SDN 20-24-100 Industrial-Grade Power Supply (SolaHD Series)

The SDN 20-24-100 represents a proven solution for delivering regulated 24-volt DC power in industrial control environments. Manufactured under the SolaHD brand by Emerson, this 100-watt switching power supply combines space-efficient DIN rail mounting with the rugged construction required for continuous operation in manufacturing, process control, and infrastructure applications.

Designed for system integrators and maintenance teams managing PLC-based control architectures, the SDN 20-24-100 addresses the fundamental challenge of providing clean, stable DC voltage to field devices, I/O modules, and instrumentation. Its universal input capability and comprehensive protection features reduce installation complexity while safeguarding downstream equipment from power anomalies.

With global safety certifications and a track record spanning thousands of installations, this power supply delivers the reliability that industrial operations demand—minimizing unplanned downtime and simplifying panel design across diverse automation platforms.

Core Features & Business Value

✓ Universal Input Voltage (100-240 VAC)
Eliminates the need for voltage-specific inventory, streamlining procurement and reducing spare parts complexity across multi-site operations.

✓ Compact DIN Rail Form Factor
Maximizes usable space in control cabinets, allowing for higher device density and more efficient panel layouts in retrofit and new installations.

✓ Multi-Layer Protection Circuitry
Integrated overload, short-circuit, and overvoltage safeguards protect critical automation assets, reducing equipment damage costs and emergency service calls.

✓ High Efficiency Switching Design (89% typical)
Lowers heat generation and energy consumption, contributing to reduced cooling requirements and operational expenses in large-scale deployments.

✓ Extended Temperature Range (-25°C to +70°C)
Enables reliable operation in non-climate-controlled environments, from outdoor enclosures to high-ambient manufacturing floors.

✓ Visual Diagnostic Indicators
Front-panel LEDs accelerate troubleshooting during commissioning and maintenance, cutting mean time to repair and minimizing production interruptions.

Industrial Application Scenarios

→ Discrete Manufacturing & Assembly Lines
Powers proximity sensors, photoelectric switches, and pneumatic valve manifolds in automotive, electronics, and consumer goods production. Addresses the pain point of voltage fluctuations causing false sensor readings and production stoppages. Delivers consistent uptime through robust input filtering and stable output regulation.

→ Process Industries (Chemical, Pharmaceutical, Food & Beverage)
Energizes distributed I/O systems, flow transmitters, and level sensors in batch control and continuous process applications. Solves the challenge of maintaining instrument accuracy in electrically noisy environments with high electromagnetic interference. Provides clean power that preserves measurement integrity and process quality.

→ Water & Wastewater Treatment Facilities
Supports SCADA remote terminal units, pump controllers, and chemical dosing systems in municipal and industrial treatment plants. Overcomes the difficulty of powering equipment in outdoor, high-humidity locations subject to temperature extremes. Ensures reliable operation through conformal coating and wide operating range.

→ Building Automation & HVAC Control
Drives BACnet controllers, damper actuators, and variable air volume (VAV) terminal units in commercial and institutional facilities. Resolves the issue of coordinating multiple power sources across distributed control networks. Simplifies system architecture with standardized 24VDC distribution.

→ Material Handling & Conveyor Systems
Feeds barcode scanners, inductive sensors, and sortation diverters in distribution centers and logistics operations. Addresses the problem of power supply failures causing package misrouting and throughput losses. Maximizes system availability through high MTBF design and proven component selection.

Technical Parameters & Selection Guide

Selection Criteria: Calculate total connected load including all field devices, I/O modules, and instrumentation. Add 20-30% safety margin for inrush current and future expansion. For loads exceeding 80 watts continuous, consider the SDN 20-24-100. For redundant power requirements, deploy two units with diode-OR modules. Verify ambient temperature does not exceed derating curve specifications.

Extended Capabilities

Parallel Operation: Multiple SDN units can be configured for current sharing or N+1 redundancy using external decoupling diodes, providing fault-tolerant power architectures for critical control systems.

Remote Monitoring Integration: DC OK relay contact enables integration with building management systems, SCADA platforms, or industrial IoT gateways for predictive maintenance and alarm notification.

Customization Options: Factory modifications available for specialized input voltages, extended temperature ratings, or conformal coating upgrades for harsh chemical or marine environments (consult factory for MOQ and lead times).

Delivery & Service Assurance

Standard Lead Time: 3-5 business days for stock items; 2-3 weeks for factory-direct orders
Custom Configurations: 4-6 weeks depending on specification requirements
Warranty Coverage: 3-year manufacturer's warranty covering defects in materials and workmanship
Technical Support: Application engineering assistance available via phone and email during business hours
Documentation Package: Includes installation manual, wiring diagrams, dimensional drawings, and compliance certificates

Frequently Asked Questions

Q: What connection methods does the SDN 20-24-100 support for field wiring?
A: The unit features screw-clamp terminals accepting 12-22 AWG wire (solid or stranded). Terminals are clearly labeled for AC input (L, N, PE) and DC output (+, -, FG). Torque specifications are provided in the installation manual to ensure reliable connections.

Q: Can this power supply handle the inrush current from multiple solenoid valves switching simultaneously?
A: Yes, the SDN 20-24-100 incorporates current-limiting circuitry that manages transient overloads up to 150% of rated output for several seconds. For applications with high inrush demands, ensure total steady-state load remains within the 100W continuous rating.

Q: How much energy cost reduction can I expect compared to linear power supplies?
A: Switching power supplies like the SDN series typically achieve 85-90% efficiency versus 50-60% for linear designs. In a 24/7 operation, this translates to approximately 40% lower energy consumption and reduced heat dissipation, potentially lowering cooling costs in enclosed panels.

Q: What physical clearances are required for proper installation and heat dissipation?
A: Maintain minimum 25mm spacing above and below the unit for convection cooling. Ensure adequate ventilation in the enclosure—forced air cooling may be necessary if ambient temperature exceeds 50°C or if multiple units are mounted in close proximity.

Q: Does this model support remote power monitoring or diagnostics?
A: The SDN 20-24-100 includes a DC OK relay contact that signals output status. This dry contact can be wired to PLC inputs, alarm panels, or SCADA systems for remote monitoring. For advanced diagnostics, consider Emerson's managed power supply series with Modbus or Ethernet connectivity.

Q: Is the output voltage adjustable for applications requiring non-standard DC levels?
A: Yes, a front-accessible potentiometer allows output adjustment from 24 to 28 VDC. This feature accommodates voltage drop compensation in long cable runs or applications requiring slightly elevated charging voltages for battery backup systems.

Take the Next Step

Ready to specify the SDN 20-24-100 for your next project? Contact our application engineering team for technical consultation, volume pricing, or custom configuration options. We provide detailed load calculations, panel layout assistance, and integration support to ensure optimal system performance.

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