以下是一份关于S-300-12V开关电源的产品中英文介绍：

S-300-12V开关电源是一款性能卓越的电源设备，广泛应用于多种领域。其输入电压范围为170-264V，能够适应不同地区的电压波动。该电源的输出功率为300W，输出电压稳定在12V，输出电流可达25A，可为各种设备提供稳定的电力支持，如LED灯带、监控设备等。

在性能方面，S-300-12V开关电源采用脉冲宽度调制（PWM）式调制方式，工作效率高达90%，输出纹波噪音低至50mV，确保设备运行的稳定性和可靠性。其工作温度范围为45-70℃，能够在较为恶劣的环境下正常工作。

从外观来看，该电源的外形尺寸为长198mm×宽109mm×厚50mm，设计紧凑，便于安装和使用。此外，部分厂家还提供定制服务，包括外包裝、图案和LOGO的定制，满足不同客户的需求。

在价格方面，S-300-12V开关电源的价格因厂家和购买数量的不同而有所差异。一般来说，单个价格在100元左右，而批量采购时价格会相对较低。

The S-300-12V switching power supply is a high-performance power device with a wide range of applications. It features an input voltage range of 170-264V, which can accommodate voltage fluctuations in different regions. With an output power of 300W, a stable output voltage of 12V, and an output current of up to 25A, this power supply can provide reliable power support for various devices, such as LED light strips and surveillance equipment.

In terms of performance, the S-300-12V switching power supply employs pulse width modulation (PWM) and boasts an efficiency of up to 90% and an output ripple noise as low as 50mV, ensuring stable and reliable operation of the devices. It can operate within a temperature range of 45-70℃, making it suitable for harsh environments.

The power supply has a compact design with dimensions of 198mm in length, 109mm in width, and 50mm in thickness, which facilitates easy installation and use. Additionally, some manufacturers offer customization services, including packaging, pattern, and logo customization, to meet the diverse needs of customers.

Regarding price, the cost of the S-300-12V switching power supply varies depending on the manufacturer and the quantity purchased. Generally, the price for a single unit is around 100 yuan, while bulk purchases can lead to lower prices.