Product Overview

The Allen-Bradley 1606-XLP50B Power Supply is a compact switched-mode power supply designed to provide regulated DC power for industrial automation and electrical control systems. Part of the Bulletin 1606-XLP series from Rockwell Automation, this unit converts a wide-range AC or DC input into a stable low-voltage DC output for compatible control equipment and auxiliary electrical devices.

Industrial automation systems depend on reliable power distribution. PLC controllers, sensors, relays, communication devices, and other control components require a suitable DC supply to operate consistently. The 1606-XLP50B provides a 50 W output and an adjustable voltage range of 12–15 V DC, making it suitable for applications that require a compact 12 V-class power source.

The unit accepts a single-phase AC input from 100 to 240 V AC and also supports a DC input range of 85–375 V DC. Its nominal output current is 4.2 A at 12 V DC and 3.4 A at 15 V DC. This adjustable output provides flexibility when supplying equipment with different voltage requirements within the specified operating range.

The 1606-XLP50B is designed for DIN-rail installation and uses spring-clamp terminals for electrical connections. Its compact housing helps reduce the space required inside industrial control cabinets. With typical efficiency of approximately 90%, the power supply is designed to limit conversion losses during normal operation.

This model is particularly relevant to control panels and automation systems that need a compact, regulated DC supply. Before installation, engineers should verify the required output voltage, current demand, input supply, and electrical protection requirements of the connected equipment.

Technical Specifications

Dimensions and weight are the supplied listing values. The manufacturer’s published weight is approximately 0.26 kg.

Function and Working Principle

The 1606-XLP50B uses switched-mode power conversion to transform incoming electrical power into a regulated DC output. This process allows the unit to supply low-voltage control equipment from a wider AC or DC input source.

1. AC/DC Input Conversion

The power supply accepts a single-phase AC input between 100 and 240 V AC. It can also operate from a supported DC input source within its specified range.

The input stage processes the incoming electrical energy before the switching and regulation stages convert it into the required DC output. This wide input capability allows the power supply to be used in different industrial electrical environments.

The input voltage must remain within the manufacturer’s permitted operating limits. Incorrect wiring or an unsuitable supply can damage the unit and connected equipment.

2. Regulated DC Output

The 1606-XLP50B provides an adjustable output voltage from 12 to 15 V DC. The output is designed to remain regulated under normal operating conditions when the input and load are within the specified limits.

At 12 V DC, the rated output current is 4.2 A. When the output is adjusted to 15 V DC, the available rated current is 3.4 A.

This relationship allows the unit to supply different types of low-voltage equipment, provided that the total load remains within the 50 W output rating.

3. Switching Regulation

Switched-mode power supplies use high-frequency switching and electronic regulation to control energy conversion. Compared with traditional transformer-based linear supplies, this approach can provide a more compact design and improved efficiency.

The switching circuit continuously manages energy transfer to maintain the required output voltage as the input and load conditions change within the rated operating range.

4. Output Voltage Adjustment

The output can be adjusted within the specified 12–15 V DC range. This is useful when connected equipment requires a voltage other than the nominal 12 V output.

The adjustment should be performed according to the manufacturer’s instructions. Before connecting sensitive devices, verify the output voltage with suitable measuring equipment.

5. Power Conversion Efficiency

The typical efficiency is approximately 90%. Efficient conversion reduces internal power losses and helps limit heat generation inside the control cabinet.

Actual efficiency depends on input voltage, output load, ambient temperature, and operating conditions. Proper ventilation remains important even when the power supply operates efficiently.

Role in Industrial Control Systems

The 1606-XLP50B provides DC power for suitable electrical and automation components. It can be installed in a control cabinet as part of the auxiliary power distribution system.

PLC and Controller Support

Some automation installations use 12 V DC auxiliary circuits for specific control devices. The power supply can provide a regulated source for compatible equipment, provided that its voltage and current requirements fall within the rated output.

The PLC’s own power requirements must be checked separately. A 12 V supply should not be connected to a controller that requires 24 V DC or another voltage.

Sensor and Instrument Power

Industrial sensors and measurement devices may require regulated low-voltage DC power. The 1606-XLP50B can supply compatible devices when their combined current demand does not exceed the power supply’s rated capacity.

For installations with multiple sensors, engineers should calculate the total load and allow suitable operating margin.

Relay and Interface Circuits

Auxiliary relay circuits, signal-conditioning devices, and interface equipment may require a dedicated DC supply. The 1606-XLP50B can support compatible circuits when their coil voltage and operating current match the available output.

The correct polarity, wiring method, and protection arrangement should be confirmed before connecting these devices.

Communication and Control Equipment

Certain communication accessories and low-voltage control devices use 12 V DC power. The power supply can support these loads when their electrical specifications are compatible.

