Best Open Frame Power Supplies for Fixing Projects and Custom Builds
Finding the right open frame power supply means balancing voltage stability, current capability, and form factor for your project. This guide highlights five open frame models that appeal to hobbyists, engineers, and IT enthusiasts building custom electronics or network gear. Each choice targets different needs—from compact dual-output units to higher wattage telecom power supplies. The buyer’s intent is to identify reliable 24V and 48V options with clear specs and practical use cases.
| Product | Best For | Key Feature | Output |
|---|---|---|---|
| MEAN WELL PD-2515 | Dual 15V supply needs | Open frame with +15V output | 24W total |
| Mikrotik PW48V-12V85W | -48V telecom rack setups | ±48V capable, 12V 7A | 84W |
| Mean Well PD-65A | Dual output, higher wattage | 61.6W, 5A per output or total | Dual outputs |
| Mikrotik PW48V-12V85W (General) | General 48V telecom use | Open frame, telecom grade | 84W |
| MEAN WELL EPP-120S-24 | Compact 24V power needs | 24V, 5A, 120W | 24V / 5A |
Note: When selecting open frame supplies, consider enclosure fit, mounting options, wiring gauge, and required protection features (short-circuit, over-voltage). The following sections summarize five relevant products, with clear use cases and practical cautions.
MEAN WELL PD-2515 Open Frame Dual Output
The MEAN WELL PD-2515 provides a primary +15V output with a secondary capacity suitable for light load expansion. Best for projects requiring a dedicated +15V rail, such as small servo drives or sensor arrays. The unit is compact, making it suitable for tight enclosures. Limitation: the single main output may constrain higher current needs beyond 1 A if a second rail is not used. Suitable for hobbyist and small-scale lab setups.
MikroTik PW48V-12V85W Open Frame
This open frame supply is designed for telecom-style installations using a -48 V system with a 12 V output at 7 A. It’s best for MikroTik-based networking gear and other devices that require a -48 V backbone. Best for users upgrading Cloud Core Routers or similar equipment. Caution: intended primarily for -48 V telecom environments; ensure compatibility with non-telecom gear before use.
Mean Well PD-65A Open Frame Power Supply
The PD-65A offers a robust dual-output option with higher overall wattage (61.6 W) and good regulation. It suits applications requiring simultaneous, stable outputs and protection features such as short-circuit and over-voltage. Best for compact lab benches or equipment enclosures where multiple 5 V or 12 V rails are needed. Caution: verify that the dual outputs meet your exact voltage/current requirements to avoid overloading either rail.
MEAN WELL EPS-65-24 Open Frame
The EPS-65-24 provides a 24 V output at 3 A, totaling 72 W. This makes it suitable for devices needing a reliable 24 V rail with ample headroom for transient loads. Best for network equipment, small servers, or lighting drivers where a single, steady 24 V source is preferred. Limitation: the single 24 V rail may require additional regulation for sensitive components if ripple or transient demands are high, so consider extra filtering if necessary.
Mean Well EPP-120S-24 Open Frame
The EPP-120S-24 is a compact 24 V, 5 A open frame supply rated at 120 W. It is well-suited for compact equipment racks or embedded systems that require a higher current at 24 V. Best for compact servers, PoE lighting drivers, or industrial control panels. Caution: ensure mounting clearance and cooling for 120 W load in your enclosure to prevent overheating.
MEAN WELL EPS-65-24 Open Frame (Alternate)
Note: This entry reiterates the 24 V, 3 A configuration for emphasis on single-rail stability. Best for applications prioritizing a dedicated 24 V rail with moderate current. Better for small, fixed installations than for high-dynamic loads. Avoid if you require dual rails or higher wattage without additional modules.
Buying Guide — Open Frame Power Supplies
What should you consider when choosing an open frame supply?
- Voltage and current requirements: Match the main output to device needs; check ripple, load regulation, and peak currents.
- Number of outputs: Decide if you need single, dual, or multiple rails. Dual-output units are convenient for distributed systems.
- Protection features: Look for short-circuit, over-voltage, overload protection, and safety certifications as applicable to your region.
- Form factor and mounting: Confirm the open-frame dimensions fit your enclosure and mounting style (DIN rail, panel mount, etc.).
- Efficiency and thermal management: Higher wattage can require better cooling; consider enclosure ventilation and ambient temperature.
Practical Selection Scenarios
- Small electronics lab with a single +15V rail: MEAN WELL PD-2515 can be a straightforward fit.
- Telecom-style networking rack requiring -48 V operation plus a 12 V rail: MikroTik PW48V-12V85W is a targeted choice.
- Compact server or switch enclosure needing a robust 24 V rail: MEAN WELL EPS-65-24 or MEAN WELL EPP-120S-24 are strong options.
Frequently Asked Questions
- What is an open frame power supply used for?
Open frame supplies are designed for integration inside equipment enclosures, providing power to internal components with mounting flexibility. - Do I need dual outputs for my project?
If your device requires two separate rails with distinct voltages or current specs, a dual-output supply simplifies wiring and reduces the need for multiple adapters. - Are these supplies suitable for telecom equipment?
Some models are designed with telecom voltages (like -48 V) and can be appropriate for such environments when compatible with the equipment. - What safety features should I look for?
Short-circuit protection, over-voltage protection, and proper certifications improve reliability in installation environments. - Can I install these without professional help?
Basic projects may be feasible for experienced hobbyists; for critical or high-power deployments, follow manufacturer guidelines and local electrical codes. - How do I choose the right wattage?
Pick a supply with adequate headroom above the device’s continuous load, and ensure margins for startup surges or transient draws.