🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2037-1KB40 (AC-3 Duty, 3-Pole, 24V DC Coil, S2 Size, ~65A Class, 1NO + 1NC Auxiliary, Varistor Integrated)
The Siemens 3RT2037-1KB40 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 robust construction for demanding industrial power distribution and control systems.
This model features a 3-pole configuration with durable screw-type terminals, ensuring secure and reliable wiring connections in industrial environments.
It is equipped with a 24V DC coil (KB40 variant), making it highly suitable for PLC-based automation systems and modern low-voltage control circuits.
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) for 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 accessories, enabling flexible and scalable panel design.
• Genuine Siemens SIRIUS 3RT2 Series Contactor
• Model: 3RT2037-1KB40
• 3-Pole heavy-duty switching design
• AC-3 / AC-3e duty optimized for motor control applications
• 24V DC coil (KB40 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 control 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 | 3RT2037-1KB40 |
| 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 | 24V DC (KB40) |
| 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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