A 2003 Space Quality Inspection Sheet Reveals: How Zhejiang SanGao's Electrical Equipment Carried the Mission of Power Supply at the Launch Site

Do you remember the early morning of October 15, 2003? As the Shenzhou V manned spacecraft ignited and lifted off from the Jiuquan Satellite Launch Center, behind every light and every operating device in the ground control room lay a group of "unsung heroes"—among them, the "heart of power" produced by Zhejiang SanGao Electric.

In the 10kV distribution room responsible for the crucial power supply for the Shenzhou V launch, three devices bearing the "Zhejiang SanGao" label were online throughout the entire process: the ZW32-12 load switch, the FN5-12R load switch, and the HY5WS-12.7/50W lightning arrester. While these names may sound demanding, they perform life-saving tasks—a single spark in the power distribution system during a spacecraft launch could rewrite history.

Traditional Chinese products escort the "Shenzhou V"! SanGao brand switches appeared at the Jiuquan launch site, this wave of operations is stable

"Technologically advanced, unadulterated, and quality as stable as a stabilizing force!" The Jiuquan Launch Center gave the SanGao switchgear a rare high rating in its feedback document. Under extreme operating conditions of ultra-high voltage, high current, and 24/7 continuous operation, this batch of switchgear withstood the pressure of continuous operation. The after-sales team was on call 24 hours a day, and even the launch countdown was not delayed.

One aerospace engineer privately joked, "During launch, I'm most afraid of a draft in the distribution room, but SanGao's equipment is textbook quiet." This confidence stems from the fact that domestically produced power equipment played a crucial role in a manned space mission for the first time. The project manager revealed that even the temperature differential coefficient of a single screw was carefully considered during product selection, and SanGao responded to all doubts with a zero-failure record.

Twenty years later, this "Product Usage Feedback" with its red seal has long since yellowed, but the message at its conclusion remains resonant: "Adhere to promises, prioritize quality, and build a shield for the nation." Today, the new explosion-proof switches of SanGao have been used in the new generation of space launch sites, and the "old buddies" who escorted Shenzhou V back then are still waiting in the distribution room in Jiuquan for the next miracle of flying.

FAQs About Zhejiang SanGao’s Products in Shenzhou-5

Q: What exactly do load switches and arresters do in a power system?

A: Load switches control the flow of electricity, while arresters protect equipment from voltage spikes. Both are vital for keeping power systems stable—especially in high-stakes settings like space launch centers.

Q: Did any issues come up with the products during use?

A: No. Feedback notes the products performed well with no reported issues, from installation through the launch.

Q: Why is Zhejiang SanGao’s role in Shenzhou-5 significant?

A: It shows their products meet the strict standards of national defense and space missions—proof of their reliability.