It should not be assumed that every PLC communication module or industrial network device accepts 12 V DC. Always verify the equipment’s rated supply voltage.

Industrial Applications

The compact design and adjustable DC output make the 1606-XLP50B suitable for a range of low-voltage industrial power applications.

1. Industrial Control Cabinets

Control cabinets contain a variety of electrical and electronic components that require reliable auxiliary power. The 1606-XLP50B can be installed on a DIN rail to supply compatible 12 V DC circuits.

Its narrow housing helps conserve panel space, especially in cabinets containing multiple terminal blocks, relays, and control devices.

2. PLC Auxiliary Circuits

Some PLC installations use separate auxiliary power supplies for peripheral devices. The 1606-XLP50B can supply compatible 12 V DC equipment without requiring the main controller supply to power every auxiliary load.

The output must be matched to the actual voltage requirements of each connected device.

3. Sensor and Signal Systems

Industrial sensors, signal converters, and selected measurement devices may require a stable 12 V DC source. The adjustable output allows the supply voltage to be configured within the permitted range.

When several devices share one supply, engineers should calculate the total current demand and consider startup current and operating conditions.

4. Relay and Interface Panels

Relay panels and interface cabinets may contain low-voltage circuits for signal switching and auxiliary control. The 1606-XLP50B can provide power for compatible relays and interface components.

The relay coil voltage and current must be checked before connecting the supply.

5. Small Automation Machines

Compact machines may require a dedicated DC supply for sensors, indicators, control interfaces, or other auxiliary equipment. The 50 W output capacity can support suitable low-power loads.

Applications with larger current requirements should use a power supply with an appropriate higher output rating.

6. Industrial Equipment Maintenance

The 1606-XLP50B may be used as a replacement component in existing Bulletin 1606 installations. When replacing an existing unit, confirm the required output voltage, available current, input range, mounting arrangement, and terminal wiring.

A power supply with the same physical dimensions but a different output voltage is not necessarily a suitable replacement.

Installation and System Integration

Correct installation is essential for safe operation and reliable DC power distribution.

1. Verify the Input Supply

Before installation, confirm that the incoming source is within the supported range:

• AC input: 100–240 V AC nominal.
• AC operational range: 85–264 V AC.
• DC input: 85–375 V DC.
• Single-phase AC supply.

Check the actual electrical source and wiring arrangement before energizing the unit. Do not connect a supply that exceeds the specified limits.

2. DIN-Rail Mounting

The 1606-XLP50B is designed for DIN-rail installation. Its compact dimensions of 91 × 45 × 75 mm help simplify installation in smaller control cabinets.

Mount the power supply securely and maintain the manufacturer’s recommended ventilation clearances. Avoid obstructing the ventilation openings.

3. Electrical Connections

The unit uses spring-clamp terminals. Conductors should be prepared according to the manufacturer’s specified wire size and stripping requirements.

Keep input and output wiring correctly identified. Verify polarity before connecting the DC output to control devices.

Electrical installation should be carried out by qualified personnel using suitable isolation and safety procedures.

4. Set the Output Voltage

The output voltage can be adjusted between 12 and 15 V DC. Select a setting appropriate for the connected equipment.

After adjustment, measure the output voltage before connecting sensitive electronic devices. Confirm that the voltage remains within the permitted range under the expected load.

5. Calculate the Load

The maximum rated output power is 50 W. The load must remain within the applicable voltage and current limits.

For example, a 12 V load drawing 3 A requires:

12 V × 3 A = 36 W

This is within the 50 W power rating, provided that other operating conditions and current limits are also satisfied.

For multiple connected devices, calculate their combined current demand and allow an appropriate margin.

6. Grounding and Protection

Follow the manufacturer’s grounding and wiring instructions. Provide appropriate upstream circuit protection and ensure that the installation complies with applicable electrical codes.

The IP20 enclosure is intended for protected installation environments. If the cabinet is exposed to dust, moisture, or other contaminants, suitable enclosure protection must be provided.

7. Commissioning and Testing

After installation, inspect all wiring and terminal connections. Energize the power supply under controlled conditions and measure the DC output.

Check the output voltage under the expected load and monitor for abnormal temperature rise, noise, or unstable operation. Confirm that all connected equipment receives the correct supply voltage before returning the system to normal service.

Compatible System Components

The 1606-XLP50B can be used with compatible low-voltage equipment in an industrial control system.

These are examples of equipment that may be used with the power supply. They are not necessarily included with the 1606-XLP50B.

Alternative Models and Replacement Considerations

The Bulletin 1606 family includes several compact power supplies with different output voltages and current ratings. Replacement selection should be based on electrical requirements rather than physical appearance alone.

