1606-XL120DR – Allen-Bradley Redundant Power Supply, 24 V DC, 120 W, Decoupling Diode
The 1606-XL120DR is a legacy redundant supply from the Allen-Bradley 1606-XL line. A built-in decoupling diode lets two units share one 24 V DC bus. If one unit drops, the other keeps the load alive. Output is 120 W at 5 A. Input spans 85 to 264 V AC single phase. A DC OK relay reports status. Rockwell discontinued this model on December 31, 2020, with no planned direct replacement. Oiltech Controls supplies tested units for existing redundant pairs.
Identity and Lifecycle
- Model: 1606-XL120DR
- Brand: Allen-Bradley
- Series: Bulletin 1606-XL
- Status: discontinued December 31, 2020
- Replacement: none planned by Rockwell
Redundancy Architecture
- Integrated decoupling diode on the output
- Parallel-capable soft output characteristic
- DC OK relay output for status wiring
- DIN rail mount, open-frame build
- IP20 protection rating
Electrical Ratings
- Input: 85 to 264 V AC, single phase
- Output: 24 V DC nominal
- Current: 5 A nominal
- Rated power: 120 W
- No communication port or protocol
Temperature and Physical Data
- Operating temperature: -10 to +70 °C
- Storage temperature: not published by maker
- Relative humidity: not published by maker
- Body size: 124 × 64 × 102 mm
- Weight: 0.62 kg
Oiltech Controls Review
- The decoupling diode is the key part. It blocks reverse feed when one unit fails.
- Keep both units on the same input class for balanced load sharing.
- Soft output characteristic eases parallel startup.
- Discontinued status makes spare stock the main risk. Hold a spare.
- Check the DC OK relay wiring during any service visit.
Where It Fits Best
-
- Legacy redundant 24 V DC pairs on process lines
- Control cabinets that need uptime without bus cuts
- Retrofits where the rack layout cannot change
- Machines with no direct Rockwell replacement path
- Spare-part stores supporting obsolete panels
Why Buy From Oiltech Controls?
- Over 15 years of automation spare parts experience
- Global shipment support
- Tested industrial surplus and refurbished options
- 12-month warranty on every order
- Technical verification before shipment
- Support for obsolete control systems
Delivery and Contact
- Ships within 24 to 28 hours
- Couriers: FedEx, UPS, DHL
- Warranty: 12 months
- Email: info@oiltechcontrols.com
- WhatsApp: +86 158 8020 0923
FAQ
Q: Can I use this unit alone, without a second supply?
A: Yes. It runs as a normal 24 V DC supply. You only gain redundancy when you pair it with a second decoupled unit.
Q: Does the partner unit need to be the same model?
A: Best practice is a matched pair. A different model needs its own decoupling diode. Check output trim and load sharing before you connect both.
Q: How do I handle the discontinued status?
A: Keep one tested spare per critical panel. Plan a migration path before both units age out. We support obsolete systems and can cross-check alternatives.
Q: What should I verify on arrival?
A: Check output at 24 V DC under a small load. Ring out the DC OK relay. Confirm the diode blocks reverse feed. Send us a photo if readings look off.
Q: Can I mix a new unit with an old one in a redundant pair?
A: Usually yes, if output trim and characteristic match. Set both to the same voltage. Watch load sharing for the first hours of run time.
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