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Key Technical Specifications
| Parameter | Specification |
| Part Number | 51303940-250 |
| Alternate Part Number | MC-FAN511 / Rittal 9967296 |
| Operating Voltage Range | 170–264 V AC (50/60 Hz) |
| Current Draw | 0.5 A nominal |
| Airflow Capacity | ~120 CFM per fan unit |
| Alarm Signaling | Integrated air-pressure switch / current sensor (Dry Contact output) |
| Noise Level | \le 45 dBA |
| Operating Temperature | -10^\circC to +60^\circC |
| Bearing Type | Sealed Precision Dual Ball Bearing |
| Enclosure Compatibility | Honeywell Universal Control Network (UCN) / High-Performance Process Manager (HPM) Enclosures |
| Mounting Orientation | Horizontal / Cabinet Top Exhaust Array |
| Dimensions & Weight | 5.1 \times 26.7 \times 17.8 cm; Approx 1.1 kg |
Product Introduction & Supply Chain Strategy
The Honeywell 51303940-250 is an essential cabinet cooling fan assembly equipped with a built-in alarm sensor, designed specifically for Honeywell TDC 3000 and Experion PKS DCS system enclosures. It provides active forced-air ventilation across card cages to dissipate heat from high-density I/O modules, power supplies, and node processors, while continuously broadcasting cooling circuit status to system alarm monitoring panels.
Securing this part as New Surplus guarantees maximum operational lifespan without risking internal bearing drag or alarm circuit degradation common in aged equipment. Overheating due to fan failure in a DCS cabinet can cause thermal throttling, component drift, and catastrophic module failure. Sourcing factory-fresh New Surplus units minimizes Total Cost of Ownership (TCO) by providing OEM reliability at a fraction of standard lead-time delays, mitigating downtime risks for mature legacy control systems.
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Safety First: Verify cabinet power supplies and execute proper Lock-Out/Tag-Out (LOTO) procedures on the fan supply breaker (typically 220V AC).
- PPE Preparation: Put on an ESD wrist strap grounded to the cabinet frame before touching any adjacent system backplane components.
- Pre-Inspection: Check the replacement unit’s wiring harness, housing, and terminal connectors for shipping damage.
Stage 2: Removal
- Unplug the AC power supply connector from the fan tray.
- Disconnect the dry-contact alarm signal harness leading to the cabinet monitoring circuit.
- Loosen the retaining screws securing the 51303940-250 module to the cabinet frame and pull the tray straight out, taking care not to snag surrounding internal cables.
Stage 3: Installation (Clone & Seat)
- Slide the new 51303940-250 unit carefully into the mounting rack guides.
- Secure the retaining fasteners tightly to prevent mechanical vibration noise.
- Reattach the alarm signal harness firmly to ensure continuous circuit contact.
- Connect the main AC power harness to the module input port.
Stage 4: Power-On & Testing
- Re-energize the fan AC circuit breaker.
- Verify that all fan impellers spin smoothly and quietly without friction noise.
- Confirm that the cabinet alarm LED clears on the local status panel and that no fan-fault conditions appear on the DCS operator console.
51303940-250
51303940-250
Firmware/Software Versions & Upgrade Notes
- Firmware/Hardware Dependency: The 51303940-250 is a electro-mechanical thermal assembly with an integrated hardware alarm contact circuit; it does not carry onboard flash software.
- System Backward/Forward Compatibility: Compatible with all Honeywell UCN, HPMM, and Experion cabinet architectures utilizing 220V AC fan tray bays.
- Hardware Revision Advisory: Always verify voltage specifications on the cabinet tag plate before installation. Ensure you are replacing a 220V unit (51303940-250) rather than a 110V variant (such as 51303940-100) to prevent blown fuse conditions or insufficient airflow.
Frequently Asked Questions (FAQ)
Q: Is this Honeywell 51303940-250 unit brand new, or has it been pulled from an active plant?
A: This product is guaranteed New Surplus / Original New. It has never been used in an active process plant, repaired, or refurbished. It originates from verified surplus channels and remains in original, factory-clean condition with zero operating wear.
Q: Why should I buy New Surplus instead of a cheaper refurbished fan tray?
A: Refurbished fan assemblies often retain worn ball bearings and aging fan motors that have already suffered thousands of thermal hours. A failed fan can lead to cabinet overheating, causing multi-module shutdowns that cost tens of thousands of dollars per hour in lost production. Buying New Surplus provides full operational lifespan and peace of mind at a cost well below OEM list prices.
Q: Does this model include an integrated alarm sensor?
A: Yes. The 51303940-250 features an integrated alarm monitoring mechanism that closes/opens a dry contact when airflow drops below operational thresholds or when power to the fans is lost.
Q: Can I hot-swap this cabinet fan assembly while the DCS is running?
A: While the fan assembly can technically be removed physically without shutting down the controller logic, extreme care must be taken when working near live 220V AC wiring. Additionally, removing the fan tray reduces cooling; swap the assembly quickly (under 5 minutes) to avoid heat accumulation inside the DCS rack.
Q: What warranty coverage comes with this module?
A: We back this New Surplus 51303940-250 module with a full 1-year functional warranty from the date of shipment, giving you the same protection level as buying directly from the factory.
