Allen-Bradley 1606-XL120E-3 Power Supply

Product Introduction

The 1606-XL120E-3 belongs to the Allen-Bradley Bulletin 1606-XL family of switched-mode power supplies. This model accepts a three-phase AC input and provides a regulated 24 V DC output for industrial control circuits. Specifically, it delivers 5 A at 24 V, which translates to a rated power of 120 W. The unit mounts on a standard DIN rail and uses screw terminals for wiring. However, Rockwell Automation has officially discontinued this series, with end of sale on December 31, 2020. Therefore, buyers should verify availability and consider the engineering replacement, the 1606-XL120DR, for new designs. The information below helps maintenance teams and system integrators evaluate spare-part compatibility.

Technical Specifications

The electrical performance of the 1606-XL120E-3 centers on a wide-range three-phase input and an adjustable output. Input voltage accepts 3-phase 400–500 V AC, with an operational range of 340–576 V AC. Additionally, the unit tolerates DC input from 450 to 820 V. The output voltage is adjustable from 24 to 28 V DC and arrives preset at 24.5 V. At 24 V, the supply provides 5 A; at 28 V, the current derates to 4.3 A. Ripple and noise stay below 25 mVpp, which helps sensitive control electronics. Efficiency reaches up to 88.8%, and the unit can briefly supply a 20% power boost (up to 6 A) for startup loads.

Input and Output Behavior

A key trait of this supply is phase-loss tolerance. Even if one phase fails, the 1606-XL120E-3 continues to deliver nominal current, though harmonic emission compliance and hold-up time degrade. Continuous two-phase operation is also permissible but shortens the unit's lifetime. For protection, Rockwell recommends 10 A slow-acting fuses (three pieces) or supplementary protector 1492-SP3C100 on the primary side. Output voltage regulation stays better than 2% overall.

Mechanical and Environmental Parameters

The supply measures 124 mm in height, 73 mm in width, and 117 mm in depth. It weighs 730 g. The open-frame construction carries an IP20 rating, so the unit belongs inside an enclosure that keeps out dust and moisture. Operating temperature spans -10 to +70 °C, but output power derates above 60 °C. Storage temperature and relative humidity are not published in the official Bulletin 1606 selection guide for this model. Approvals include UL 60950-1, cUL, and CE marking.

Mounting and Wiring Notes

DIN rail mounting follows the standard 35 mm profile common to Bulletin 1606 supplies. The screw terminals accept standard industrial wire sizes. Furthermore, the front-panel potentiometer sits under a cover; technicians can adjust output voltage within the 24–28 V range without exposing the setting to accidental changes. Because the supply has no communication ports or protocols, commissioning requires only input power and output load connections.

Installation Guide

First, verify that the three-phase supply voltage falls within the continuous operating window of 340–576 V AC. Next, mount the 1606-XL120E-3 on a grounded DIN rail inside a protective enclosure. After that, connect the three input phases through the recommended 10 A fuses or circuit breaker. Then wire the output terminals to the 24 V DC load, observing polarity. Finally, apply input power and measure the output at the terminals; adjust the potentiometer only if the load requires a voltage other than 24.5 V. Keep clearance around the unit for convection cooling, especially when operating near the 60 °C derating threshold.

Packaging List

• 1 × Allen-Bradley 1606-XL120E-3 Power Supply Unit

• 1 × Original Protective Carton

• 1 × Installation Reference Sheet (if included by the supplier)

Shipping: Fedex, UPS, DHL.

FAQ

Q1: Is the 1606-XL120E-3 still available from Allen-Bradley?
No. Rockwell Automation discontinued the Bulletin 1606-XL series, and end of sale was December 31, 2020. The engineering replacement is the 1606-XL120DR. Availability today comes from surplus and spare-part channels.

Q2: Can this supply run on two phases if one phase is lost?
Yes, the 1606-XL120E-3 continues operating at nominal current with one phase missing. However, harmonic current compliance and hold-up time are affected, and long-term two-phase operation reduces reliability and lifetime.

Q3: What output current can I expect at 28 V?
At the upper end of the adjustment range, output current derates to 4.3 A. The full 5 A rating applies at 24 V DC.

Q4: Does the 1606-XL120E-3 have any communication ports?
No. This model provides no communication interface, no protocols, and no built-in ports. It is a standalone analog power supply with screw terminals only.

Q5: What is the recommended input protection?
Rockwell suggests three 10 A slow-acting fuses (HBC type) or a supplementary protector, catalog number 1492-SP3C100, on the primary side. Always confirm against local electrical codes before installation.