Before selecting an alternative, check:

• Input voltage and frequency.
• AC or DC input requirements.
• Output voltage range.
• Rated output current.
• Total load power.
• Terminal arrangement.
• DIN-rail mounting dimensions.
• Operating temperature and ventilation.
• Required approvals and installation standards.

A 24 V DC replacement, for example, cannot directly replace a 12 V DC supply if the connected equipment is designed for 12 V operation.

Key Advantages

Compact DIN-Rail Design

The narrow housing helps save space in industrial control cabinets and makes the unit suitable for installations with limited panel space.

Wide Input Voltage Range

The supply accepts 100–240 V AC and supports a specified DC input range, providing flexibility across different industrial electrical environments.

Adjustable DC Output

The 12–15 V DC adjustment range allows the output to be configured for compatible low-voltage equipment.

50 W Output Capacity

The 50 W rating provides power for suitable sensors, interface circuits, relays, and auxiliary control devices.

Efficient Switching Technology

Typical efficiency of approximately 90% helps reduce conversion losses and unnecessary heat generation.

Spring-Clamp Connections

Spring-clamp terminals support convenient electrical installation and provide secure conductor connections when installed correctly.

Industrial Installation Design

The IP20 housing and DIN-rail mounting arrangement are intended for protected industrial control-panel environments.

Technical FAQs

1. What is the Allen-Bradley 1606-XLP50B?

The 1606-XLP50B is a compact switched-mode power supply from the Bulletin 1606-XLP series. It provides regulated 12–15 V DC output for compatible industrial control equipment.

2. What is the rated output power?

The rated output power is 50 W.

3. What is the output current?

The rated output current is 4.2 A at 12 V DC. At 15 V DC, the rated current is 3.4 A.

4. What input voltage does the 1606-XLP50B support?

It supports 100–240 V AC single-phase input and a DC input range of 85–375 V DC. The AC operational range is 85–264 V AC.

5. Can the output voltage be adjusted?

Yes. The output can be adjusted from 12 to 15 V DC. The setting should be selected according to the connected equipment’s rated voltage.

6. How is the power supply installed?

The 1606-XLP50B is designed for DIN-rail mounting inside an appropriate electrical cabinet. Follow the manufacturer’s mounting, ventilation, and wiring instructions.

7. Does it support 24 V DC output?

No. Its adjustable output range is 12–15 V DC. A different model with a 24–28 V DC output is required for equipment that specifically needs 24 V DC.

8. What is the protection rating?

The power supply has an IP20 protection rating. It should be installed in a suitable cabinet where protection against water and environmental contaminants is required.

9. Can it power multiple industrial devices?

Yes, provided that all connected devices accept the selected output voltage and their combined power and current demand remain within the supply’s rated limits. Load calculations should include appropriate operating margin.

10. What should be checked before purchasing a replacement?

Confirm the complete model number, input range, output voltage, current rating, power capacity, mounting dimensions, and terminal arrangement. Also inspect the product condition and verify that it matches the requirements of the existing installation.

Procurement and Maintenance Recommendations

When sourcing the Allen-Bradley 1606-XLP50B, verify the complete catalog number and inspect the product label. The 1606-XLP family includes models with different output voltages and power ratings, so similar-looking units should not be treated as interchangeable.

For replacement projects, compare the original power supply’s input voltage, output voltage, current requirement, terminal arrangement, and mounting dimensions. Confirm that the replacement can support the total load without exceeding its rated capacity.

For used or surplus units, request clear photographs of the label and terminals. Check for damaged housing, loose terminals, corrosion, contamination, or other visible signs of deterioration. Where possible, request a functional test that confirms stable output under load.

During routine maintenance, inspect the power supply and surrounding cabinet for dust accumulation, obstructed ventilation, loose conductors, and abnormal heat. Check the DC output voltage periodically, particularly when connected equipment begins showing intermittent faults or unstable operation.

Keep the power supply within its rated operating conditions and avoid connecting loads that exceed the available output power. If a system requires additional capacity, evaluate a suitably rated power supply rather than operating the unit continuously beyond its specifications.

Conclusion

The Allen-Bradley 1606-XLP50B Power Supply is a compact 50 W switched-mode power supply designed for industrial control and auxiliary power applications. It accepts 100–240 V AC single-phase input or a supported DC input and provides an adjustable 12–15 V DC output.

With a rated output of 4.2 A at 12 V DC, DIN-rail mounting, spring-clamp terminals, and a compact housing, the 1606-XLP50B is suitable for compatible low-voltage control devices and industrial electrical systems.

For installation and replacement, the most important considerations are input compatibility, output voltage, current capacity, load calculation, ventilation, and correct terminal wiring. Verifying these parameters helps ensure reliable operation in industrial control cabinets.