Mean Well LRS-150-48 Enclosed Switching Power Supply

A low-profile 48 V enclosed supply for machine builders

The Mean Well LRS-150-48 is a 158.4 W enclosed-type switching power supply with a 48 V DC output at 3.3 A. The LRS-150 series is built in a metallic mesh case only 30 mm high, and the input is selected with a switch between 85 to 132 VAC and 170 to 264 VAC, so the unit is chosen for chassis and panel mounting rather than rail mounting.

Typical efficiency at 48 V is 90% and the series operates from -30 to +70 C with free-air convection. Mean Well lists a 5G vibration withstand and compliance with EN61558, EN50178, EN60664-1 and EN62477-1 for altitudes up to 2000 m. Protection covers short circuit, overload (hiccup mode), overvoltage and overtemperature.

Technical specifications

Why a 48 V rail

A 48 V DC rail is common for telecom and network gear, PoE injectors, small servo and stepper drives, and battery-backed systems. At 3.3 A the LRS-150-48 offers about 158 W, and the output can be trimmed between 43.2 and 52.8 V when the load or cable drop needs it. If your application needs 12 V, 24 V or 36 V, the same series is offered in those voltages; check the model table in the datasheet.

Input switch, mounting and safety notes

Set the input selector to match the supply before power-up: the switch chooses between the 115 V and 230 V ranges, and a wrong setting at the higher voltage can damage the unit. The cold-start inrush is 60 A at 230 VAC, so allow for it in breaker selection. The datasheet recommends derating at low input voltage. As an enclosed supply it has screw terminals and is installed in a cabinet that provides touch protection; the final equipment must meet its own safety and EMC requirements. Fix the supply with the mounting holes on a flat metal plate or panel, and keep wiring away from the mesh openings to avoid damage to the connections.

Documents and quotation

The official manufacturer datasheet is linked in the Datasheet & Documentation section at the end of this page. A request for LRS-150-48 should state quantity, supply conditions, load current with peaks, operating temperature and required certificates, so that the right variant is confirmed. Alternatives are listed in Power Modules.

Reliability, EMC and environmental data for the Mean Well LRS-150-48

The values below are taken from the official Mean Well LRS-150 specification and complement the main table above.

How the LRS-150-48 works

The LRS-150-48 is an enclosed single-output supply. Its block diagram shows an EMI filter and rectifiers, a PWM power switching stage at about 65 kHz, and output rectifiers and filter that deliver the isolated 48 V rail. The control loop regulates the output and the protection circuits cover short circuit, overload and over-voltage. The supply is convection cooled with a low-profile 30 mm housing.

Selection & Ordering Guide

The LRS-150 series includes these output voltages:

• LRS-150-12: 12 V DC, 12.5 A
• LRS-150-15: 15 V DC, 10 A
• LRS-150-24: 24 V DC, 6.5 A
• LRS-150-36: 36 V DC, 4.3 A
• LRS-150-48: 48 V DC, 3.3 A

Choose the LRS-150-48 for 48 V loads up to about 150 W, such as LED systems, telecom equipment or 48 V motors.

Installation & Maintenance

• Isolate and lock out the supply circuit before wiring; installation should be carried out by a qualified electrician.
• Use the conductor sizes, terminal data and protective earth connection shown in the official datasheet.
• Respect the mounting orientation and clearances given by Mean Well so that the cooling of the LRS-150-48 works as designed.
• After commissioning, measure the output voltage at the load and trim it only within the documented adjustment range.
• During planned maintenance, check terminals for tightness and discolouration, remove dust, and confirm that the cabinet temperature stays inside the derating curve.

Typical Applications in Oman & the GCC

Typical uses in Oman and the GCC include LED signage and lighting, telecom and network equipment, industrial machines, vending and retail systems, and 48 V control equipment built into closed enclosures.

Why Source from Seven Star LLC

Seven Star LLC supplies Mean Well products, including the LRS-150-48, to panel builders, contractors and maintenance teams across Oman and the GCC. Send us the model code and quantity to request a quote, and our team can help confirm the correct ordering code, the right variant and any accessories for your project. When you are replacing an existing unit, share the nameplate data and we will compare it with the official LRS-150 documentation before you order.

Wiring and commissioning notes for the LRS-150-48

Before energising the LRS-150-48, confirm that the input wiring matches the terminal markings and that the protective earth is connected. Size the output cables for the full 3.3 A load plus a margin, and keep cable runs to the loads short to limit voltage drop on the 48 V rail. After start-up, measure the output voltage at the load terminals and trim it with the adjustment potentiometer if the cable drop requires it. Check the actual enclosure temperature at full load against the derating curve in the datasheet, which is important in hot plant rooms and outdoor cabinets in Oman and the GCC.