🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2037-1NB30 (AC-3 Duty, 3-Pole, 24–33V AC/DC Coil, S2 Size, ~65A Class, 1NO + 1NC Auxiliary, Integrated Varistor)
The Siemens 3RT2037-1NB30 is a heavy-duty SIRIUS 3RT2 series power contactor designed for switching motors and industrial loads under AC-3 / AC-3e duty applications. It belongs to the S2 frame size category, offering high current capacity and reliable performance for industrial power distribution and motor control systems.
This model features a 3-pole configuration with durable screw-type terminals, ensuring secure and stable wiring connections in demanding industrial environments.
It is equipped with a 24–33V AC/DC coil (NB30 variant), making it suitable for modern PLC-based and hybrid control systems where both AC and DC control signals are used.
A key feature of this variant is the integrated varistor, which suppresses switching surges and protects control electronics from voltage spikes, improving system reliability and extending component life.
It also includes auxiliary contacts (1NO + 1NC), enabling feedback, interlocking, and control signal integration in automation and motor control applications.
Built on the Siemens SIRIUS modular platform, it supports seamless integration with overload relays and accessory modules, allowing flexible and scalable panel design.
• Genuine Siemens SIRIUS 3RT2 Series Contactor
• Model: 3RT2037-1NB30
• 3-Pole heavy-duty switching design
• AC-3 / AC-3e duty optimized for motor control applications
• 24–33V AC/DC coil (NB30 variant)
• S2 frame size (~65A class)
• Screw terminal connection for secure wiring
• Integrated varistor for surge suppression
• Auxiliary contacts: 1NO + 1NC
• Suitable for PLC and automation systems
• High electrical and mechanical endurance
• Compatible with Siemens overload relays & accessories
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2037-1NB30 |
| 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 (NB30) |
| 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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