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DC Power Supply Variable, Bench Power Supply with Output Switch, Short Circuit Alarm, Adjustable Switching Regulated Power Supply 30V 10A with 4-Digits LED Power Display, USB Quick-Charge Interface

TLDR Review: "Variable DC Power Supply 30V 10A"

Item: "Variable DC Power Supply 30V 10A"
Author: ShopSavvy

By ShopSavvy Team

Published: February 24th, 2026

Pros

•Provides a steady and reliable 30V output with precise voltage adjustment in 0.1V increments via a clickable knob.
•Voltage can be adjusted without turning off output; new voltage blinks for 3 seconds before applying, enhancing ease of use.
•Features two current modes: Constant Current mode automatically maintains current by adjusting voltage, and Over Current Protection (OCP) mode shuts off output with an alarm (which can be disabled).
•Voltage and current readings are highly accurate, adjustable to the third decimal place.
•Clear white igit LED display is easily visible from a distance, a notable improvement over common red displays.
•Automatically switches between constant current and constant voltage modes, making it ideal for charging unprotected lithium batteries.
•Simple and straightforward operation: set voltage, connect device, enable output.
•Compact and weluilt design with good quality components ensures durability and reliability.
•Suitable for powering a variety of devices requiring stable DC power and can handle occasional extended use (tested up to 17 months).

Cons

•Slight delay (~1 second) before the display updates to show the actual output values after adjustments.
•Overcurrent protection (OCP) only works correctly above 100mA, limiting its effectiveness for very low current applications.
•Using OCP below 100mA requires a complicated workaround involving disconnecting the load and adjusting limits in stages, which is inconvenient.
•Input voltage switch must be manually checked and set correctly before powering on to prevent damage — an easy step to overlook.
•Cooling design may be insufficient for prolonged heavy use near the 300W max output, especially in warm environments.
•Older units lacked a ground terminal; newer ones include a green ground terminal that is not connected to the case, which might confuse users.
•Terminals lack holes in studs, necessitating the purchase of banana plugs with set screws for secure wiring.
•Some older units showed failures over time, though newer models have improved reliability.

Bottom Line

This DC Power Supply Variable 30V 10A strikes a solid balance between accuracy, functionality, and ease of use for hobbyists or light lab work needing stable DC power. The precise voltage control, clear display, and automatic mode switching are definite pluses. However, if you need reliable overcurrent protection below 100mA or plan heavy continuous 300W use, the quirks and cooling limits might cause frustration. Double-check your input voltage setting to avoid mishaps. For a similar bench power supply with a proven track record and perhaps more professional features, you might want to explore other brands or models focused on heavy-duty or refined current control, though none of the listed comparable products here provide a distinct alternative at this time. If you want a versatile and user-friendly power supply for general use, this is a reliable choice worth considering.