1606-XLB120E Switched-Mode Power Supply Allen-Bradley 1606-XL Unit

Power Conversion Architecture & Overview

The Allen-Bradley 1606-XLB120E is a high-efficiency 120W switched-mode DIN-rail power supply engineered within the reliable 1606-XL product family. Designed for industrial control cabinets, it features an autoselect AC input stage supporting 100V–120V / 200V–240V nominal lines (50/60 Hz), delivering a clean, regulated DC output adjustable from 24V to 28V at a continuous 5A rating. With peak efficiencies reaching up to 92.3% and minimal thermal dissipation, it provides stable power delivery for critical automation hardware.

Automation engineers specify the 1606-XLB120E power module for compact control panels where high power density, built-in DC-OK relay monitoring, and robust electromagnetic compatibility (EMC) are essential for continuous uptime.

Comprehensive Technical Parameters Table

• Brand Manufacturer: Allen-Bradley (Rockwell Automation)
• Product Series: 1606-XL Switched-Mode Power Supply Family
• Part Number / Model: 1606-XLB120E
• Nominal DC Output Voltage: DC 24V to 28V adjustable
• Nominal Output Current: 5.0A at 24V DC / 4.3A at 28V DC (120W total capacity)
• Output Ripple & Noise: 100 mVpp maximum
• Input Voltage Range: Autoselect AC 100–120V / 200–240V (±10% tolerance)
• Input Frequency: 50 Hz / 60 Hz (±6% tolerance)
• Input Current (120V / 230V AC): 1.71A / 1.05A typical
• Power Factor & Efficiency: PF 0.64 / 0.54; Efficiency up to 91.2% (120V) and 92.3% (230V)
• Inrush Current (Peak): 22A at 120V AC / 33A at 230V AC
• Operational Temperature Range: -10°C to +70°C (with thermal derating of 3W/°C above +50°C/+55°C)
• Storage Temperature Range: -40°C to +85°C
• Terminal Specifications: 0.5–4 mm² stranded / 0.5–6 mm² solid wire (20–10 AWG); 7 mm stripping length; 1 Nm (9 lb·in) torque
• Diagnostic Features: Integrated DC-OK relay contact output included
• EMC Compliance: IEC 61000-6-1/2 immunity; IEC 61000-6-3/4 emissions; EN 55011/22 Class B
• Physical Dimensions (W x H x D): 39 mm x 124 mm x 124 mm (excluding DIN rail)
• Unit Net Weight: 370 g (0.81 lbs) maximum

Global PLC Spare HUB's Insight

According to Global PLC Spare HUB's Insight, proper thermal management is crucial when deploying compact 120W supplies like the 1606-XLB120E in densely packed enclosures. Field technicians note that ignoring the 3W/°C output derating curve above +50°C/+55°C ambient temperature can lead to premature power supply thermal foldback. Ensuring adequate horizontal spacing between adjacent DIN-rail components prevents localized hot spots and guarantees long-term electrolytic capacitor lifespan.

Target Industrial Equipment & Application Scenarios

• PLC & Controller Racks: Powers Allen-Bradley ControlLogix and CompactLogix processor chassis reliably.
• Distributed I/O Drops: Supplies 24V DC power to remote input/output terminal blocks across automated assembly cells.
• HMI Operator Terminals: Energizes touchscreens and industrial panel PCs in factory floor control stations.
• Sensor & Actuator Loops: Drives photoelectric sensors, inductive proximity switches, and solenoid valve islands.
• Relay Control Cabinets: Powers auxiliary safety relays, intermediate control blocks, and indicator light circuits.

Diagnostic Capabilities & Output Monitoring

The 1606-XLB120E incorporates built-in hardware monitoring features to assist maintenance personnel during troubleshooting:

• DC-OK Relay Output: Provides dry contact feedback to alert upper-level PLC logic if output voltage drops below nominal operating thresholds.
• Front Panel LED Status: Visual green LED indicator confirms active secondary DC voltage generation and regulation.
• Overload & Short-Circuit Protection: Electronic current limitation protects downstream circuits against sudden load faults without blowing internal fuses.

Express Logistics & 12-Month Warranty Coverage

• Warranty Terms: Backed by a comprehensive 12-month replacement warranty covering manufacturer defects.
• Dispatch Lead Time: Rapid order processing and secure worldwide dispatch within 24 to 48 hours.
• Global Carriers: Express international delivery managed through FedEx, UPS, and DHL.

Professional Frequently Asked Questions (FAQ)

Q1: Does the 1606-XLB120E power supply require manual voltage range selection between 120V and 230V?

A1: No, the 1606-XLB120E unit features an autoselect input stage that automatically adjusts to AC 100–120V or AC 200–240V nominal supply lines.

Q2: How should I account for ambient temperature when sizing this 120W power supply for my cabinet?

A2: If your enclosure internal temperature exceeds +50°C or +55°C, you must apply the 3W/°C output derating factor to calculate the actual usable wattage safely available from the unit.

Q3: What is the purpose of the DC-OK contact on this power supply?

A3: The DC-OK contact provides a hardwired diagnostic signal to your control system, changing state to indicate whether the output voltage has dipped out of regulation.

Q4: What wire gauge and tightening torque are recommended for secure terminal block connections?

A4: Use copper wire ranging from 20 to 10 AWG (0.5–4 mm² stranded or 0.5–6 mm² solid), strip exactly 7 mm of insulation, and torque terminal screws to 1 Nm (9 lb·in).

Q5: What purchasing guidelines ensure optimal selection when replacing obsolete Allen-Bradley power units?

A5: When selecting a replacement, verify that your total continuous load current stays well within the 5.0A limit, and match the exact physical dimensions (39mm width) to ensure it fits your existing DIN-rail layout.

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