240W Semi-Potted AC-DC Switching Power Supply with Fanless, High-Reliability Design

ARCH AC-DC Switching Power Supply ARF240U

ARCH AC-DC Switching Power Supply ARF240E

240W Semi-Potted AC-DC Switching Power Supply with Fanless, High-Reliability Design

ARF240 Series

More Power in Less Space — Rugged, High-Efficiency Performance for Harsh Environments, Available in Open Frame, U Bracket & Enclosed Options

The ARCH ARF240 240W Semi-Potted AC-DC Switching Power Supply is designed for environments where reliability and durability are critical. Unlike traditional open-frame models, the semi-potted construction offers enhanced resistance to humidity, vibration, and dust, boosting mechanical strength and environmental resilience. The fanless architecture not only eliminates the risk of fan failure but also helps extend the lifespan of the end product, making it a dependable choice for long-term applications.

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More Power in the Same Class

In a market where most comparable fanless, semi-potted power supplies are rated at 200W, the ARF240 switching power supply delivers a full 240W output, offering 20% more power within a similar footprint. This means system designers can achieve higher power density without increasing system size—an ideal advantage for compact industrial and embedded systems.

Outstanding Thermal Performance in Extreme Conditions

The ARF240 switching power supply excels in thermal management, with a wide operating temperature range of -30°C to +80°C, outperforming competitors which typically tops out at +70°C. This extended range allows for safe, stable operation in both extremely hot and cold environments. The design also supports operation at altitudes up to 5000 meters, enabling use in high-altitude or mission-critical scenarios.

Ultra-Low Standby Power and High Efficiency

With standby power consumption below 0.5W, the ARF240 switching power supply meets modern energy-saving requirements, making it ideal for systems that prioritize eco-conscious design. The switching power supply also features active Power Factor Correction (PFC) and delivers an exceptional efficiency of up to 94%, reducing heat generation and power waste—helping your systems run cooler and more efficiently.

Superior Safety and Insulation Standards

The ARF240 switching power supply offers 4000VAC input-to-output isolation, which is higher than competitors (typically 3750VAC), ensuring stronger electrical protection. Certified to global safety standards including UL, IEC, and EN 62368-1, the ARF240 switching power supply provides reliable compliance and user safety. Its compact design further strengthens its appeal for space-limited applications, offering performance without compromising on size.

Designed for Demanding Industrial Applications

From factory automation to smart infrastructure and edge computing, the ARF240 Switching Power Supply delivers a highly durable, high-power solution built to withstand harsh environments. With its semi-potted, fanless build, industry-leading efficiency, and higher output wattage, it’s the perfect choice for engineers seeking reliability, power, and long-term performance in one package.

Key Features

Enclosed / Open Frame / U Bracket Package.
Universal Input Range 90 - 264VAC.
Over-Voltage Category OVC III.
Low No-Load Power Consumption < 0.5W.
High Efficiency up to 94%.
Low Leakage Current < 0.75mA / 264 VAC (Touch Current).
Wide Operating Temperature: -40°C ~ +80°C with derating
I/O Isolation: 4250VAC
Operating Altitude 5000M.
Active PFC Function.
Built-in 12V / 0.5A Fan Supply (ARF240O N/A).
Safety Approval to UL / IEC / EN 62368-1.
3-Year Product Warranty.

Applications

Industrial Automation Systems
Automotive Electronic Equipment
Automated Ordering Kiosk
Communication Equipment
IoT (Smart City)
Mechanical Equipment

Specification

Series	ARF240O	ARF240U	ARF240E
Dimensions (L x W x H) (Tolerance ± 0.5 mm)	101.9 x 52.1 x 27.6 mm 4.02 x 2.05 x 1.09 inches	104.0 x 62.5 x 39.2 mm 4.1 x 2.46 x 1.54 inches	104.0 x 62.5 x 39.2 mm 4.1 x 2.46 x 1.54 inches
Cooling Method	Free Air Convection / 8 CFM FAN / Conduction Cooling
AC Input Voltage Range	90-264 VAC
AC Inrush Current	<45 A max. (115 VAC) / <90 A max. (230 VAC)
Leakage Current	<0.75 mA / 264 VAC (Touch Current)
Output Voltage Accuracy	± 2%
Output Voltage Adj. Range	± 5% Output Voltage
Ripple and Noise (Vp-p.)	1% Vout (max.)
Over Power Protection	Auto recovery (110%-210%), Hiccup Mode
Over Voltage Protection	Auto recovery
Over Temperature Protection	Auto recovery
Short Circuit Protection	Protection level 1 (nominal): Continuous, Auto recovery; Protection level 2 (instantaneous high current): Latch
Isolation Input-Output	4250 VAC
Operating Temperature	-40°C to +80°C
Temperature Coefficient	± 0.05%/°C
Safety Approval	UL / IEC / EN 62368-1
EMI	Conducted: EN 55032 Class B; Radiated: EN 55032 Class I Class B / Class II Class A
EMS	EN 55035