The MEAN WELL SDR-480-24 is a 480W, 24V DC, 20A single-output DIN rail switching power supply designed for industrial and automation applications. It accepts a universal AC input range of 88 to 264VAC (47 to 63Hz) or 124 to 370VDC, supporting use across a wide range of global power environments. Built-in protections for short-circuit, overload, overvoltage, and overtemperature conditions help safeguard connected equipment within the manufacturer's stated limits. Every unit undergoes a 100% full-load burn-in test before shipment.
Key Features and Benefits
Universal AC input range (88 to 264VAC, 47 to 63Hz) or DC input (124 to 370VDC) - Supports use with a wide range of global power sources without requiring a separate input selector.
Built-in protections: short-circuit, overload, overvoltage, and overtemperature - Helps safeguard connected equipment and the power supply itself within the manufacturer's stated limits.
High efficiency up to 94% - Reduces wasted energy and heat generation within rated operating conditions, supporting thermal management in enclosed cabinets.
Cooling by free air convection - no fan required - Eliminates fan noise and fan-related maintenance concerns in installations where quiet or low-maintenance operation is preferred.
Built-in DC OK relay contact - Provides a remote output status signal, supporting system monitoring and fault detection in automation and control applications.
150% peak load capability for short-term overload conditions - Helps handle temporary load spikes common in motor-start or inrush scenarios within industrial systems.
Soft-start circuit limits AC inrush surge current at power-on - Helps reduce stress on upstream fusing and wiring during startup.
Active Power Factor Correction (PFC) - Helps improve power factor and reduce harmonic distortion on the AC supply line.
DIN rail mount for TS-35 rail (7.5 mm or 15 mm height) - Simplifies installation in standard industrial control cabinets and enclosures - confirm rail type and available panel depth before ordering.
The SDR-480-24 is rated for 480W continuous output at 24VDC / 20A. Verify that ambient temperature and airflow conditions remain within the manufacturer's stated operating range (-25°C to 70°C) and consult the datasheet for any derating guidelines at elevated temperatures.
What DIN rail type is required for mounting?
The SDR-480-24 is designed to mount on a TS-35 DIN rail with a height of 7.5 mm or 15 mm. Confirm that your enclosure accommodates the unit's dimensions (approximately 4.93 x 3.37 x 5.06 inches) and provides adequate clearance for convection cooling.
Does this power supply require a fan for cooling?
No. The SDR-480-24 uses free air convection cooling and does not include a fan. Ensure the installation location provides sufficient airflow around the unit as described in the datasheet.
What input voltage does the SDR-480-24 accept?
It accepts a universal AC input of 88 to 264VAC at 47 to 63Hz, or a DC input of 124 to 370VDC. This broad input range supports use with both 115V and 230V AC mains without manual switching.
What certifications and agency approvals does this unit carry?
Agency approvals listed for the SDR-480-24 are: UL, CUL, TUV, CB, CE, EN, EAC, and SEMI. Verify that the specific approval marks required for your application and jurisdiction are confirmed in the manufacturer's documentation before installation.
Customer Concerns
Will the fanless design cause overheating in a densely packed control cabinet?
The SDR-480-24 relies on free air convection for cooling, so adequate clearance and airflow around the unit are important. The operating temperature range is -25°C to 70°C. Review the datasheet for installation spacing recommendations and any derating requirements at higher ambient temperatures before finalizing your enclosure layout.
Is 480W enough headroom for my application, or will the supply trip on overload?
The SDR-480-24 is rated for 480W continuous output and supports up to 150% peak load for short-term overload conditions. For reliable operation, size your total connected load within the 480W / 20A continuous rating and account for startup inrush currents. The built-in soft-start circuit helps limit AC inrush at power-on.
How do I know if the output is healthy during operation?
The SDR-480-24 includes a built-in DC OK relay contact that provides a remote output status signal. This can be wired into a PLC or monitoring system to indicate whether the output voltage is within normal operating range, supporting fault detection without additional external sensing hardware.
