1606-XLSRED is the Allen-Bradley Bulletin 1606-XL diode redundancy module. It couples two 24 V DC supplies into one 1+1 redundant DC bus. Diode decoupling prevents one supply from back-feeding the other. Each input accepts 10 A nominal. The combined bus delivers 20 A nominal and handles 25 A short-circuit maximum. The module supports a 480 W DC bus and mounts on DIN rail with spring terminals.
Key Hardware Facts
- Model: 1606-XLSRED — Bulletin 1606-XL diode redundancy module
- Brand: Allen-Bradley
- Function: combines two 24 V DC supplies for 1+1 redundancy
- Decoupling: diode decoupling, no active control
- Connection: spring terminals
- Mounting: DIN rail
- Weight: 0.29 kg
Electrical Ratings
- Input voltage: DC 9–60 V range, nominal DC 12–48 V, two inputs
- Output voltage: DC 12–48 V nominal combined bus
- Input current: 10 A nominal per input
- Output current: 20 A nominal, 25 A short-circuit maximum
- Rated power: 480 W
- Voltage drop: 800 mV
- Power losses: 0 W no-load, 17.0 W at nominal load
Environmental and Physical Notes
- Operating temperature: not published by manufacturer
- Storage temperature: not published by manufacturer
- Relative humidity: not published by manufacturer
- Protection rating: IP20, DIN-rail open-frame construction
- Dimensions (H×W×D): 124 × 32 × 102 mm (listed as 32×124×102 in 1606-TD002)
- Confirm cabinet thermal design against the 17.0 W nominal loss.
Communication and Diagnostics
- Built-in ports: none
- Protocols: none
- No status signal output. Redundancy is passive and purely diode-based.
- Verify supply health at the source. This module gives no alarm contact.
Approvals and Lifecycle
- Approvals: UL 60950-1, cUL, CE marked, per Bulletin 1606 series standard
- Lifecycle: Active on the official Rockwell product page (last verified 2026-10)
- Active status supports long-term spare planning.
Suitable Equipment
- Panels needing 1+1 redundant 24 V DC power for PLC and I/O racks
- Systems where a single supply failure must not stop the line
- Bulletin 1606-XL supply pairs feeding a common DC bus
- Retrofit cabinets adding redundancy without changing existing supplies
- Installations with DIN rail space limited to 32 mm width
Oiltech Controls Review
- The 800 mV voltage drop is the first number to check. Set supply output to offset it.
- 10 A per input caps each supply branch. Size supplies to this limit.
- Diode decoupling is simple and robust. No control logic to fail.
- There is no alarm contact. Plan separate supply monitoring.
- The 17.0 W loss at load is real heat. Account for it in cabinet airflow.
- 32 mm width and 0.29 kg make it easy to fit in tight panels.
- Manufacturer temperature data is missing. Ask us for guidance before high-temperature use.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts supply
- Global shipping via FedEx, UPS, and DHL
- Tested industrial surplus and refurbished options
- 12-month warranty included
- Technical verification before shipment
- Support for obsolete control systems
- 24–28 hour dispatch after order confirmation
Shipping and Warranty Terms
- 24–28 hour dispatch after payment confirmation.
- Carriers: FedEx, UPS, and DHL.
- 12-month warranty covers functional defects.
- Warranty excludes reverse polarity, overload, and wrong input voltage.
- Report shipping damage within 7 days of delivery.
FAQ
Do both inputs need identical power supplies?
Not strictly, but matched supplies share load evenly. Mixed models can cause current imbalance. Keep voltage settings close.
How do I compensate for the 800 mV drop?
Raise supply output slightly. For a 24 V bus, set each supply to about 24.8 V. Verify at the load, not at the supply.
Is a 20 A bus enough for my panel?
Add the steady load of all DC devices. Keep it under 20 A nominal. The 25 A figure is short-circuit only, not continuous.
Why is there no temperature rating?
The manufacturer does not publish it. Our team can advise based on field experience. Ask before deploying in hot cabinets.
New or refurbished — which should I pick?
For spare-holding, a tested refurbished unit with 12-month warranty is cost-effective. For new builds, request factory-new stock. Both dispatch in 24–28 hours. Email info@oiltechcontrols.com or message +86 158 8020 0923 on WhatsApp.
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