The Siemens 3RT2038-1NB308K is a high-performance SIRIUS 3RT2 Series power contactor engineered for reliable motor switching and industrial automation applications. Designed for AC-3 duty, this 3-pole contactor is rated for 80A operational current and supports three-phase motors up to 37kW at 400V, making it ideal for pumps, compressors, conveyors, fans, HVAC systems, machine tools, and heavy-duty industrial equipment.
Equipped with a 20–33V AC/DC electronic operating coil (Variant NB308K), the contactor offers flexible control voltage compatibility and dependable operation in modern automation systems. The electronic coil design ensures reduced power consumption, improved tolerance to voltage fluctuations, and enhanced reliability in demanding industrial environments.
The 3RT2038-1NB308K features 3 Normally Open (3NO) main contacts and 1 Normally Open (1NO) + 1 Normally Closed (1NC) integrated auxiliary contacts as standard. These auxiliary contacts simplify signaling, monitoring, interlocking, and control functions without requiring additional accessories.
Built in the compact yet robust S2 frame size, the contactor utilizes durable screw terminal connections for secure conductor termination, easy installation, and simplified maintenance. Its rugged construction makes it suitable for motor control centers (MCCs), industrial control panels, OEM machinery, manufacturing facilities, and process automation systems.
The NB308K coil variant includes integrated surge suppression, helping protect control circuits from switching transients and voltage spikes. This improves system reliability and extends the service life of connected automation equipment.
Manufactured according to Siemens SIRIUS quality standards, the contactor offers a rated insulation voltage of up to 1000V, high electrical endurance, and a mechanical service life of up to 10 million operating cycles, ensuring long-term reliability in demanding industrial applications. Siemens SIRIUS contactors are widely used in industrial automation, motor control, and power distribution systems worldwide.
As part of the trusted Siemens SIRIUS 3RT2 family, the 3RT2038-1NB308K provides dependable motor switching performance, operational efficiency, and seamless compatibility with Siemens overload relays, motor starters, auxiliary contact blocks, and industrial automation solutions.
| Specification | Details |
|---|---|
| Product Name | Power Contactor |
| Brand | Siemens |
| Series | SIRIUS 3RT2 |
| Model Number | 3RT2038-1NB308K |
| SKU | 3RT2038-1NB308K |
| Product Type | Power Contactor |
| Utilization Category | AC-3 |
| Rated Operational Current (AC-3) | 80 A |
| Motor Rating at 400V | 37 kW |
| Number of Poles | 3 Pole |
| Main Contacts | 3 NO |
| Auxiliary Contacts | 1 NO + 1 NC |
| Coil Voltage | 20–33 V AC/DC |
| Coil Variant | NB308K |
| Coil Type | Electronic Coil |
| Frame Size | S2 |
| Terminal Type | Screw Terminals |
| Integrated Surge Suppression | Yes |
| Rated Insulation Voltage (Ui) | Up to 1000 V |
| Protection Class | IP20 |
| Mechanical Life | Up to 10 Million Operations |
| Mounting Type | Panel Mount |
| Operating Temperature | -25°C to +60°C |
| Application | Motor Control & Industrial Switching |
| Product Family | Siemens SIRIUS Contactors |
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