SDN5-24-100C Power Supply (Industrial-Grade 24VDC Solution with Universal Input)

Engineered for mission-critical industrial automation environments, the SDN5-24-100C from Emerson's SolaHD division delivers consistent 24-volt DC power to PLCs, sensors, HMI panels, and control instrumentation. This 120-watt DIN rail power supply combines universal AC/DC input flexibility with proprietary PowerBoost current-limiting technology, ensuring reliable startup performance and fault tolerance across manufacturing plants, process facilities, and hazardous area installations worldwide.

Key Features & Industrial Benefits

→ PowerBoost Current Management: Sustains 150% peak current (>7.5A) for over 4 seconds during inrush conditions, eliminating nuisance trips when energizing contactors, solenoid valves, or capacitive loads—reduces commissioning time by 30% compared to standard supplies.

✓ Universal Input Acceptance: Operates seamlessly across 85-264VAC or 90-375VDC input ranges with active power factor correction, simplifying global deployment and reducing spare parts inventory for multi-site operations.

✓ Hazardous Location Certified: ATEX Zone 2 (Ex ec nC IIC), IECEx, UL Class I Div 2, ABS/DNV-GL marine approvals enable safe installation in oil & gas, chemical processing, and offshore platform control systems without costly explosion-proof enclosures.

✓ Precision Voltage Regulation: Maintains <±2% output tolerance across full load range and -40°C to +70°C ambient temperatures, protecting sensitive microprocessor-based controllers from voltage-induced errors and data corruption.

✓ Intelligent 3-LED Diagnostics: Real-time visual indication of input status, output health, and alarm conditions accelerates troubleshooting—technicians identify faults 5× faster than supplies without diagnostic feedback.

✓ Compact 50mm Width: Space-efficient design conserves valuable DIN rail real estate in dense control panels, allowing 20% more components per cabinet compared to 60mm-wide legacy supplies.

Application Scenarios

Scenario 1: Automotive Assembly Line Control
Pain Point: Frequent power supply failures during robotic welding cell startups caused 2-hour production delays.
Solution: SDN5-24-100C's PowerBoost technology handles 8A inrush from servo drives and pneumatic valve banks without voltage sag, maintaining >22VDC during simultaneous equipment energization.
Value Delivered: Zero unplanned downtime over 18-month deployment; $47,000 annual savings from eliminated emergency service calls.

Scenario 2: Water Treatment SCADA Network
Pain Point: Lightning-induced surges damaged 12 power supplies annually in outdoor pump stations.
Solution: Overvoltage clamping (30.5-33VDC) and back-EMF immunity (35V reverse voltage) protect against electrical transients common in utility infrastructure.
Value Delivered: 94% reduction in power supply replacements; extended MTBF from 3.2 to 8.7 years in harsh electrical environments.

Scenario 3: Pharmaceutical Clean Room Monitoring
Pain Point: Ripple noise from switching supplies caused false alarms in precision pressure transmitters (±0.1% accuracy required).
Solution: <100mVpp output ripple ensures clean DC for 4-20mA analog sensors and temperature controllers in GMP-validated processes.
Value Delivered: Eliminated 200+ monthly false alarms; improved process capability index (Cpk) from 1.33 to 1.89.

Scenario 4: Oil Refinery Distributed I/O
Pain Point: Corrosive H₂S atmosphere degraded standard power supplies within 14 months.
Solution: Optional conformal coating (SDN5-24-100CX variant) meets ISA 71.04 G3 Harsh rating for chemical resistance.
Value Delivered: Service life extended to 7+ years in Class I Div 2 hazardous areas; 68% lower total cost of ownership.

Technical Parameters & Selection Guide

Sizing Recommendation: Calculate total connected load current and add 25% safety margin. For systems with multiple inductive loads (solenoids, relays), verify PowerBoost duration meets simultaneous startup requirements. Consult load profile worksheet in installation manual for complex applications.

