Product Overview
The 12V 2A 24W Isolation Switching Power Supply Module is a high-performance, compact AC-DC converter designed to power industrial controls, embedded systems, automation equipment, and IoT devices directly from a wall outlet. Rated at 24 Watts (12V @ 2A), this encapsulated module eliminates the need for bulky external power bricks by converting hazardous AC mains voltage (85V–265V) into a stable, regulated 12V DC output .
This module is an ideal power solution for relays, solenoid valves, LED lighting strips, DC motors, wireless communication modules, PLCs, Arduino, ESP32, industrial sensors, and small appliances. Unlike traditional linear transformers that waste energy as heat, this switching mode power supply (SMPS) achieves up to 83% efficiency while maintaining a compact footprint .
The module features a built-in high-frequency transformer that provides 3000V–4000V 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 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 High Power Output: Delivers stable 12V DC at up to 2A continuous current – sufficient for powering motors, multiple sensors, and industrial controllers
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Wide Universal Input Voltage: Accepts AC 85V ~ 264V (47-63Hz) or DC 120V ~ 370V, making it compatible with global mains standards (110V, 220V, 240V) without jumpers
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High Efficiency: Converts AC power with up to 83% efficiency (typical), minimizing energy waste and heat generation
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4000V Galvanic Isolation: High-frequency transformer provides complete electrical isolation between AC input and DC output, enhancing safety and noise immunity
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Encapsulated Design: Fully potted module protects against dust, moisture, vibration, and physical stress – ideal for industrial environments
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Multiple Protection Features: Built-in overcurrent, overtemperature, short-circuit, and overload protection; some models include OVP (overvoltage protection)
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Low Ripple & Noise: Maximum ripple of 120mV ensures clean DC power for sensitive electronics
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Wide Operating Temperature: Rated for -40°C to +80°C (derating may apply), suitable for demanding industrial environments
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Compact PCB Mount Design: Standard 4-pin through-hole package for easy soldering and robust mechanical attachment
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Safety Certifications: Complies with UL, CE, RoHS standards for industrial and commercial applications
Technical Specifications
Pinout & Connection Guide
The 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)
DC Output Side (Secondary / Low Voltage)
Note: Some modules may have a case ground pin (FG) for connecting to Earth ground—refer to specific datasheet.
⚠️ 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. It is strongly recommended to add a fuse (e.g., 2A-3A slow-blow) and a physical on/off switch in series with the Live/L input for safety.
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 Prototyping: Solder the module directly to a PCB or use a DIP socket for easy removal.
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For Permanent Installation: Solder the module to your custom PCB. The encapsulation protects against vibration and environmental contaminants.
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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Connect FG (Frame Ground) if present – to Earth Ground
4. DC Output Connection
Connect your 12V load to the output pins:
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+V → Positive terminal of your device (e.g., DC motor, LED strip, sensor)
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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 12V ±0.5V
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Measure with a load (e.g., a 12V LED strip) to ensure stable operation
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Add a small heatsink if operating near maximum load in enclosed spaces
6. Typical Applications
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Industrial Control Panels: Power PLCs, relays (multiple), contactors, and indicator lights
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Motor Control: Small DC motors, fans, pumps
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LED Lighting: 12V LED strips, architectural lighting, signage (up to 24W total)
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Automation: Solenoid valves, actuators, sensors
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Security Systems: Alarms, access control panels, cameras
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3D Printers & CNC: Power control boards, fans, and extruders
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Telecom/Networking: Routers, switches, modems
Q: What is the maximum load I can connect to this power supply (2A)?
The module delivers up to 2A continuous at 12V (24W total). This is sufficient for:
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Multiple relays (each typically 20-80mA)
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Small DC motors (2A peak)
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LED strips up to 24W
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An Arduino/ESP32 with multiple sensors
Q: Is this power supply truly isolated? Is it safe to touch the output wires?
Yes and Yes. This module provides 3000V-4000V galvanic isolation between the input AC mains and the output DC voltage . There is no direct electrical path, so touching the 12V output wires is safe (though you should never touch the AC input side).
Q: Can I use this module to charge a 12V 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 (e.g., a TP4056 for Li-ion or a lead-acid charger) between this power supply and your battery.
Q: Can I use this module to power devices connected in series?
No, all devices should be connected in parallel (positive to +12V, negative to GND). Connecting devices in series may lead to voltage imbalances and damage.
Q: What is the voltage tolerance of the output?
The specification allows approximately ±2% to ±5% variation (11.4V – 12.6V) . This is normal for switch-mode power supplies and is well within the operating limits of all 12V electronics.
Q: Why is my multimeter reading slightly less than 12.00V?
The slight variation (typically 11.8V–12.2V) is normal and accounts for manufacturing tolerances. The voltage often returns to exactly 12V under a nominal load.
Q: What happens if I exceed the 2A current limit?
The module has built-in overcurrent protection and will limit the output current or shut down to protect itself. Prolonged overloads may trigger thermal shutdown. Reduce your load and allow the module to cool.
Q: Does this module require external components to work?
No, it is a standalone power supply. Simply connect the AC input and DC output. However, adding a fuse and switch on the AC line is strongly recommended for safety.
Q: Can I use a 12V DC input to power this "AC-DC" module?
No. This module is designed specifically for AC mains voltage (85-264V AC). The internal transformer expects high voltage AC input. Applying 12V DC will not be sufficient.
Q: The module gets warm during use. Is this normal?
Yes. At 2A load, some heat is normal due to inefficiency (~4W of heat at 83% efficiency). However, if it is too hot to touch (>70°C), ensure adequate airflow and that you are not exceeding the 2A limit.
