For 3D printing enthusiasts, especially those building DIY printers, selecting the right power supply is crucial. Two popular options are the LRS and UHP series from Mean Well. Here's a simplified guide to help you decide:
LRS Series: Affordable and Reliable
- Suitable for budget constraint projects and industrial environments where fan noise or dust accumulation is not a concern for larger wattage above 200 watts, where the peak loads is uncommon so fan runtime is much lower.
- Ideal for well-ventilated cabinets and standard 1U racks, as its much thinner in profile compare to UHP.
- Requires periodic fan maintenance to prevent overheating for 200 watts higher sizes due those version are not fan less.
UHP Series: Power Efficient and Reliable
- Designed for noise-sensitive applications, space-constrained systems, and harsh environments with better components
- Offers a fan less design, making it virtually maintenance-free (unlike LRS for over 200 watts)
- Suitable for critical reliability applications, such as mission-critical infrastructure where minimal maintenance is a must.
- More power efficient compare to LRS up to 95% power efficiency compare to 89% LRS, with Active PFC.
| Mean Well LRS Series (e.g., LRS-350) | Mean Well UHP Series (e.g., UHP-350) | |
| Cooling Mechanism |
Forced air via internal DC fan (for larger wattage) |
Conduction and convection (Fanless) |
| PFC Implementation |
Non-PFC (on mid-wattage models) |
Active PFC (Built-in) |
| Conversion Efficiency |
88.0% – 89.0% (Typ.) |
94.0% – 95.0% (Typ.) |
| Chassis Profile |
30.0mm (Standard 1U) |
26.0mm – 31.0mm (Ultra-slim) |
| Input Logic |
Switch-selectable (115/230VAC) |
Universal (90 – 264VAC) |
| Peak Load Capacity |
Standard current rating |
150% Peak (100ms duration) |
| Operating Altitude |
5,000 meters |
5,000 meters |
| Vibration Rating |
5G acceleration |
5G acceleration |
| Protection Suites |
OVP, OCP, OTP, Short Circuit |
OVP, OCP, OTP, Short Circuit |
Key Considerations
- Noise: If you need a silent build with higher wattage requirements at higher constant load, choose the UHP series.
- Space: If you have limited space, the UHP series can be a better fit where height isn't a concern, the LRS would be better if height is a concern, so its would depend on install location.
- Environment: If your printer is in a dusty or harsh environment, the UHP series is a better choice, as does not require fan active cooling which over time dust can be build up.
- Budget: If you're on a tight budget, the LRS series is more be sufficient for most 3D Printers Builds, compare to unbranded generic power supplies, as Mean Well is well known for their reliable power supplies.
Reliability and Failure Mode Analysis
The reliability of both series is governed by the Arrhenius Equation, which states that the rate of chemical reactions doubles for every increase in temperature. The UHP series is more reliable in high-duty-cycle industrial applications due to its fanless design, which eliminates a potential failure point (the moving part, the fan).
In Summary
- LRS series: affordable, reliable, and suitable for most 3D printing applications
- UHP series: premium, reliable, and designed for noise-sensitive, space-constrained, and harsh environments
When choosing between the LRS and UHP series, consider your specific needs and priorities. If you want a cost-effective solution for a non-noise-sensitive application, the LRS series might be the way to go. However, if you prioritise silence, slimness, and long-term reliability, the UHP series is the better choice. Otherwise you cannot go wrong with either choice, if you're replacing existing power supply due to fault, its best to match wattage/voltage you need and profiles that will fit, in most case most 3D Printer use a version/copy of LRS so you may find most LRS will exact match with your stock printer power supply.
At DREMC we stock original genuine power supply from Mean Well, source from approved distributor to ensure item is original and we batch check serials to Mean Well serials checker and recorded for each order for easier and quicker tractability.