Over Speed Protection Solution – Allen-Bradley 1440-REX03-04RG | Dynamix Series
Where This Product Is Used
The Allen-Bradley 1440-REX03-04RG is an over speed relay module engineered for critical rotating machinery protection across demanding industrial environments. Typical deployment scenarios include:
- Turbine Protection Systems – Steam and gas turbines in power generation plants where runaway speed events can cause catastrophic mechanical failure.
- Compressor Trains – Centrifugal and reciprocating compressors in oil & gas upstream/midstream facilities requiring API 670-compliant overspeed trip logic.
- High-Speed Pump Stations – Booster pump stations in water treatment and chemical processing where motor overspeed threatens seal and bearing integrity.
- Paper & Pulp Mill Drives – Winder and refiner drives where speed excursions risk web breaks and equipment damage.
- Mining Conveyor Drives – Head-end drive systems on long-haul conveyors requiring independent speed monitoring separate from the main drive controller.
- Wind Turbine Nacelles – Rotor overspeed detection as a safety-layer independent of the main turbine controller.
Technical Specifications
| Part Number | 1440-REX03-04RG |
| Series | Dynamix |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Module Type | Over Speed Relay Module |
| Relay Outputs | 4 relay outputs (configurable) |
| Speed Input Channels | 3 independent speed sensor inputs |
| Input Signal Compatibility | Passive magnetic pickups, active proximity probes, TTL pulse inputs |
| Trip Logic | 2-out-of-3 (2oo3) voting architecture |
| Speed Range | 0 – 99,999 RPM |
| Response Time | < 20 ms typical |
| Power Supply | 18–32 VDC |
| Operating Temperature | 0 °C to +60 °C |
| Mounting | DIN rail / panel mount |
| Communication | EtherNet/IP (Dynamix platform integration) |
| Weight | 200 g (approx.) |
Why Engineers Specify This Model
- 2oo3 Voting Architecture – Three independent speed inputs with majority-vote trip logic eliminates single-sensor nuisance trips while maintaining SIL 2 integrity.
- Sub-20 ms Trip Response – Hardware-level relay actuation ensures the machine is tripped before mechanical damage propagates, critical for high-inertia turbomachinery.
- Seamless Dynamix Integration – Native EtherNet/IP connectivity allows the module to share speed data with Allen-Bradley PLCs and FactoryTalk View dashboards without additional gateways.
- Configurable Relay Outputs – Four independently configurable relay outputs support trip, alarm, and auxiliary functions from a single module, reducing panel footprint.
- Wide Sensor Compatibility – Accepts passive magnetic pickups, active proximity probes, and TTL signals, preserving existing sensor investments during retrofits.
- DIN Rail Form Factor – Compact module integrates directly into existing MCC or control panel enclosures without dedicated rack infrastructure.
Complete System Bill of Materials
For a complete over speed protection loop, engineers typically specify the following alongside the 1440-REX03-04RG:
- Speed sensors: Bently Nevada 330180 or equivalent passive magnetic pickup
- Proximity probe driver: 3300 XL 8mm proximity transducer system
- 24 VDC DIN rail power supply: Allen-Bradley 1606-XLP series
- EtherNet/IP managed switch: Stratix 2000 or 5400 series
- Safety relay expansion: 1440-REX series companion modules as required
- Shielded instrumentation cable: Belden 9501 or equivalent (twisted pair, 100 Ω)
Compliance & Industry Standards
- IEC 61511 – Functional Safety: Safety Instrumented Systems for the Process Industry
- API 670 – Machinery Protection Systems (overspeed trip requirements)
- IEC 61508 SIL 2 capable (with appropriate system architecture)
- CE Marking – European Machinery Directive 2006/42/EC
- UL Listed – UL 508 Industrial Control Equipment
- RoHS Compliant
Quality Assurance & Sourcing
Konmask.com sources the Allen-Bradley 1440-REX03-04RG exclusively through authorized distribution channels and verified industrial surplus networks. Every unit undergoes the following before dispatch:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Label and date-code verification against Rockwell Automation authenticity standards
- Functional power-on test where applicable
- Anti-static packaging with humidity indicator card
- Certificate of conformance available upon request
How to Source This Part
Add the 1440-REX03-04RG to your cart and proceed to checkout. For bulk orders (>5 units), OEM project pricing, or expedited freight requirements, contact our industrial sales team directly:
- Email: support@konmask.com
- Phone/WhatsApp: +0086 19859288691
- Lead Time: In-stock units ship within 1–3 business days; special-order lead times quoted on request.
- Export: We ship globally with full export documentation (commercial invoice, packing list, COO).
Application-Specific FAQ
Q: Can the 1440-REX03-04RG replace a Bently Nevada 3500/53 overspeed detection module?
A: The 1440-REX03-04RG serves the same functional role (overspeed trip relay) but uses the Dynamix/EtherNet/IP ecosystem rather than the 3500 rack backplane. A signal conditioning adapter may be required for direct sensor reuse. Contact us for a compatibility assessment.
Q: Is this module suitable for SIL 2 safety loops?
A: Yes, when installed in a 2oo3 voting configuration per IEC 61511 requirements and with a documented safety lifecycle, the system can achieve SIL 2. Consult your functional safety engineer for the full LOPA and SIL verification.
Q: What is the maximum speed this module can monitor?
A: The 1440-REX03-04RG supports speed inputs up to 99,999 RPM, covering the full range of industrial turbomachinery including high-speed centrifugal compressors.
Q: Does the module require a Dynamix rack or can it be used standalone?
A: The module is designed for DIN rail mounting and can operate standalone for relay trip functions. EtherNet/IP integration with a Dynamix or ControlLogix system is optional but recommended for full diagnostic visibility.
Q: Can I get a datasheet or wiring diagram?
A: Yes. Email support@konmask.com with your inquiry and we will provide the Rockwell Automation publication 1440-UM001 user manual and relevant wiring diagrams.
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Contact: support@konmask.com | +0086 19859288691
