SIEMENS 3TF5044-0XM0 – 3-Phase AC Magnetic Contactor | SIRIUS Classic Series
Engineering Background
The SIEMENS 3TF series magnetic contactors are part of the SIRIUS Classic platform — Siemens’ proven industrial switching device family engineered for demanding motor control and power switching applications. The 3TF5044-0XM0 is a heavy-duty 3-phase AC contactor designed for continuous duty cycles in industrial automation environments where reliability and switching precision are non-negotiable.
Product Positioning
Targeted at procurement engineers and system integrators specifying components for motor control centers (MCC), machine tool panels, and process automation cabinets. The 3TF5044-0XM0 delivers robust main contact performance with 4 normally open (4NO) auxiliary contacts, making it suitable for complex interlocking and signaling schemes without additional auxiliary contact blocks.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | SIEMENS AG |
| Part Number / SKU | 3TF5044-0XM0 |
| Series / Platform | SIRIUS Classic – 3TF50 |
| Device Type | 3-Phase AC Magnetic Contactor |
| Main Contacts | 3-pole, normally open (3NO) |
| Auxiliary Contacts | 4NO (integrated) |
| Coil Voltage | Multi-voltage / per suffix -0XM0 (consult datasheet) |
| Rated Operational Current (AC-3) | Per IEC 60947-4-1 (refer to Siemens catalog) |
| Utilization Category | AC-3 (squirrel-cage motors) |
| Mounting | DIN rail / screw mounting |
| Country of Origin | Germany (DE) |
| HS Code | 853649 |
| Weight | 4.3 kg |
| Standards | IEC 60947-4-1, EN 60947-4-1, UL 508 |
Proven Application Environments
- Motor Control Centers (MCC): Direct-on-line (DOL) and star-delta motor starters in industrial plants
- Machine Tools & CNC Panels: Spindle motor switching and axis drive control
- Process Automation: Pump, compressor, and conveyor motor control in chemical, oil & gas, and water treatment facilities
- Building Automation: HVAC fan and chiller motor switching in large commercial installations
- Power Distribution Panels: Capacitor bank switching and load management circuits
Engineering Advantages
- Integrated 4NO Auxiliary Contacts: Eliminates the need for add-on auxiliary contact blocks, reducing panel wiring complexity and BOM cost
- SIRIUS Classic Platform Compatibility: Fully interchangeable with SIRIUS overload relays (3RU/3RB series) and circuit breakers for coordinated Type 2 protection
- Proven IEC & UL Dual Certification: Accepted in both European and North American project specifications
- High Mechanical & Electrical Endurance: Designed for millions of operating cycles under rated conditions
- Compact Footprint: Optimized for space-constrained control panels without sacrificing current rating
System Architecture & Signal Flow
In a typical DOL motor starter circuit, the 3TF5044-0XM0 sits between the upstream circuit breaker (e.g., SIEMENS 3RV series) and the motor terminals. The control coil (A1/A2) is energized via the PLC digital output or pushbutton circuit. Upon energization, the 3 main poles close simultaneously, connecting the 3-phase supply to the motor. The 4NO auxiliary contacts provide:
- 1× Self-holding (seal-in) contact for latching circuits
- 1× Run-status feedback to PLC digital input
- 2× Interlocking contacts for reversing or star-delta schemes
Downstream, a SIRIUS 3RU or 3RB overload relay provides thermal or electronic motor protection, completing the IEC Type 2 coordination assembly.
Sourcing & Quality Verification
- OEM Traceability: All units sourced with verifiable Siemens batch documentation and CE/UL markings
- Pre-shipment Inspection: Coil resistance, contact continuity, and mechanical operation verified before dispatch
- Packaging Integrity: Original Siemens packaging preserved; tamper-evident sealing on all units
- Counterfeit Prevention: Holographic labels and serial number cross-referenced against Siemens product database
Procurement Process
- Submit RFQ via support@konmask.com or WhatsApp +0086 19859288691
- Receive formal quotation with lead time and stock confirmation within 24 hours
- Issue PO — payment via T/T, PayPal, or trade assurance
- Dispatch within 1–3 business days; DHL/FedEx express available
- Receive shipment with full documentation: invoice, packing list, COO certificate
Technical FAQ
Q: What does the suffix -0XM0 indicate?
A: The suffix encodes the coil voltage variant. -0XM0 designates a specific coil voltage range — please confirm with the Siemens catalog or contact us for the exact coil voltage specification for your application.
Q: Is the 3TF5044-0XM0 compatible with SIRIUS 3RU2 overload relays?
A: Yes. The 3TF50 frame is designed for direct mounting with SIRIUS 3RU2 and 3RB3 overload relays for IEC Type 2 coordination.
Q: Can this contactor be used for capacitor switching (AC-6b)?
A: The standard 3TF50 is rated for AC-3 (motor switching). For capacitor bank switching (AC-6b), consult Siemens for the appropriate derating or dedicated capacitor contactor variant.
Q: What is the typical mechanical endurance?
A: SIRIUS Classic contactors are rated for ≥10 million mechanical operations under no-load conditions per IEC 60947-4-1.
Q: Do you provide a warranty?
A: Yes — 12-month warranty against manufacturing defects. Replacement or full refund guaranteed for verified OEM units.
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