Product Overview
The 24V 1A 24W/25W Isolation Switching Power Module is a high-performance, compact AC-DC converter designed to power industrial controls, automation equipment, LED lighting systems, and embedded devices directly from a wall outlet. Rated at 24W–25W (24V @ 1A–1.1A), this encapsulated module eliminates the need for bulky external power bricks by converting hazardous AC mains voltage (85V–265V) into a stable, regulated 24V DC output .
This module is an ideal power solution for relays, solenoid valves, 24V LED strips, DC motors, industrial sensors, PLCs, and programmable controllers. Unlike traditional linear transformers that waste energy as heat, this switching mode power supply (SMPS) achieves up to 88% efficiency while maintaining a compact footprint .
The module features a built-in high-frequency transformer that provides 3000V galvanic isolation between the dangerous high-voltage AC input and the low-voltage DC output, ensuring the safety of both your sensitive electronics and the personnel handling the equipment . Its fully encapsulated or enclosed design protects against dust, moisture, and vibration, making it ideal for integration into industrial panels, home appliances, and commercial electronic products.
Key Features
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24W-25W High Power Output: Delivers stable 24V DC at up to 1A–1.1A continuous current – sufficient for powering multiple sensors, controllers, and small motors
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Wide Universal Input Voltage: Accepts 85V ~ 265V AC (47-63Hz) or 100V ~ 370V DC, making it compatible with global mains standards (110V, 220V, 240V) without jumpers
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High Efficiency: Converts AC power with up to 88% efficiency (typical), minimizing energy waste and heat generation
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3000V Galvanic Isolation: High-frequency transformer provides complete electrical isolation between AC input and DC output, enhancing safety and noise immunity
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Multiple Protection Features: Built-in overcurrent, overtemperature, short-circuit, overload, and overvoltage protection ensure reliable operation under fault conditions
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Wide Operating Temperature: Rated for -25°C to +70°C (or -10°C to +85°C with derating), suitable for demanding industrial environments
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Low Ripple & Noise: Clean DC output with minimal ripple ensures stable power for sensitive electronics
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PCB or Chassis Mount Options: Available in encapsulated PCB-mount or DIN-rail/enclosed chassis configurations for various installation requirements
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Safety Certifications: Complies with UL, CE, RoHS standards for industrial and commercial applications
Technical Specifications
Product Variations & Types
This 24V 25W power module is available in several form factors:
The encapsulated version is excellent for space-constrained applications, but care is required to avoid overheating as the potting acts as an insulator . The DIN rail type is the industrial standard.
Pinout & Connection Guide
The encapsulated module uses a standard 4-pin DIP arrangement. Pin labeling may vary slightly between manufacturers—always verify the silkscreen on your specific module.
AC Input Side (Primary / High Voltage)
For the LS25-24 chassis mount model, input connects via screw terminals (Line/Neutral), while the PCB-mount KWS series uses pins .
DC Output Side (Secondary / Low Voltage)
Important: For the encapsulated DIP version, the input and output sections are separated by the isolation barrier on the PCB.
⚠️ Critical Safety Warning
This module deals with potentially lethal high voltage. Always ensure the device is UNPLUGGED during wiring. Use appropriately rated insulated wire (18-22 AWG) for AC connections.
Usage Guide
1. Safety First
⚠️ HIGH VOLTAGE RISK – Always ensure the module is DISCONNECTED FROM MAINS POWER before handling, soldering, or modifying connections. Do not touch any part of the AC side while the module is powered.
2. Mounting
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For PCB-Mount Modules: Solder the module directly to a PCB or use a DIP socket for easy removal.
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For DIN-Rail Modules: Snap onto standard 35mm DIN rail.
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For Chassis-Mount Modules: Secure using M3 screws through mounting holes.
In a typical 4-DIP encapsulated module, Pin 1 is the AC Hot input, Pin 2 is AC Neutral, Pin 3 is DC Ground, and Pin 4 is the +24V DC output .
3. AC Input Connection
Using 18-22 AWG stranded or solid-core wire:
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Connect L (Live) to the AC Live wire (through a 2A-3A slow-blow fuse and switch for safety)
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Connect N (Neutral) to the AC Neutral wire
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If present, connect the ground terminal to Earth Ground
4. DC Output Connection
Connect your 24V load to the output pins:
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+V → Positive terminal of your device (e.g., LED strip, sensor, PLC)
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-V / GND → Negative terminal / Ground return
Tip: For powering sensitive analog circuits, add a 100µF–470µF electrolytic capacitor across the output terminals to reduce switching ripple.
