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Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply
The Mornsun LI100-20B12PR2 is a compact 100W AC/DC power supply designed for industrial DIN-rail mounting applications, delivering regulated 12V DC output with exceptional efficiency and reliability. Industrial automation engineers, control system integrators, and PLC manufacturers rely on this unit to power critical control circuits, sensor networks, and distributed I/O modules in harsh manufacturing environments. This power supply solves the critical challenge of providing stable, isolated DC power in confined panel spaces while maintaining protection against input voltage fluctuations, short circuits, and thermal stress.
Product Overview
The LI100-20B12PR2 operates on the principle of switched-mode power supply (SMPS) technology, converting wide-range AC input (85-264V) into stable 12V DC output through high-frequency switching at approximately 100kHz. This topology enables exceptional power density, allowing 100W of continuous output in a compact single-width DIN-rail module measuring just 90x110x150mm. The internal switching architecture incorporates primary-side regulation and optocoupler feedback isolation, ensuring the output voltage remains within ±5% tolerance even under dynamic load conditions and input voltage variations typical in industrial facilities.
What distinguishes the LI100-20B12PR2 from standard industrial supplies is its combination of universal input voltage range, integrated protection circuits, and extended operating temperature capability from -30 to +70 degrees Celsius. The unit features built-in overvoltage protection (OVP), overcurrent protection (OCP), and short-circuit protection that automatically limits output current to safe levels without requiring external fusing. The isolated output design provides 3000V DC isolation between input and output, critical for safety in multi-voltage panel designs and preventing ground loop noise in sensitive measurement circuits.
Key Specifications
| Specification | Details |
| Product Type | AC/DC DIN-Rail Enclosed Power Supply |
| Brand | Mornsun |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Input Voltage Range | 85-264V AC, 47-63Hz |
| Output Voltage | 12V DC, ±5% regulation |
| Output Current | 8.3A continuous at full load |
| Power Rating | 100W nominal output |
| Efficiency | Greater than 85% at full load |
| Isolation | 3000V DC input to output isolation |
| Protection Features | OVP, OCP, SCP, thermal shutdown |
| Operating Temperature | -30 to +70 degrees Celsius |
| Storage Temperature | -40 to +85 degrees Celsius |
| Mounting | 35mm DIN-rail, single-width |
| Dimensions | 90 x 110 x 150mm (W x H x D) |
| Weight | Approximately 600 grams |
| EMC Compliance | CE certified, EN 55011 Class A |
| Safety Standards | UL, FCC, RoHS compliant |
Key Features
- Wide Input Voltage Range: Accepts 85-264V AC universal input with automatic voltage selection, eliminating the need for separate 110V and 220V models across different facility locations
- High Power Density: Delivers 100W continuous output in a compact single-width DIN-rail form factor, saving valuable panel space in crowded industrial control cabinets
- Integrated Protection Circuits: Built-in overvoltage protection, overcurrent limiting, and short-circuit protection automatically safeguard connected equipment without external fusing requirements
- 3000V Isolation: High-voltage isolation between input and output prevents ground loop noise and meets safety requirements for multi-voltage industrial systems
- Extended Temperature Operation: Rated for -30 to +70 degrees Celsius operating range, suitable for uncontrolled environments including outdoor enclosures and manufacturing floor installations
- Efficient Thermal Design: Greater than 85% efficiency minimizes heat generation and cooling requirements, reducing overall cabinet cooling load
- Fast Transient Response: Optimized feedback control responds rapidly to load changes, maintaining voltage stability during sudden current demands from stepper motors or solenoid coils
- Soft-Start Circuit: Gradual power-up reduces inrush current stress on input AC circuits and transformers, extending equipment lifespan
Applications and Use Cases
- Industrial PLC and Controller Power: Provides stable 12V DC for programmable logic controllers, motion controllers, and distributed I/O modules in manufacturing automation systems requiring high reliability
- Building Automation Systems: Powers access control systems, lighting controllers, and HVAC management units in commercial buildings where DIN-rail mounting in control panels is standard practice
- Telecommunications Equipment: Supplies regulated power to telecom switching equipment, VoIP gateways, and network interface modules requiring isolated DC power with wide input tolerance
- Industrial Sensor Networks: Delivers power to pressure transducers, temperature sensors, and proximity switches in harsh factory environments with voltage fluctuations and electrical noise
- UPS and Battery Charging Systems: Serves as primary power source for uninterruptible power supply systems and battery charging circuits in critical infrastructure applications
- LED Lighting Control: Powers LED driver circuits and dimming controllers in industrial lighting systems requiring stable 12V DC with protection against short circuits
- Machine Tool Control Cabinets: Supplies power to spindle drives, coolant pumps, and safety relay modules in CNC machines and automated manufacturing equipment
How to Use
Installation of the Mornsun LI100-20B12PR2 requires mounting the unit vertically on a standard 35mm DIN-rail within an enclosed control panel. Position the supply away from direct heat sources and ensure minimum 50mm clearance above and below the unit for adequate convection cooling. Connect the AC input terminals (L and N) to your facility's main power distribution, ensuring proper grounding through the protective earth (PE) terminal. Use appropriately rated cable gauge: minimum 1.5mm squared copper for input connections at 100W load, and minimum 2.5mm squared for output connections to handle the full 8.3A output current without excessive voltage drop.
