Mean Well LRS-350-24 Switching Power Supply

The Mean Well LRS-350-24 is a 350W single-output enclosed-type AC-to-DC switching power supply, specifically providing a $24 VDC$ output at a rated current of $14.6 A$ . This model features an ultra-compact, low-profile design of $1 U$ ( $30 mm$ height) and uses a user-selectable input voltage switch for operation at either $115 VAC$ or $230 VAC$ (with a range of $90$ to $132 VAC$ or $180$ to $264 VAC$ ). It boasts high efficiency (typically $88%$ ), extremely low no-load power consumption (less than $0.75 W$ ), and a high operating temperature range from $- 2 5^{\circ} C$ to $+ 7 0^{\circ} C$ with a built-in long-life DC fan and fan ON-OFF control. The robust unit is designed for reliable performance in demanding environments, offering $5 G$ anti-vibration capability and comprehensive protections against short circuit, overload, over voltage, and over temperature. Serving as a high price-to-performance solution, the LRS-350-24 is widely used in various industrial applications like automation machinery, control systems, and mechanical/electrical equipment.

Technical Specification

General / Electrical

Parameter	Value / Range
Model / Series	LRS‑350 series, 24 V output
Output Voltage	24 V DC nominal
Output Current	14.6 A
Output Power	350.4 W
Input Voltage (AC)	90‑132 VAC / 180‑264 VAC (selectable)
Input Voltage (DC)	240‑370 VDC (if AC switch set to 230 V)
Input Frequency	47‑63 Hz
Efficiency (typical)	~ 88 %
No-load Power Consumption	< 0.75 W
Inrush Current (typical)	60 A (both 115 V and 230 V)
Leakage Current	< 2 mA (at 240 VAC)

Regulation & Performance

Parameter	Value / Tolerance
Voltage Adjustment Range	21.6 V to 28.8 V
Line Regulation	±0.5 %
Load Regulation	±0.5 %
Ripple & Noise (max)	150 mVpp
Setup & Rise Time	1300 ms / 50 ms (at full load, 230 VAC)
Hold-up Time (typical)	16 ms (230 VAC), 12 ms (115 VAC)
Temp. Coefficient	±0.03 % / °C (0‑50 °C)

Protections & Features

Feature	Description
Overload Protection	110 % to 140 % of rated output power — hiccup mode, auto-recovery
Overvoltage Protection	Trip range for 24 V model: ~ 28.8 V to 33.6 V — hiccup mode, auto-recovery
Over Temperature Protection	Hiccup mode (recovers automatically)
Fan Control	Fan turns on when internal temperature ≥ 50 °C, off when ≤ 40 °C
Vibration	10‑500 Hz, 5G, 10 min / cycle, 60 min each in X, Y, Z axes
Surge Withstand	Can tolerate 300 VAC surge for 5 sec

Isolation, Safety & EMC

Parameter	Value
I/P – O/P Withstand Voltage	3 kVAC
I/P – FG Withstand Voltage	2 kVAC
O/P – FG Withstand Voltage	0.5 kVAC
Isolation Resistance	≥ 100 MΩ / 500 VDC (I/P‑O/P, I/P‑FG, O/P‑FG)
Safety Standards	IEC/UL 62368‑1, BSMI, EAC, KC (for the 12/24 V versions), etc.
EMC Emission / Immunity	Meets relevant standards (for LRS‑350‑12/24 variants)

Environmental & Mechanical

Parameter	Value
Operating Temperature	–25 °C to +70 °C (with derating above certain temperatures)
Storage Temperature / Humidity	–40 °C to +85 °C, 10 % – 95 % RH non-condensing
Operating Humidity	20 % – 90 % RH (non-condensing)
Dimensions (L × W × H)	215 × 115 × 30 mm
Weight	~ 0.76 kg
MTBF	2,099,900 hrs (per Telcordia SR‑332) / ~ 328,600 hrs (MIL‑HDBK‑217F @ 25 °C)