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Specification & Description
| Specification | Description |
|---|---|
| Part Number | PU300 |
| Alternative Part Number | PU300 |
| Manufacturer | Selectron |
| Power Output | 200-300 watts continuous output power |
| Input Voltage | 90-264 VAC |
| Input Frequency | 47-63 Hz |
| Input Current | 4.7 A (rms) for 115 VAC, 2.3 A (rms) for 230 VAC |
| Earth Leakage Current | 300 μA max. @ 264 VAC, 63 Hz |
| Output Voltage/Current | Multiple models with various outputs, see rating chart |
| Ripple and Noise | 1% peak to peak maximum |
| Overvoltage Protection | Provided on output #1 only; set at 115-140% of its nominal output voltage |
| Overcurrent Protection | All outputs protected to short circuit conditions |
| Temperature Coefficient | All outputs ±0.04% / ℃ maximum |
| Transient Response | Maximum excursion of 4% or better on all models, recovering to 1% of final value within 500 us |
| Fan Power | 12 V at 350 mA maximum for B version, 12 V at 100 mA maximum for C version |
| Operating Temperature | 0 to +70℃ |
| Storage Temperature | -40 to +85℃ |
| Relative Humidity | 5% to 95% non-condensing |
| Derating | Derate from 100% at +50℃ linearly to 50% at +70℃ |
| Cooling | 35 CFM forced air cooling or convection cooling |
| Switching Frequency | 70 KHz ± 10 KHz |
| Power Factor | 0.98 typical |
| Efficiency | 70% minimum on all models |
| Hold-up Time | 12 ms minimum at 110 VAC |
| Line Regulation | ±0.2% maximum at full load |
| Inrush Current | 30 A @ 115 VAC or 60A @ 230 VAC, at 25℃ cold start |
| Withstand Voltage | 3000 VAC from input to output, 1500 VAC from input to ground, 500 VAC from output to ground |
| MTBF | 300,000 hours minimum at full load at 25℃ ambient, calculated per MIL-HDBK-217F |
| EMC Performance | Compliant with multiple EMC standards including EN55022 and EN61000 series |
| Safety Standard Approvals | UL 60950-1, CSA C22.2 No. 60950-1, TÜV EN 60950-1 |
| RoHS Compliant | Yes |
The Selectron PU300 is a versatile and robust power supply unit designed to meet the rigorous demands of industrial and Information Technology Equipment (ITE) applications. This series offers a range of models that deliver continuous output power between 200 to 300 watts, ensuring reliable performance for a variety of systems.
Crafted with precision, the PU300 series operates efficiently across a wide input voltage range of 90-264 VAC without the need for a selector strap, simplifying installation and usage. The power supplies feature multiple outputs with magnetic amplifiers to maintain tight regulation, even under dynamic load conditions.
Key features of the PU300 series include overvoltage and short-circuit protection, ensuring the longevity and safety of both the power supply and the connected equipment. The units also come with a Power Fail Detect (PFD) signal, remote sense on primary outputs, and a remote inhibit function, providing enhanced control and monitoring capabilities.
The PU300 models are constructed on a printed circuit board with a U-bracket for mechanical support and efficient heat sinking. An optional cover-and-fan assembly can be added to further enhance cooling performance. Compliance with RoHS requirements reflects the commitment to environmental responsibility.
With a focus on reliability, the PU300 series boasts a minimum Mean Time Between Failures (MTBF) of 300,000 hours at full load and 25°C ambient temperature, calculated per MIL-HDBK-217F. The power supplies also exhibit excellent EMC performance, meeting EN55022 Class B and EN61000 standards for both conducted and radiated emissions.
The PU300 series is a testament to Selectron's dedication to providing high-quality, reliable power solutions that cater to the specific needs of industrial and ITE sectors in the UK and beyond.
Commonly Asked Questions
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Frequently Asked Questions
What are the input specifications for this power supply?
The power supply operates at an input voltage range of 90-264 VAC, with an input frequency of 47-63 Hz. It has an input current of 4.7 A (rms) for 115 VAC and 2.3 A (rms) for 230 VAC. The earth leakage current is a maximum of 300 μA at 264 VAC, 63 Hz.
Can you detail the output specifications?
The output voltage and current ratings vary depending on the model, with ripple and noise at 1% peak to peak maximum. Overvoltage protection is provided on output #1 only, set at 115-140% of its nominal output voltage. All outputs are protected against short circuit conditions, and the temperature coefficient for all outputs is ±0.04%/℃ maximum.
What are the environmental specifications for this power supply?
The operating temperature range is from 0 to +70℃, and the storage temperature range is from -40 to +85℃. It can operate in relative humidity from 5% to 95% non-condensing. There is a derating from 100% at +50℃ linearly to 50% at +70℃. Cooling is achieved with 35 CFM forced air or convection.
What safety standards does this power supply comply with?
The power supply complies with UL 60950-1, CSA C22.2 No. 60950-1, and TÜV EN 60950-1 safety standards.
What are the EMC performance specifications?
The power supply meets EN55022 Class B conducted and radiated emissions, EN61000-3-2 for harmonic distortion, Class A and D, and various EN61000-4 standards for immunity to ESD, radiated immunity, fast transient/burst, surge, conducted immunity, magnetic field immunity, and voltage dip.
What is the efficiency and power factor of this power supply?
The efficiency is a minimum of 70% on all models, and the typical power factor is 0.98.
What is the hold-up time for the power supply?
The hold-up time is 12 ms minimum at 110 VAC.
What is the MTBF for this power supply?
The Mean Time Between Failures (MTBF) is calculated at 300,000 hours minimum at full load at 25℃ ambient, per MIL-HDBK-217F.
Are there any special features for monitoring or controlling the power supply?
Yes, the power supply includes a Power Fail Detect (PFD) signal that provides a TTL logic high for normal operation and TTL logic low upon loss of input power. There is also a remote sense on output #1 and #2, and a remote inhibit feature that requires a TTL high signal to disable the output.
How is the power supply cooled?
The power supply can be cooled either by 35 CFM forced air provided by the user or by convection cooling.
Part conditions explained
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