Before applying power, verify all connections are secure and insulated. The output terminals deliver 12V DC with the positive terminal marked red and negative terminal marked black. Connect your load circuits in parallel to the output terminals, ensuring total current does not exceed 8.3A continuous rating. The unit will automatically activate its thermal shutdown protection if internal temperature exceeds safe limits, typically when ambient temperature exceeds 70 degrees Celsius or ventilation is severely restricted. Allow the supply to cool before restarting. For applications requiring redundancy or higher current capacity, multiple units can be connected in parallel by connecting positive terminals together and negative terminals together, though this requires load sharing current limiting circuits for optimal performance.
Frequently Asked Questions
What is the difference between the LI100-20B12PR2 and other Mornsun 100W supplies?
The LI100-20B12PR2 specifically delivers 12V DC output at 8.3A, making it ideal for standard industrial control applications. Other variants in the LI100 series offer different output voltages (5V, 24V, 48V) and current ratings. The PR2 designation indicates this is a second-generation design with improved EMC performance and faster transient response compared to earlier versions. Always verify the output voltage specification matches your application requirements before ordering.
Can I use this power supply with 110V or 220V input without any modifications?
Yes, the LI100-20B12PR2 automatically accepts both 110V and 220V AC input within its specified 85-264V range without any manual switching or modifications. The internal circuitry automatically adjusts to the input voltage presented. This universal input capability eliminates the need to stock separate power supplies for different facility locations or international installations.
What protection does this supply provide against short circuits?
The LI100-20B12PR2 includes built-in short-circuit protection (SCP) that automatically limits output current to approximately 110% of rated current when a short circuit is detected. This current-limiting behavior prevents catastrophic failure of the power supply and connected equipment. The protection is automatic and non-latching, meaning the supply will recover normal operation once the short circuit is removed. However, for critical applications, external fusing is still recommended as an additional safety layer.
What is the isolation voltage rating and why is it important?
The LI100-20B12PR2 provides 3000V DC isolation between the AC input side and 12V DC output side. This isolation prevents dangerous ground loops when the power supply is used in systems with multiple voltage levels or when connected to equipment with different grounding schemes. The isolation also provides electrical safety protection and reduces conducted noise coupling from the high-frequency switching circuits into sensitive measurement circuits. This isolation is maintained continuously during normal operation.
How much heat does this supply generate and what cooling is required?
At full 100W output load with greater than 85% efficiency, the LI100-20B12PR2 generates approximately 15-18W of heat. This is dissipated through the metal enclosure via natural convection. Ensure minimum 50mm clearance above and below the unit for adequate air circulation. In confined spaces or high-ambient-temperature environments above 50 degrees Celsius, consider installing a small cabinet cooling fan to maintain internal temperatures below the 70-degree Celsius thermal shutdown threshold. Proper ventilation extends the supply's operational lifespan significantly.
Can I parallel multiple LI100-20B12PR2 units for higher current output?
Multiple units can be connected in parallel by connecting all positive terminals together and all negative terminals together to achieve combined current capacity. However, without active load-sharing circuits, the unit with lower output voltage will supply more current than the others, potentially causing unequal stress. For reliable parallel operation, implement current-sharing modules or use external current-limiting resistors (typically 0.1 ohm, 5W per unit) in series with each output. This ensures balanced current distribution and prevents any single unit from being overloaded.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return
Buy Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply Online in India
Purchase the Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.
Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply
The Mornsun LI100-20B12PR2 is a compact 100W AC/DC power supply designed for industrial DIN-rail mounting applications, delivering regulated 12V DC output with exceptional efficiency and reliability. Industrial automation engineers, control system integrators, and PLC manufacturers rely on this unit to power critical control circuits, sensor networks, and distributed I/O modules in harsh manufacturing environments. This power supply solves the critical challenge of providing stable, isolated DC power in confined panel spaces while maintaining protection against input voltage fluctuations, short circuits, and thermal stress.
Product Overview
The LI100-20B12PR2 operates on the principle of switched-mode power supply (SMPS) technology, converting wide-range AC input (85-264V) into stable 12V DC output through high-frequency switching at approximately 100kHz. This topology enables exceptional power density, allowing 100W of continuous output in a compact single-width DIN-rail module measuring just 90x110x150mm. The internal switching architecture incorporates primary-side regulation and optocoupler feedback isolation, ensuring the output voltage remains within ±5% tolerance even under dynamic load conditions and input voltage variations typical in industrial facilities.
What distinguishes the LI100-20B12PR2 from standard industrial supplies is its combination of universal input voltage range, integrated protection circuits, and extended operating temperature capability from -30 to +70 degrees Celsius. The unit features built-in overvoltage protection (OVP), overcurrent protection (OCP), and short-circuit protection that automatically limits output current to safe levels without requiring external fusing. The isolated output design provides 3000V DC isolation between input and output, critical for safety in multi-voltage panel designs and preventing ground loop noise in sensitive measurement circuits.
Key Specifications
| Specification | Details |
| Product Type | AC/DC DIN-Rail Enclosed Power Supply |
| Brand | Mornsun |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Input Voltage Range | 85-264V AC, 47-63Hz |
| Output Voltage | 12V DC, ±5% regulation |
| Output Current | 8.3A continuous at full load |
| Power Rating | 100W nominal output |
| Efficiency | Greater than 85% at full load |
| Isolation | 3000V DC input to output isolation |
| Protection Features | OVP, OCP, SCP, thermal shutdown |
| Operating Temperature | -30 to +70 degrees Celsius |
| Storage Temperature | -40 to +85 degrees Celsius |
| Mounting | 35mm DIN-rail, single-width |
| Dimensions | 90 x 110 x 150mm (W x H x D) |
| Weight | Approximately 600 grams |
| EMC Compliance | CE certified, EN 55011 Class A |
| Safety Standards | UL, FCC, RoHS compliant |
Key Features
- Wide Input Voltage Range: Accepts 85-264V AC universal input with automatic voltage selection, eliminating the need for separate 110V and 220V models across different facility locations
- High Power Density: Delivers 100W continuous output in a compact single-width DIN-rail form factor, saving valuable panel space in crowded industrial control cabinets
- Integrated Protection Circuits: Built-in overvoltage protection, overcurrent limiting, and short-circuit protection automatically safeguard connected equipment without external fusing requirements
- 3000V Isolation: High-voltage isolation between input and output prevents ground loop noise and meets safety requirements for multi-voltage industrial systems
- Extended Temperature Operation: Rated for -30 to +70 degrees Celsius operating range, suitable for uncontrolled environments including outdoor enclosures and manufacturing floor installations
- Efficient Thermal Design: Greater than 85% efficiency minimizes heat generation and cooling requirements, reducing overall cabinet cooling load
- Fast Transient Response: Optimized feedback control responds rapidly to load changes, maintaining voltage stability during sudden current demands from stepper motors or solenoid coils
- Soft-Start Circuit: Gradual power-up reduces inrush current stress on input AC circuits and transformers, extending equipment lifespan
Applications and Use Cases
- Industrial PLC and Controller Power: Provides stable 12V DC for programmable logic controllers, motion controllers, and distributed I/O modules in manufacturing automation systems requiring high reliability
- Building Automation Systems: Powers access control systems, lighting controllers, and HVAC management units in commercial buildings where DIN-rail mounting in control panels is standard practice
- Telecommunications Equipment: Supplies regulated power to telecom switching equipment, VoIP gateways, and network interface modules requiring isolated DC power with wide input tolerance
- Industrial Sensor Networks: Delivers power to pressure transducers, temperature sensors, and proximity switches in harsh factory environments with voltage fluctuations and electrical noise
- UPS and Battery Charging Systems: Serves as primary power source for uninterruptible power supply systems and battery charging circuits in critical infrastructure applications
- LED Lighting Control: Powers LED driver circuits and dimming controllers in industrial lighting systems requiring stable 12V DC with protection against short circuits
- Machine Tool Control Cabinets: Supplies power to spindle drives, coolant pumps, and safety relay modules in CNC machines and automated manufacturing equipment
How to Use
Installation of the Mornsun LI100-20B12PR2 requires mounting the unit vertically on a standard 35mm DIN-rail within an enclosed control panel. Position the supply away from direct heat sources and ensure minimum 50mm clearance above and below the unit for adequate convection cooling. Connect the AC input terminals (L and N) to your facility's main power distribution, ensuring proper grounding through the protective earth (PE) terminal. Use appropriately rated cable gauge: minimum 1.5mm squared copper for input connections at 100W load, and minimum 2.5mm squared for output connections to handle the full 8.3A output current without excessive voltage drop.
