What is the maximum voltage and amperage for the Dell 7.4mm x5mm barrel connector male?
What is the maximum voltage and amperage for the Dell 7.4mm x5mm barrel connector male?
Looking into the specifications for a Dell 7.4mm barrel connector male, I need to confirm the maximum voltage and amperage ratings. Checking the details, it seems suitable for running 27 volts at 18.50 amps.
HDPLEX HIFI DC-ATX 500 watt features an 8 pin female barrel connector as the input plug. It appears to be a custom large barrel connector. I planned to connect the male barrel to a LOP-500-27, which uses screw-in output plugs—though the exact name isn’t clear. The process is straightforward: just screw the wires in without soldering.
If the barrel connector male isn't suitable for the voltage and amperage, I'll explore an alternative. I'm considering switching to an 8-pin ATX connector. What are the maximum voltage and amperage ratings for an ATX 8-pin connector?
When discussing the 8-pin PCIe connector for a GPU card, this article provides details:
The voltage is +12V, with a maximum power output of 150W. This translates to approximately 12.5A.
For additional power requirements, you can add more leads—300W or 450W—and also utilize the 75W available from the PCIe slot.
The upper voltage limit mainly depends on the cleanliness inside, since the plug usually contains insulation that can withstand much higher voltages than what laptops typically use. To get an accurate assessment, you need a proper tool like a Megger to test the cable insulation's dielectric strength. If the plug is intact and free of damage, a reputable manufacturer would likely support 500V without problems. A 27V reading should be safe. The 18A rating is less certain; it might work for short periods, but it depends on the plug's design and contact quality.
The 7.4mm Barrel Jack connector is intended for use below the SELV limit, not for AC mains.
https://en.wikipedia.org/wiki/Extra-low_voltage
This information covers both sides, such as the socket in a Dell laptop and the plug at the end of the power cord. The combined rating is 20V DC/10A.
https://www.farnell.com/datasheets/4408834.pdf
Consensus is clear. The sheet lists an 'Insulation Resistance' of at least 100MΩ, tested at 500V DC.
The user should avoid using the 7.4mm plug above a standard 20V DC or beyond a current of 10A.
In short, yes — the connector is safe for those parameters.
From an electrical engineering perspective, I wouldn't worry about applying 27V DC at 9A, but definitely not exceeding it. It would be a significant jump to 18.5A continuously.
Thank you for your response.
The HDPLEX HI-FI DC-ATX 500 watt model includes an 8 pin or 8 wire custom barrel connector.
The 20v 10amp limit makes it challenging to stick with the barrel connector as planned; I’ll need to make some changes.
What type of connector would suit a continuous 27v 18.50 amp operation?
Is there a robust medical-grade 8 pin connector available? I’m aware of a heavy-duty 6 pin medical connector.
I’m attempting to run the HDPLEX HIFI DC-ATX 500 watt power supply using a Mean Well LOP-500-27, which has an 8 pin DC input.
I’ll have to build a custom setup or solder thick wire directly.
Soldering directly seems most feasible. I’ve already removed the modular ports from the power supply, so modifications are well underway.