Mean Well MSP-300-5 Enclosed Power Supply

A 5 V, 60 A supply built to medical-safety standards

The Mean Well MSP-300-5 is a 300 W enclosed power supply with a 5 V DC output at 60 A. The MSP-300 series is designed to the medical safety standard IEC 60601-1, with a primary-to-secondary isolation of 2 x MOOP and a primary-to-earth isolation of 1 x MOOP, and a case height of 41 mm.

The input range is 85 to 264 VAC (120 to 370 VDC) with active PFC (above 0.95 at 230 VAC). Efficiency at 5 V is 82% and the working temperature range is -40 to +70 C. Earth leakage current is below 450 uA and touch leakage current below 100 uA at 264 VAC. A 5 V standby output, DC OK signal, remote ON/OFF, remote sense and fan control are built in.

Technical specifications

What the medical standard means in practice

IEC 60601-1 sets requirements for leakage current, isolation and creepage that are stricter than for ordinary industrial supplies. The datasheet states the isolation level in terms of means of patient protection (MOOP). A power supply certified as a component does not make the finished equipment compliant, so the equipment maker must assess the end product and its risk management file. Industrial users sometimes choose a medical-grade supply simply for the low leakage current.

5 V at 60 A: installation notes

At 60 A the output cables and terminals carry significant current, so use appropriately sized conductors and keep runs short or use the remote sense terminals to compensate the voltage drop. The 5 V standby rail remains available when the main output is turned off by the remote control input. Fan control starts the fan above about 35 percent load or at a temperature threshold; apply the derating curve for warm cabinets. Observe the 2.25 A at 230 VAC input current when sizing the circuit breaker, with cold-start inrush of 70 A. Keep the earth connection short and secure, because the low leakage current rating depends on a proper protective earth connection.

Documents and quotation

The official manufacturer datasheet is linked in the Datasheet & Documentation section at the end of this page. When requesting a price for MSP-300-5, include how many units you need, the incoming supply, the continuous and peak load, the temperature around the unit and certifications you must meet. See also Power Modules.

Reliability, EMC and environmental data for the Mean Well MSP-300-5

The values below are taken from the official Mean Well MSP-300 specification and complement the main table above.

How the MSP-300-5 works

The MSP-300-5 is a medical-grade enclosed supply. Its block diagram shows an EMI filter and rectifiers, an active PFC stage, a PWM power switching stage, and output rectifiers and filter that deliver the isolated 5 V rail. The insulation between input and output withstands 4 kVAC. Protection covers short circuit, overload, over-voltage and over-temperature, and a built-in fan switches on at about 35±15% load.

Medical EMC is covered by EN 60601-1-2, and emission meets EN 55011 Class B. Confirm the exact certification scope for your equipment class in the datasheet.

Selection & Ordering Guide

The MSP-300 series offers:

• MSP-300-3.3: 3.3 V, 60 A
• MSP-300-5: 5 V, 60 A
• MSP-300-7.5: 7.5 V, 40 A
• MSP-300-12: 12 V, 27 A
• MSP-300-15: 15 V, 22 A
• MSP-300-24: 24 V, 14 A
• MSP-300-36: 36 V, 9 A
• MSP-300-48: 48 V, 7 A

Choose the MSP-300-5 when medical or healthcare equipment needs a 5 V rail up to 60 A.

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 MSP-300-5 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

In Oman and the GCC the MSP-300-5 is used by equipment builders and maintenance teams for medical devices, diagnostic and laboratory instruments, and healthcare IT equipment that needs a high-current 5 V supply with medical insulation.

Why Source from Seven Star LLC

Seven Star LLC supplies Mean Well products, including the MSP-300-5, 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 MSP-300 documentation before you order.