Before applying power, verify all connections are secure and insulated. The output terminals deliver 12V DC with the positive terminal marked red and negative terminal marked black. Connect your load circuits in parallel to the output terminals, ensuring total current does not exceed 8.3A continuous rating. The unit will automatically activate its thermal shutdown protection if internal temperature exceeds safe limits, typically when ambient temperature exceeds 70 degrees Celsius or ventilation is severely restricted. Allow the supply to cool before restarting. For applications requiring redundancy or higher current capacity, multiple units can be connected in parallel by connecting positive terminals together and negative terminals together, though this requires load sharing current limiting circuits for optimal performance.
Frequently Asked Questions
What is the difference between the LI100-20B12PR2 and other Mornsun 100W supplies?
The LI100-20B12PR2 specifically delivers 12V DC output at 8.3A, making it ideal for standard industrial control applications. Other variants in the LI100 series offer different output voltages (5V, 24V, 48V) and current ratings. The PR2 designation indicates this is a second-generation design with improved EMC performance and faster transient response compared to earlier versions. Always verify the output voltage specification matches your application requirements before ordering.
Can I use this power supply with 110V or 220V input without any modifications?
Yes, the LI100-20B12PR2 automatically accepts both 110V and 220V AC input within its specified 85-264V range without any manual switching or modifications. The internal circuitry automatically adjusts to the input voltage presented. This universal input capability eliminates the need to stock separate power supplies for different facility locations or international installations.
What protection does this supply provide against short circuits?
The LI100-20B12PR2 includes built-in short-circuit protection (SCP) that automatically limits output current to approximately 110% of rated current when a short circuit is detected. This current-limiting behavior prevents catastrophic failure of the power supply and connected equipment. The protection is automatic and non-latching, meaning the supply will recover normal operation once the short circuit is removed. However, for critical applications, external fusing is still recommended as an additional safety layer.
What is the isolation voltage rating and why is it important?
The LI100-20B12PR2 provides 3000V DC isolation between the AC input side and 12V DC output side. This isolation prevents dangerous ground loops when the power supply is used in systems with multiple voltage levels or when connected to equipment with different grounding schemes. The isolation also provides electrical safety protection and reduces conducted noise coupling from the high-frequency switching circuits into sensitive measurement circuits. This isolation is maintained continuously during normal operation.
How much heat does this supply generate and what cooling is required?
At full 100W output load with greater than 85% efficiency, the LI100-20B12PR2 generates approximately 15-18W of heat. This is dissipated through the metal enclosure via natural convection. Ensure minimum 50mm clearance above and below the unit for adequate air circulation. In confined spaces or high-ambient-temperature environments above 50 degrees Celsius, consider installing a small cabinet cooling fan to maintain internal temperatures below the 70-degree Celsius thermal shutdown threshold. Proper ventilation extends the supply's operational lifespan significantly.
Can I parallel multiple LI100-20B12PR2 units for higher current output?
Multiple units can be connected in parallel by connecting all positive terminals together and all negative terminals together to achieve combined current capacity. However, without active load-sharing circuits, the unit with lower output voltage will supply more current than the others, potentially causing unequal stress. For reliable parallel operation, implement current-sharing modules or use external current-limiting resistors (typically 0.1 ohm, 5W per unit) in series with each output. This ensures balanced current distribution and prevents any single unit from being overloaded.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return
Buy Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply Online in India
Purchase the Mornsun LI100-20B12PR2 AC/DC 100W DIN-Rail Power Supply online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.
Our team in Bengaluru is available 24/7 to support your journey from product selection to project completion.