5. Testing
Before connecting expensive equipment:
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Double-check all AC and DC connections for shorts
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Plug module into AC outlet
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Use a multimeter to verify output voltage is 24V ±0.5V
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Measure with a load (e.g., a 24V LED) to ensure stable operation
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Add forced air cooling if operating near maximum load in enclosed spaces
6. Typical Applications
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Industrial Control Panels: Power PLCs, relays, contactors, and indicator lights
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LED Lighting: 24V LED strips, architectural lighting, signage
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Motor Control: Small DC motors, fans, pumps
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Automation: Solenoid valves, actuators, sensors
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Security Systems: Alarms, access control panels, cameras
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Telecom/Networking: Routers, switches, modems
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3D Printers & CNC: Control boards, fans, and extruders
Q: What is the maximum load I can connect to this power supply (1A)?
1A at 24V equals 24W. This is sufficient for:
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Multiple 24V relays (each typically 20-40mA)
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Small DC motors (1A peak)
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24V LED strips up to 24W total
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A full industrial control system (PLC + sensors)
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For higher current requirements, consider a higher-rated supply (e.g., 24V 2A or 24V 5A)
Q: Is this power supply truly isolated? Is it safe to touch the output wires?
Yes and Yes. This module provides 1500V–3000V galvanic isolation between the input AC mains and the output DC voltage . There is no direct electrical path, so touching the 24V output wires is safe (though you should never touch the AC input side).
Q: What happens if I exceed the current rating (overload)?
The module features built-in overcurrent protection (OCP) and overload protection (OLP). If the load exceeds the rated current, the output voltage will drop or the module will shut down to protect itself. It typically recovers automatically once the overload is removed .
Q: Will this module run hot under continuous load?
At 1A continuous (24W), the module will generate some heat. With 85-88% efficiency, about 3-4W is dissipated as heat. Ensure adequate airflow and that the ambient temperature stays within specifications (typically -10°C to +70°C) . For enclosed spaces, consider adding ventilation or derating the load.
Q: Can I use this module for a home automation project with a 24V LED strip?
Yes. This is a perfect application. Ensure your LED strip’s total power consumption does not exceed 24W. For a 24V strip, a 5-meter roll typically consumes about 60W – in which case, you would need a higher current supply (e.g., 2.5A or 5A).
Q: What is the difference between the encapsulated module and the chassis-mount one?
The encapsulated module is designed for PCB mounting and offers better environmental protection (dust, moisture) but less airflow for cooling. The chassis-mount version (e.g., LS25-24) is larger, has screw terminals for easy wiring, and dissipates heat better, making it suitable for industrial control cabinets .
Q: What is the no-load power consumption?
Most high-quality 24V switching power supplies have a standby power consumption of less than 0.3W to 0.5W when no load is connected, making them highly efficient even when idle.
Q: Can I use this module to charge a 24V lead-acid or lithium battery?
No, not directly. This is a Constant Voltage (CV) power supply. A battery requires a Constant Current/Constant Voltage (CC/CV) charging profile. Using this directly could over-current and damage the battery. Always use a dedicated battery charger.
Q: What is the MTBF (Mean Time Between Failures) of these modules?
High-quality industrial modules from brands like TDK-Lambda or Mean Well have MTBF ratings exceeding 500,000 hours (approx. 57 years) under normal operating conditions .
Q: Does this module work with 110V (US standard) and 220V (EU standard)?
Yes. The wide input range (85-265V AC) makes it compatible with all global voltage standards, including 100V, 110V, 120V, 220V, 230V, and 240V systems . No jumper or switch is required—the module autodetects the input voltage.
Q: How can I tell the input/output polarity on the PCB-type module?
The silk screen on the PCB usually has a dot or mark indicating Pin 1. Pin 1 is typically AC Live (Hot), Pin 2 is AC Neutral; on the output side, Pin 3 is DC Ground, Pin 4 is +24V. Always check the datasheet or the silkscreen on your specific module before wiring.
