Overview
The Mean Well S-40-24 is a 43-watt single-output switching power supply designed for industrial and commercial automation equipment. It delivers 24V at 1.8A output and accepts universal AC input from 85–264VAC at 47–63Hz. This enclosed, panel-mount design is compact and suitable for control systems, LED drivers, instrumentation, and machinery requiring reliable regulated power. The unit is discontinued from new production but remains widely available in the used and surplus market due to its proven performance record.
Key Features
- Regulated 24V DC output at 1.8A (43W)
- Universal AC input: 85–264VAC with 0.5% load regulation and 0.5% line regulation
- Fixed switching frequency at 56 kHz with short circuit, overload, and over-voltage protection
- Free air convection cooling and 100% full-load burn-in tested
- Compact enclosed design; 5P/9.5 mm pitch terminal block connection
- Efficiency: 78%; Mean Time Before Failure: 330.8K hours minimum
Technical Specifications
- Output Voltage / Current: 24V DC at 1.8A
- Power Rating: 43W
- Input Voltage Range: 85–264VAC, 120–370VDC; 47–63Hz
- Input Current (typical): 1.2A @ 100–240VAC
- Switching Frequency: 56 kHz
- Efficiency: 78%
- Load Regulation: 0.5%
- Line Regulation: 0.5%
- Ripple & Noise: 100 mV peak-to-peak
- Output Adjustment Range: ±10% rated output voltage
- Overload Protection: 105%–150% rated output power via hiccup mode with auto-recovery
- Over-Voltage Protection: 115%–135% rated output voltage via hiccup mode with auto-recovery
- Mean Time Before Failure (MTBF): 330.8K hours minimum
- Dimensions (L×W×H): 5.1 × 3.9 × 1.5 inches
- Mounting: Panel mount with terminal block
- Certifications: UL/CUL/TUV/CB
Typical Applications
- Industrial control systems and PLC power
- LED lighting and signage systems
- Test and measurement equipment
- Telecommunications and networking hardware
- Security and surveillance systems
- Automation and machinery control panels
Compatibility & Replacements
Compatible With
- Any system or panel requiring 24VDC regulated power
- Universal AC mains: 85–264VAC single-phase
- DC input capable systems: 120–370VDC
- Standard 9.5 mm pitch terminal block connectors
- Industrial control and automation cabinets
Replaces / Drop-In Replacement For
- Other discontinued Mean Well S-40-24 units
- Legacy 40W enclosed 24V switching supplies with similar form factor and terminal spacing
- Verify footprint and connection type before substituting in existing designs
Works With
- Allen-Bradley, Siemens, Omron, and other industrial control systems requiring 24VDC auxiliary power
- Any equipment with universal AC input (100–240VAC)
- Panel mount installations using standard DIN or wall-mount configurations
- Diagnostic and monitoring equipment for power supply performance
