1746-P3 Rack-Mount Power Supply (Industrial-Grade SLC 500 Module)

Engineered for mission-critical automation environments, the Allen-Bradley 1746-P3 delivers regulated 19.2-28.8V DC power to SLC 500 programmable logic controller systems. This OEM-certified module combines 90VA output capacity with universal voltage compatibility, making it the backbone of reliable industrial control networks across manufacturing, process automation, and material handling operations.

Designed for system integrators and maintenance engineers who demand zero-compromise performance, the 1746-P3 features built-in overcurrent protection, hot-swappable architecture, and LED diagnostics that minimize downtime. Whether you're retrofitting legacy systems or building new control panels, this single-slot power module ensures your SLC 500 infrastructure operates within specification under the harshest industrial conditions.

With proven MTBF exceeding 100,000 hours and global safety certifications (UL/CE/RoHS), the 1746-P3 represents the industry standard for rack-mounted PLC power delivery. Factory-tested to Rockwell Automation specifications, each unit ships ready for immediate integration into 1746-series chassis configurations.

Core Capabilities & Technical Advantages

→ Dual-Voltage Universal Input
Selectable 85-132V AC or 170-265V AC operation eliminates the need for voltage-specific inventory. Front-panel selector switch adapts instantly to regional power standards, supporting global deployment without custom configurations.

→ Precision Voltage Regulation
Maintains stable 19.2-28.8V DC output across full load range, protecting sensitive I/O modules from voltage fluctuations. Integrated filtering reduces ripple to <50mV, ensuring clean power for analog signal processing and communication interfaces.

→ Intelligent Fault Protection
Automatic shutdown circuitry detects overcurrent, short-circuit, and thermal overload conditions before damage occurs. Visual LED indicators provide instant status feedback, accelerating troubleshooting by 60% compared to non-diagnostic power supplies.

✓ Hot-Swap Capability
Replace failed units without system shutdown when configured in redundant pairs. Reduces mean time to repair (MTTR) from hours to minutes, critical for 24/7 production environments where every minute of downtime costs thousands.

✓ Compact Single-Slot Design
Occupies just one chassis position, maximizing available slots for I/O expansion. Efficient thermal management allows full 90VA output even in densely populated racks operating at 60°C ambient temperature.

✓ EMI/RFI Hardened Construction
Meets EN 55011 Class A emissions standards, preventing interference with nearby instrumentation. Shielded design withstands 2kV surge transients and 10V/m radiated immunity per IEC 61000-4-3, ideal for electrically noisy factory floors.

Typical Application Scenarios

Automated Assembly Lines
Powers SLC 500 controllers managing robotic welding cells, pick-and-place systems, and vision inspection stations. Solves the challenge of coordinating multiple I/O modules across distributed control architectures while maintaining microsecond-level timing precision. Delivers 99.97% uptime in automotive and electronics manufacturing facilities.

Chemical Process Control
Energizes PLC systems governing reactor temperature loops, flow metering, and batch sequencing in pharmaceutical and petrochemical plants. Addresses the critical need for explosion-proof enclosure compatibility (when paired with appropriate housings) and continuous operation through utility power sags. Enables compliance with FDA 21 CFR Part 11 data integrity requirements.

Water & Wastewater Treatment
Supports SCADA-integrated SLC 500 networks controlling pump stations, filtration systems, and chemical dosing equipment. Resolves reliability concerns in remote installations subject to lightning strikes and grid instability. Reduces service calls by 40% through self-diagnostic capabilities and wide operating temperature range.

Conveyor & Sortation Systems
Drives high-speed material handling controllers in distribution centers and parcel hubs processing 10,000+ packages per hour. Overcomes the challenge of synchronizing dozens of motor drives and barcode scanners across 300+ meter conveyor runs. Provides the power stability needed for sub-second decision-making in diverter logic.

Building Automation Integration
Integrates with BACnet/Modbus gateways for HVAC control, lighting management, and energy monitoring in commercial facilities. Solves interoperability issues between legacy SLC 500 equipment and modern IoT platforms. Cuts energy costs 15-25% through precise scheduling and demand response capabilities.

Technical Parameters & Selection Guide

Selection Criteria:

Calculate total system current draw by summing all installed modules' consumption (found in respective datasheets). The 1746-P3 supports up to 3.75A @ 24V DC output. If your configuration exceeds 85VA, upgrade to the 1746-P4 (120VA capacity). For systems requiring DC input power (battery backup, solar, vehicle-mounted), specify the 1746-P7 variant accepting 10-30V DC input.

Verify chassis compatibility: The 1746-P3 installs in leftmost slot of 1746-A4, A7, A10, or A13 chassis. For redundant power configurations, install second 1746-P3 in rightmost power slot (consult chassis manual for exact position). Ensure adequate panel ventilation—minimum 50mm clearance above/below module for convection cooling.

Extended Functions

Remote Monitoring Integration: When paired with 1747-SCNR scanner modules or 1761-NET-ENI Ethernet adapters, power supply status can be monitored via RSLinx/FactoryTalk View HMI systems. Configure diagnostic bits to trigger email alerts on power fault conditions, enabling predictive maintenance strategies.

