🔹 Siemens SIRIUS 3RT2 Power Contactor – 3RT2036-1NB308K (AC-3 Duty, 3-Pole, 24–33V AC/DC Coil, S2 Size, ~51A Class, 1NO + 1NC Auxiliary, Varistor Integrated)
The Siemens 3RT2036-1NB308K 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 handling capability with a robust modular construction suitable for industrial control panels and power distribution systems.
This model features a 3-pole configuration with durable screw-type terminals, ensuring secure wiring connections and long operational life in demanding environments.
It is equipped with a 24–33V AC/DC coil (NB308K variant), making it suitable for modern PLC-based automation systems where flexible AC/DC control signals are required.
A key feature of this variant is the integrated varistor, which suppresses switching surges and protects control electronics from voltage spikes, improving system reliability.
It also includes auxiliary contacts (1NO + 1NC) for feedback, interlocking, and control signal integration in industrial applications.
Built on the Siemens SIRIUS modular platform, it supports seamless integration with overload relays and accessories, allowing flexible and scalable panel design.
• Genuine Siemens SIRIUS 3RT2 Series Contactor
• Model: 3RT2036-1NB308K
• 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 (~51A class)
• Integrated varistor for surge suppression
• Screw terminal connection for secure wiring
• Auxiliary contacts: 1NO + 1NC
• Suitable for PLC & automation systems
• High electrical and mechanical endurance
• Compatible with Siemens overload relays & accessories
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3RT2 |
| Model Number | 3RT2036-1NB308K |
| Product Type | Power Contactor |
| Frame Size | S2 |
| Poles | 3 Pole |
| Utilization Category | AC-3 / AC-3e |
| Rated Current | ~51 A |
| Power Rating | ~22 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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