Technical Information & Details about the MEAN WELL HDR-30-48 Power Supply Output Power: 36 W Output Voltage: 48 V DC Output Current: 0.75 A Current Range: 0 – 0.75 A Input Voltage Range: 85 – 264 V AC (277 V AC operational) / 120 – 370 V DC (390 V DC operational), 47 – 63 Hz Efficiency: up to 90 % Ripple & Noise: ≤ 240 mVp-p Output Voltage Adjustment Range: 43.2 – 55.2 V DC Voltage Tolerance: ±1.0 % Line Regulation: ±1.0 % Load Regulation: ±1.0 % Setup, Rise Time: 500 ms, 50 ms @230 V AC / 115 V AC (full load) Hold-up Time: 30 ms @230 V AC / 12 ms @115 V AC (full load) Inrush Current: 25 A @115 V AC / 45 A @230 V AC (cold start) No-load Power Consumption: < 0.3 W Operating Temperature: −30 °C to +70 °C (with derating according to curve) Cooling: fanless free air convection Protection Functions: short circuit (hiccup mode, auto recovery), overload (constant current limiting 50–100 % of rated output voltage, auto recovery), overvoltage (shut down, re‑power to recover) Overvoltage Category: OVC III (up to 2000 m altitude) Isolation Voltage: 4000 V AC between input and output Isolation Resistance: ≥ 100 MΩ @ 500 V DC, 25 °C, 70 % RH Dimensions (W x H x D): 35 mm x 90 mm x 54.5 mm Weight: approx. 130 g Housing Material: insulating plastic, Class II Mounting: DIN rail TS35/7.5 or TS35/15 Safety & EMC Certifications: UL 62368-1, UL 508, TUV BS EN/EN 61558-2-16, BS EN/EN 61558-1, IEC 62368-1, EAC TP TC 004, BSMI, BIS IS13252, compliant with BS EN/EN 55032, BS EN/EN 55035, BS EN/EN 61000-6-2, BS EN/EN 61204-3 LED Indicator: Power On LED indicator Manufacturer Warranty: 3 years About the MEAN WELL HDR-30-48 The MEAN WELL HDR-30-48 is a 30 W ultra-slim DIN-rail power supply that delivers a regulated 48 V DC / 0.75 A output in a compact 35 mm (2 SU) housing, ideal for narrow distribution boards and compact automation panels. Its wide 85–264 V AC / 120–370 V DC input range and high efficiency up to 90 % make it a strong choice for energy-efficient 48 V bus systems in building automation, industrial control, and communication equipment. The adjustable 43.2–55.2 V output range allows precise tuning of the 48 V rail to compensate for line voltage drops and to feed downstream DC/DC converters, field devices, and communication modules with stable supply voltage. The Class II plastic enclosure provides double insulation and enhances user safety while simplifying installation by removing the need for a protective earth connection. With fanless free air convection, very low no-load power consumption below 0.3 W, a wide operating temperature range from −30 °C to +70 °C, and comprehensive protection and certification features, the HDR-30-48 offers a robust, long-life 48 V power solution for household and industrial automation applications.

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