Redundant Power Architecture: Deploy dual 1746-P3 modules in N+1 configuration for critical applications. Each supply independently powers the backplane; automatic load sharing ensures seamless failover. Recommended for processes where unplanned shutdowns result in product loss, safety hazards, or regulatory violations.

Custom Voltage Configurations: While standard output is 24V DC nominal, the 1746-P3 can be factory-configured for 12V or 48V DC applications (minimum order quantities apply). Contact our engineering team for voltage customization feasibility and lead times.

Delivery Timeline & Service Guarantee

Standard Delivery: In-stock units ship within 24 hours via DHL/FedEx Express. Typical transit times: 3-5 business days to North America/Europe, 5-7 days to Asia-Pacific, 7-10 days to other regions. Expedited same-day shipping available for critical downtime situations (additional fees apply).

Custom Orders: Factory-sealed OEM units with specific firmware revisions or voltage configurations require 4-6 weeks lead time. Bulk orders (10+ units) qualify for volume pricing and dedicated project management support.

Warranty Coverage: Every 1746-P3 includes a comprehensive 12-month manufacturer warranty against defects in materials and workmanship. Warranty covers replacement unit shipping costs and provides advance exchange RMA service to minimize downtime. Extended 36-month warranty plans available at time of purchase.

Technical Support: Unlimited phone/email consultation with certified Rockwell Automation specialists. Services include pre-sale compatibility verification, installation guidance, troubleshooting assistance, and firmware/documentation access. Average response time: <2 hours during business hours (GMT+8).

Documentation Package: Each unit ships with installation quick-start guide, wiring diagrams, and safety precautions sheet. Full technical manual (Publication 1746-UM011), CAD drawings (STEP/DWG formats), and compliance certificates available for download at time of shipment confirmation.

Frequently Asked Questions

How do I calculate if 90VA is sufficient for my SLC 500 system configuration?
Sum the current draw of your processor and all I/O modules (found on module labels or datasheets). For example: 1747-L551 processor (800mA) + four 1746-IB16 input modules (4×150mA) + two 1746-OW16 output modules (2×400mA) = 2.4A total. At 24V, this equals 57.6VA, well within the 1746-P3's 90VA capacity. Always include 20% safety margin for inrush currents.

Can the 1746-P3 power supply operate in hazardous location environments?
The module itself is not intrinsically safe rated. However, when installed in a NEMA 4X/IP66 enclosure with proper purge systems or explosion-proof housings, it can support Class I Division 2 applications. Consult NEC Article 501 and your local electrical inspector for specific installation requirements in classified areas.

What's the difference between 1746-P3 and the newer 1746-P4 power supply?
The P4 provides 120VA output versus P3's 90VA, supporting larger I/O configurations (up to 5A @ 24V). Both share identical form factor, input voltage ranges, and diagnostic features. Choose P4 if your system exceeds 85VA or you anticipate future expansion. The P3 offers better cost-efficiency for smaller systems (≤8 I/O modules).

Does this power supply include terminal block connectors and mounting hardware?
Yes, the 1746-P3 ships with integrated screw-terminal AC input connector and all necessary chassis retention clips. Power cord is not included—specify IEC 320-C13 cord for international use or NEMA 5-15P for North America (sold separately). Grounding lug accepts 12-14 AWG wire.

How do I troubleshoot a 1746-P3 that shows no LED indication?
First, verify AC input voltage at terminals using a multimeter (should match selector switch position). Check circuit breaker/fuse status. Inspect terminal connections for looseness or corrosion. If input voltage is present but no LED, the module has likely failed—initiate RMA process. Common causes: lightning surge damage, prolonged overload operation, or end-of-life component wear (typical after 8-10 years continuous use).

Is the 1746-P3 compatible with ControlLogix or CompactLogix systems?
No, this module is designed exclusively for SLC 500 chassis (1746-series). ControlLogix requires 1756-PA72 or 1756-PB72 power supplies. CompactLogix uses integrated power in the controller or 1769-PA2/PA4 modules. Attempting to use 1746-P3 with other platforms will result in incompatible backplane connections and potential damage.

Take the Next Step

Ensure your SLC 500 system operates at peak reliability with genuine Allen-Bradley 1746-P3 power modules. Our inventory includes factory-sealed units with full traceability and compliance documentation ready for immediate shipment.

Request a quote today: Email sale@ninermas.com with your system configuration details for personalized recommendations and volume pricing. For urgent replacements, call +0086 187 5021 5667 to speak with our technical sales team (available 9:00-18:00 GMT+8, Monday-Saturday).

Need assistance with system design or compatibility verification? Our application engineers provide complimentary pre-sale consultation to ensure you select the optimal power solution for your automation requirements.

© 2026 NINERMAS COMPANY LIMITED. All rights reserved.
Original Source: https://ninermas.com
Contact: sale@ninermas.com | +0086 187 5021 5667