial environments.
Easy Wiring & Fast Installation
Screw terminals for power circuits and spring-loaded terminals for control wiring reduce setup time and enhance safety.
Space-Saving Design
The S3 frame size offers powerful capability while conserving panel space.
Long Service Life
Optimized for endurance, making it cost-effective for continuous industrial operation.
Flexible Integration
Compatible with Siemens overload relays, auxiliary blocks, and automation components.
Application
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Industrial motor control systems
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Conveyor and material-handling machinery
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HVAC motor starters
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Pumps, compressors, and fans
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Automated production lines
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Control panels and switchboards
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