Product details
Product Overview
The 1606-XLSRED is a diode redundancy module from the Allen-Bradley Bulletin 1606-XL series. It combines two 24 V DC power supplies into one reliable 480 W DC bus. Diode decoupling keeps the load powered if one supply fails. This supports true 1+1 redundancy in critical control panels. Spring terminals and DIN rail mounting make wiring fast and service simple. No communication interface is needed, so setup stays lean and predictable.
Technical Data
- Brand: Allen-Bradley
- Model: 1606-XLSRED
- Series: Bulletin 1606-XL
- Module type: Diode redundancy module
- Function: Combines two supplies for 1+1 redundancy with diode decoupling
- Input voltage: DC 9 to 60 V range, nominal DC 12 to 48 V, two inputs
- Output voltage: DC 12 to 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
- Voltage measurement range: DC 9 to 60 V at each input
- Frequency response: Not applicable, DC-only design
- Sensitivity: Not applicable, passive diode path
- Linearity: Not applicable, no regulation stage
- Resolution: Not applicable, no digital conversion
- Temperature range: Not published by the manufacturer
- Environmental tolerance: IP20 protection rating for indoor cabinet use
- Interference immunity: Diode decoupling blocks reverse feed between supplies
- Relative humidity: Not published by the manufacturer
- Storage temperature: Not published by the manufacturer
- Dimensions (H x W x D): 124 x 32 x 102 mm
- Weight: 0.29 kg
- Connection: Spring terminals
- Mounting: DIN rail
- Built-in ports: None
- Protocols: None
- Lifecycle: Active on the official Rockwell product page, last verified 2026-10
Installation Guide
- Snap the unit onto a standard DIN rail inside the control cabinet.
- Feed each 24 V DC supply into a separate input terminal pair.
- Use spring terminals for tool-free, vibration-resistant connections.
- Wire the combined output to the shared DC bus load.
- Keep wiring short to limit the 800 mV voltage drop effect.
- Confirm polarity before power-up to protect the diode path.
Setup and Maintenance Ease
- No configuration steps are required after wiring.
- No communication setup or firmware updates are needed.
- Spring terminals speed up replacement and service checks.
- Passive diode design means no wear parts and low upkeep.
- 0 W no-load loss keeps standby power low.
- Compact 32 mm width saves valuable panel space.
Compatibility Notes
- Pairs with two 24 V DC power supplies for 1+1 redundancy.
- Works with nominal DC 12 to 48 V systems within the 9 to 60 V range.
- Fits standard DIN rail assemblies in Bulletin 1606-XL panels.
- Suits loads up to 20 A nominal on the combined bus.
- No bus protocol needed, so it fits legacy and new cabinets alike.
Certification Information
- UL 60950-1 listed
- cUL listed
- CE marked
- Approvals follow the official Bulletin 1606 series standard
Package Contents
- One 1606-XLSRED diode redundancy module
- Mounting and wiring instructions
- Factory packaging with product label
FAQ
Q: What does this module actually do?
A: It joins two 24 V DC supplies into one bus. Diodes stop one supply from feeding back into the other.
Q: Can I use it with a single power supply?
A: Yes, it will pass power. You lose the redundancy benefit that two supplies provide.
Q: How much current can the combined bus carry?
A: The nominal output is 20 A. Short-circuit peaks may reach 25 A.
Q: Does it need any software or configuration?
A: No. It has no ports and no protocols. Wiring is the whole setup.
Q: What is the voltage drop across the module?
A: About 800 mV. Plan your bus voltage with this loss in mind.
Q: Why is the operating temperature not listed?
A: Rockwell does not publish a numeric value for this model. Check the cabinet thermal design instead.
Q: From experience, what is the most common install mistake?
A: Reversed input polarity. Check each terminal pair with a meter before you energize the bus.
Q: From experience, how do teams verify redundancy works?
A: Switch off one supply under light load. The bus should hold steady with no dip at the load.
Q: From experience, when should I replace the unit?
A: Only after a fault. There are no wear parts, so age alone is not a reason to swap it.
Q: Is the module still available?
A: Yes. Rockwell lists it as active, last verified in October 2026.
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