Siemens 3RT1034-1AC20 Power Contactor: Comprehensive Technical Guide for Industrial Automation Applications
Siemens 3RT1034-1AC20 Power Contactor
Industrial-Grade 3-Phase Motor Control Solution
Part of the Siemens SIRIUS 3RT1 Series - Professional Automation Component
Product Overview
The Siemens 3RT1034-1AC20 is a high-performance 3-pole power contactor designed for industrial motor control applications. As part of the renowned SIRIUS 3RT1 series, this contactor provides reliable switching of electric motors and power circuits in demanding industrial environments. Rated for AC-3 operation up to 32A at 400V, it offers robust performance for a wide range of automation applications.
Product Images
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | 3-Pole Power Contactor |
| Series | Siemens SIRIUS 3RT1 |
| Rated Current (AC-3) | 32 A at 400 V |
| Rated Power | 15 kW / 400 V |
| Coil Voltage | 24 V AC, 50/60 Hz |
| Poles | 3-Pole |
| Size Category | S2 |
| Terminal Type | Screw Terminal |
| Mounting | DIN Rail / Surface Mounting |
| Motor Power Rating | 10 HP at 230V, 25 HP at 460V |
| Utilization Category | AC-3 (Squirrel cage motors) |
| Electrical Life | ≥ 1 million operations (AC-3) |
| Mechanical Life | ≥ 10 million operations |
Key Features & Benefits
Robust Construction
The 3RT1034-1AC20 features a durable design with high-quality materials ensuring reliable operation in harsh industrial environments. The contactor is built to withstand vibration, temperature variations, and electrical stresses.
Versatile Mounting Options
Designed for both DIN rail mounting (35mm) and surface mounting, providing flexibility in panel design and installation. The compact S2 size allows for space-efficient control cabinet layouts.
High Switching Capacity
With AC-3 rating of 32A at 400V, this contactor can handle demanding motor starting currents and frequent switching operations, making it suitable for industrial automation applications.
Standard Coil Voltage
The 24V AC coil voltage (50/60 Hz) is compatible with standard control circuits and PLC outputs, simplifying system integration and reducing the need for additional power supplies.
Typical Applications
Motor Control Centers
Primary switching device for three-phase induction motors in industrial plants, manufacturing facilities, and process industries.
HVAC Systems
Control of compressor motors, fan motors, and pump motors in heating, ventilation, and air conditioning systems.
Material Handling
Conveyor systems, hoists, cranes, and automated storage/retrieval systems requiring reliable motor control.
Industrial Machinery
Machine tools, packaging equipment, printing presses, and other manufacturing machinery with three-phase motor drives.
Pump & Compressor Control
Water treatment plants, irrigation systems, and industrial compressor applications requiring robust motor switching.
Building Automation
Elevator controls, escalator systems, and other building services requiring reliable motor control solutions.
Installation & Wiring Guidelines
Mounting Instructions
1. Ensure proper clearance around the contactor for ventilation and maintenance access
2. Use appropriate DIN rail (35mm) or surface mounting hardware
3. Verify mounting surface is clean and free from vibration
4. Follow torque specifications for terminal screws (typically 1.2-1.5 Nm)
Wiring Recommendations
1. Use copper conductors with appropriate cross-section for the rated current
2. Ensure proper cable termination and strain relief
3. Maintain separation between power and control wiring
4. Use appropriate fusing and overload protection as per local regulations
5. Verify coil voltage matches supply voltage (24V AC)
Comparison with Successor Product
| Feature | 3RT1034-1AC20 (3RT1 Series) | SIRIUS 3RT2 (Successor) |
|---|---|---|
| Series Generation | Previous Generation | Current Generation |
| Availability | Phased Out (Replacement Only) | Active Production |
| Design Features | Traditional Design | Enhanced Features & Compact Design |
| Accessory Compatibility | Limited to 3RT1 Series | Wider Range of Accessories |
| Technical Support | Limited (Legacy Product) | Full Technical Support |
| Recommended Use | Replacement in Existing Systems | New Installations |
Frequently Asked Questions (FAQ)
Technical References & Documentation
External Resources
• Siemens SiePortal: Official Product Documentation
• IMC-Direct: Product Specifications & Availability
• MRO Electric: Technical Details & Support
• Control Parts: Replacement Parts & Accessories
Industry Standards Compliance
• IEC/EN 60947-4-1: Low-voltage switchgear and controlgear - Contactors and motor-starters
• IEC/EN 60947-1: General rules for low-voltage switchgear and controlgear
• UL 508: Industrial Control Equipment
• CSA C22.2 No. 14: Industrial Control Equipment
Safety & Operational Considerations
Important Safety Information
1. Qualified Personnel Only: Installation and maintenance should only be performed by qualified electrical personnel
2. Proper Isolation: Always disconnect and lock out power before working on the contactor
3. Overload Protection: Always use appropriate overload relays or circuit breakers for motor protection
4. Environmental Conditions: Ensure operating environment meets specified temperature, humidity, and altitude requirements
5. Regular Inspection: Periodically inspect for signs of overheating, arcing, or mechanical wear
Conclusion
The Siemens 3RT1034-1AC20 power contactor represents a reliable, industrial-grade solution for three-phase motor control applications. While it has been succeeded by the newer 3RT2 series, this contactor continues to serve in numerous industrial installations worldwide. Its robust construction, 32A AC-3 rating, and 24V AC coil operation make it suitable for a wide range of automation applications. For new installations, Siemens recommends using the current-generation 3RT2 series, but for maintenance and replacement in existing systems, the 3RT1034-1AC20 remains a viable option through authorized distribution channels.
Last Updated: Current technical information based on manufacturer specifications and industry resources.
Disclaimer: Always consult the latest manufacturer documentation and local electrical codes before installation. Specifications are subject to change without notice.
