Dual power supply, switching speed is the key.

Dual power supply is not finished by connecting two circuits of electricity, but by changing the switch in the middle. Many factories still 

use the traditional mechanical dual-power switch, which is driven by the motor to open and close the metal contacts. The structure lo-

oks solid and durable, and the switching speed is slow, least tens of milliseconds, and even hundreds of milliseconds to complete the 

switching under complex working conditions.

Don't underestimate the gap of tens of milliseconds. For precision industrial control equipment, servers and high-precision detection 

instruments, a few milliseconds of power failure will trigger the internal power failure protection mechanism and directly stop and res-

tart. For example, it's like a blink of an eye. The equipment has been judged as power interruption and started self-protection. The 

interruption time of tens of milliseconds is enough to stop the entire automated production line, and it will also cause data loss and 

system error in servers and storage devices.

If you want to realize uninterrupted power supply, you have to rely on STS static transfer switch to solve this problem. Its working prin-

ciple is completely different from that of the traditional mechanical switch. There are no wearable mechanical contacts, and the current 

switching is completed entirely by internal power electronic devices. The whole process can be controlled within a few milliseconds, so 

that the load equipment can not perceive the switching of power supply at all, and naturally there will be no shutdown or restart, so 

that the redundancy guarantee function of the dual power supply can be truly played.

Moreover, because there is no friction loss of mechanical parts, the service life of static switches is much longer than that of mechanical 

switches, and the problems of poor contact and contact aging are not easy to occur when switching frequently. Arc sparks will not be 

generated in the switching process, so it is safer to run in a closed power distribution cabinet, especially suitable for high-demand 

scenes that need high-frequency switching power supply.

Nowadays, STS static switch is used as the standard of dual power supply system not only in data room and communication base station, 

but also in many automatic processing workshops, precision electronic production lines and important medical equipment in hospitals. 

After all, compared with the tens of thousands or even hundreds of thousands of losses caused by a power outage, the cost of a set of 

static switches is not high, but it can make the dual power supply matching that was invested in the early stage no longer exist in name only.

You don't have to blindly pursue high power when choosing STS. According to the rated current of the back-end total load, a margin of 

about 20% is enough. If it is an unattended outdoor site or remote factory area, the model with standard communication interface is pref-

erred, so that the running status can be checked in real time and fault alarms can be received remotely without frequent on-site inspection, 

which can save a lot of operation and maintenance energy.

In the final analysis, the core goal of dual power supply is "uninterrupted", not "having two power sources". It is easy to spend a lot of money 

but fail to achieve the expected guarantee effect by only increasing the number of power sources and ignoring the switching link. Only by 

selecting the right switching components can each distribution power input be truly implemented.

If you need type selection and transformation, you can consult Baoweite for the scheme. Thank you for browsing. You can collect official website 

of Shenzhen Baoweite Power Supply Co., Ltd.