🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2037-1NB308K (AC-3 Duty, 3-Pole, 24–33V AC/DC Coil, S2 Size, ~65A Class, 1NO + 1NC Auxiliary, Integrated Varistor)
The Siemens 3RT2037-1NB308K is a high-performance SIRIUS 3RT2 series power contactor engineered for reliable switching of motors and industrial loads under AC-3 / AC-3e duty applications. Designed within the S2 frame size category, it offers excellent switching performance, high operational reliability, and long service life for industrial automation and motor control systems.
This contactor features a 3-pole design with robust screw terminal connections, ensuring secure wiring and dependable operation in demanding electrical environments.
The unit is equipped with a 24–33V AC/DC coil (NB308K variant), making it suitable for PLC-controlled systems and applications requiring flexible AC/DC control voltage compatibility.
A key feature of this model is its integrated varistor, which helps suppress switching surges and protects sensitive control electronics from transient voltage spikes, enhancing system reliability.
Additionally, the contactor includes 1NO + 1NC auxiliary contacts for feedback, interlocking, status indication, and control circuit integration.
Built on the Siemens SIRIUS modular platform, the 3RT2037-1NB308K supports seamless integration with overload relays and accessories, enabling scalable and efficient panel designs.
• Genuine Siemens SIRIUS 3RT2 Series Contactor
• Model: 3RT2037-1NB308K
• 3-Pole heavy-duty switching design
• AC-3 / AC-3e duty optimized for motor control
• 24–33V AC/DC coil (NB308K variant)
• S2 frame size (~65A class)
• Integrated varistor for surge suppression
• Screw terminal connection for secure wiring
• Auxiliary contacts: 1NO + 1NC
• Suitable for PLC and automation systems
• High electrical and mechanical endurance
• Compatible with Siemens overload relays & accessories
• Modular and scalable panel design
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2037-1NB308K |
| Product Type | Power Contactor |
| Frame Size | S2 |
| Poles | 3 Pole |
| Utilization Category | AC-3 / AC-3e |
| Rated Current | ~65 A |
| Power Rating | ~30 kW @ 400V |
| Coil Voltage | 24–33V AC/DC (NB308K) |
| Auxiliary Contacts | 1NO + 1NC |
| Terminal Type | Screw Terminals |
| Special Feature | Integrated Varistor |
| Mounting Type | Panel / DIN Rail (via accessories) |
| Brand | Siemens |
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