Description

• Model: 805405-1R 15A
• Brand: Reliance Electric
• Series: SF3000 / AutoMax Distributed Power System
• Core Function: Supplies regulated DC field excitation for DC motors
• Type: Single-Phase Field Power Module
• Key Specs: 15 A DC output, 120–460 VAC input, non-reversing S2 bridge
• Mounting: Panel mounted
• Application: DC motor field excitation and speed-control systems
• Lifecycle: Legacy / discontinued; replacement stock may depend on inventory

Product Introduction

The Reliance Electric 805405-1R 15A is a panel-mounted single-phase field power module for SF3000 and compatible AutoMax Distributed Power System applications. It provides controlled DC field excitation for DC motors and operates from a 120–460 VAC supply. Rockwell Automation documentation identifies this version as a 15 A, non-reversing S2 module designed for panel mounting.

The module uses a four-SCR full-wave bridge and includes an electrically isolated power cube, AC line fusing, and dv/dt protection. Its rated DC output is 15 A, while maximum AC input current is approximately 15.5 A. One important distinction: the 805405-3R is also 15 A, but it is a reversing S2R design. That difference matters when matching an existing DC drive system.

Key Technical Specifications

Rockwell Automation’s published Distributed Power System documentation lists 805405-1R as a 15 A, 120/460 VAC, non-reversing field power module with panel mounting.

Reliance 805405-1R 15A

Application and Selection Notes

This unit belongs on the motor field side of a DC drive architecture. It is not the armature power module. The field module works together with the appropriate three-phase armature power hardware and PMI rack arrangement in the Distributed Power System.

That distinction is easy to miss when purchasing old Reliance spares.

Check the following before ordering:

• Confirm the existing field current requirement is within the 15 A rating.
• Verify the incoming AC supply falls within the 120–460 VAC range.
• Confirm the system requires non-reversing S2 operation.
• Check the panel mounting arrangement and wiring against the original installation.
• Verify the controller, PMI rack, and associated armature power module configuration.

Do not substitute the 805405-3R simply because both versions carry a 15 A rating. The 3R is a reversing field-power configuration.

Quality Inspection and Pre-Shipment Checks

For legacy power modules, inspection should focus on electrical condition as much as exterior appearance.

1. Incoming inspection: Verify nameplate, model number, serial number, terminal condition, SCR assembly, fuses, and visible signs of overheating or repair.
2. Functional testing: Where a compatible SF3000/AutoMax test setup is available, verify controlled output behavior and module response.
3. Electrical checks: Check insulation, grounding continuity, terminal integrity, and relevant semiconductor paths before energization.
4. Configuration verification: Record any jumpers, wiring links, or application-specific settings found on the original unit.
5. Final QC: Photograph the identification label, protect the module against moisture and mechanical shock, and package it securely for export shipment.

Test photographs and available test reports should accompany the shipment when requested.

Technical Replacement Risks

Current rating is not enough. A 15 A label does not automatically make another Reliance field module interchangeable.

Bridge type matters. The 805405-1R uses a non-reversing S2 bridge, while the 805405-3R uses a reversing S2R arrangement.

Input voltage matters too. The published compatible range is 120–460 VAC. Confirm the actual line supply before installation.

Watch the cooling and mounting. This is a panel-mounted power module. Inspect cabinet airflow, heat buildup, terminals, and nearby conductors before returning the drive to service.

And one practical point: capture the old wiring before removal. A clear photograph of every terminal can save far more time than trying to reconstruct the circuit from memory.

Purchase and Logistics Notes

For international procurement, state the complete part number 805405-1R and identify the unit as a 15 A non-reversing single-phase field power module on the purchase order. Specify the actual condition separately: New Original, New Surplus, Refurbished, or Repaired.

Because this is legacy Reliance Electric hardware, stock status varies considerably between suppliers. Some distributors currently list the unit as available, while technical records indicate that original production has ended.

For export packaging, use ESD protection for exposed electronics, cushioning around the power assembly, and moisture-resistant secondary packaging where required by the shipping route. The commercial invoice, packing list, and product label should carry consistent part-number information.

Quick Conclusion

• 805405-1R is a 15 A single-phase field power module for DC motor systems.
• It accepts 120–460 VAC and uses a non-reversing S2 SCR bridge.
• It is associated with the SF3000 / AutoMax Distributed Power System.
• It is a field-excitation module, not the main armature power module.
• Exact bridge type, voltage range, current rating, and mounting arrangement should be verified before replacement.

FAQ

What is the Reliance 805405-1R 15A used for?

It provides controlled DC field excitation for compatible DC motor drive systems within the SF3000 / AutoMax Distributed Power System architecture.

What is the rated output current?

The published rating is 15 A DC.

What AC input does it support?

The documented input range is 120–460 VAC.

Is it a reversing field module?

No. The 805405-1R is a non-reversing S2 design. The 805405-3R is the reversing 15 A alternative.

Can it replace every 15 A Reliance field module?

No. The bridge configuration, mounting style, system architecture, and wiring must all match the installed application.

Is the model still in production?

Available technical records identify it as a legacy product, and commercial suppliers report varying stock availability. Confirm current condition and lead time before placing an order.