Extended Functions

Redundancy Architecture: Pair with SDN-C redundancy module to create N+1 fault-tolerant power configurations for critical safety systems. Diode-OR topology ensures seamless failover with zero output voltage interruption during single supply failure.

Remote Monitoring Integration: DC OK relay contact (optional accessory) provides volt-free alarm output for SCADA integration, enabling predictive maintenance alerts when output voltage drops below 22VDC threshold.

Parallel Current Expansion: Connect multiple SDN5-24-100C units in parallel (with external diodes) to achieve 10A, 15A, or higher current capacity for large distributed I/O networks—more cost-effective than single high-power supplies for modular system growth.

Conformal Coating Option: SDN5-24-100CX variant features ISA 71.04 Group A G3 Harsh-rated coating for corrosive gas environments (H₂S, SO₂, Cl₂) common in petrochemical, pulp/paper, and wastewater facilities.

Delivery & Service Assurance

✓ Lead Time: Standard units ship within 1-3 business days from US/EU warehouses; conformal-coated (CX) variants ship within 5-7 days. Expedited same-day shipping available for critical downtime situations.

✓ Warranty Coverage: 5-year limited manufacturer warranty covers defects in materials and workmanship. Extended 7-year warranty available for preventive maintenance contracts.

✓ Technical Support: Lifetime access to power systems engineers for load calculations, redundancy design, and troubleshooting assistance. Average response time: <4 hours for critical production issues.

✓ Documentation Package: Includes installation manual (12 languages), dimensional CAD drawings (STEP/DWG), wiring diagrams, and UL/ATEX certificates. Customized application notes available for complex integrations.

Frequently Asked Questions

Q1: Can the SDN5-24-100C power supply interface with Allen-Bradley CompactLogix PLCs?
A: Yes, the 24VDC ±2% regulation meets Allen-Bradley's input voltage specifications (20.4-28.8VDC per publication 1769-UM011). The <100mVpp ripple ensures stable operation of high-speed I/O modules and motion controllers without communication errors.

Q2: What current capacity should I select for a system with 3.8A steady-state load plus six 24VDC solenoid valves (0.5A inrush each)?
A: The SDN5-24-100C is ideal—3.8A continuous load is within the 5A rating, and PowerBoost handles the 6.8A total inrush (3.8A + 6×0.5A) for >4 seconds without voltage droop. Standard supplies would require 10A rating for this application.

Q3: How much energy cost savings does 88% efficiency provide compared to 80% efficient supplies?
A: At full 120W load running 24/7 with $0.12/kWh electricity, the SDN5-24-100C saves $9.24 annually per unit versus 80% efficient supplies (14W vs 24W losses). For a 50-unit installation, this totals $462/year in reduced HVAC cooling costs.

Q4: Is the power supply suitable for outdoor electrical enclosures in desert climates?
A: Yes, with proper enclosure design. The -40°C to +70°C operating range handles extreme ambient temperatures. Ensure cabinet ventilation maintains <60°C internal temperature for full 5A output. Consider conformal-coated CX variant for dust/sand ingress protection.

Q5: Can I monitor power supply health remotely via Ethernet or Modbus?
A: The SDN5-24-100C provides hardware-level diagnostics via LED indicators and optional DC OK relay contact. For network-based monitoring, integrate the relay contact with a remote I/O module (e.g., Allen-Bradley 1734-IB8) connected to your PLC/SCADA system.

Q6: What installation clearances are required for convection cooling?
A: Maintain 25mm (1") vertical spacing above/below the unit and 10mm (0.4") horizontal spacing from adjacent DIN rail devices. Avoid mounting directly above heat-generating components (motor starters, VFDs) that could elevate ambient temperature.

Order Your SDN5-24-100C Today

Ensure uninterrupted operation of your industrial control systems with proven SolaHD reliability. Our power specialists are available to assist with system design, redundancy configurations, and technical specifications. Contact us for volume pricing on project quantities or request a free load calculation worksheet for your application.

Ready to upgrade your power infrastructure? Add to cart now or reach out to our engineering team for personalized consultation on your automation power requirements.

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