To ensure your returned products arrive safely and are processed without delay at Sinpro Electronics, please carefully read and comply with the following packaging, structural protection, and shipping guidelines for switching power supply (SPS) units prior to dispatch.

As the electrical safety awareness increasingly grows, the switching power supplies nowadays are designed to have a series of protection features, such as Over Voltage Protection (OVP), Over Current Protection (OCP)...etc

Direct current (DC) is an electric current that is unidirectional, providing a constant voltage or current in one direction. Electric current in dry cell, for example, flows from the positive terminal to the negative terminal in a constant direction, but the magnitude may be unstable as time passes, showing different waveforms.

Alternating current (AC) is an electric current that changes direction and magnitude periodically with time, and is presenting in Hertz (Hz), meaning the frequency in cycles per second. The frequency may vary depending on the country. Alternating current can be transmitted effectively with less loss-producing, and can convert the mechanical energy into electrical energy. Through a voltage transformer, the AC voltage can be adjusted; therefore, AC is the type of electric current that is mostly used by electric power companies for transmitting electricity.

Learn how to choose the right power supply unit (PSU). Check key factors including application specs, wattage determination, efficiency ratings, and PSU robustness.

A power supply, also known as a power supply unit or PSU, is a device that generally converts the alternating current (AC) into low-voltage regulated direct current (DC) power (AC/DC), or converts the direct current (DC) into low-voltage regulated direct current (DC) power (DC/DC) to ensure the electronic components can work properly. Each internal component of an electronic device needs a particular voltage; hence, the PSU can usually provide more than one DC voltage at the same time.

Date code tracking at Sinpro relies on a strict Year-Week-Serial structure. Easily trace your power supply production lot number and manufacturing date to ensure component longevity and full warranty alignment. Read our guide.

The model name of a product is composed of three English letters and a set of numbers (usually the wattage).

PFD(Power Fail Detector): A PFD monitors the conditions of a power supply, judges the upcoming malfunction, and calculates the time of early warning. The signal of early warning is a 5V TTL signal in general.
PFD(Power Fail Detector): PFD provides a function that monitors the condition of equipment, "t" is the early warning period time that judges the upcoming malfunction. The warning signal is generally a 5V TTL.

Single Output
The positive electrode: Vout
The negative electrode: RTN

Multiple Output
The positive electrode: Vo1, Vo2, …
The negative electrode: COM

Class I power safety grounding guide: Connect the ground wire via an O or Y terminal to the fixing bolt marked with the safety ground sign. Ensure full electrical safety for your system. Click to read the installation manual.

Hot swap power supply: A hot swap power supply can be replaced when the equipment is power-on and functioning normally. Two hot swap power supplies for a set, and they share quantities of supplying power equally.