Siemens 3RT2028-1BB40: SIRIUS 3RT2 Power Contactor for Switching Motors
The Siemens 3RT2028-1BB40 is a high-performance power contactor from the modular SIRIUS innovation range, specifically designed for switching motors and industrial loads. This Size S0 contactor is engineered for exceptional reliability and a long service life, making it a cornerstone for motor control centers and decentralized automation systems.
Designed for seamless integration with other SIRIUS components, the 3RT2028-1BB40 provides a robust solution for demanding applications where high switching frequency and operational safety are paramount.
Technical Specifications and Electrical Performance
Based on the official Siemens manufacturer data sheets, the 3RT2028-1BB40 includes the following technical characteristics:
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Rated Current (AC-3): 38 Amps (38A) at 400V, suitable for three-phase motors up to 18.5 kW.
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Control Supply Voltage: 24V DC operation, ideal for direct connection to PLC outputs.
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Auxiliary Contacts: Integrated 1 NO (Normally Open) + 1 NC (Normally Closed) auxiliary contacts for feedback and control logic.
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Main Contacts: 3-pole (3 NO) configuration for power switching.
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Connection System: Robust screw-type terminals for secure and durable wiring.
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Mechanical Endurance: Rated for up to 10 million switching cycles, ensuring minimal maintenance and high plant availability.
Industrial Advantages and System Integration
The 3RT2028-1BB40 offers strategic benefits for optimizing industrial electrical installations:
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Compact Design: The 45 mm width (Size S0) allows for high-density mounting on standard DIN rails, saving valuable space in the control cabinet.
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Global Certifications: Fully compliant with IEC, UL, and CSA standards, facilitating its use in international projects and export machinery.
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Extreme Climate Resistance: Engineered to operate reliably in a wide temperature range and in diverse environmental conditions.
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SIRIUS Ecosystem Synergy: Easily expandable with plug-in function modules, surge suppressors, and thermal overload relays, providing a flexible and future-proof motor starting solution.
