What is the Voltage Output of Poe Switch?

In industrial network deployments, industrial PoE (Power over Ethernet) switches have become key components for connecting various devices, thanks to their ability to simultaneously transmit data and power. The PoE switch voltage output directly affects device compatibility, stability, and application range, making it a crucial parameter to consider during selection.
What is the standard voltage of a PoE switch?
Among common industrial PoE switch port voltage outputs, 48 volts is the most widely used. This originates from mainstream PoE standards such as IEEE 802.3af and 802.3at. The IEEE 802.3af standard specifies an output voltage range of 44–57V, with a typical value of 48V; the 802.3at (PoE+) standard has a similar output voltage range, also commonly outputting 48V.
Why do industrial PoE switches typically use 48V output?
In industrial settings, higher requirements are placed on the electrical performance of equipment, including:
Long-distance transmission needs: In large factories or outdoor campuses, network cabling distances may exceed 100 meters. 48V DC voltage can effectively reduce voltage loss during transmission, ensuring stable operation of end devices.

Strong anti-interference capability: Higher voltage transmission is relatively more stable and has stronger resistance to electromagnetic interference.

Wide device compatibility: The vast majority of industrial cameras, control terminals, APs, and other equipment are designed for 48V power supply, which makes selection more flexible and system construction more efficient.

Good safety: 48V falls under the standard for safe DC voltage for humans, ensuring both power efficiency and safety.

Therefore, industrial PoE switches almost universally adopt 48V standard output, not only meeting the power demands of various industrial devices but also offering reliability for long-term operation. However, PoE switches also support 24V DC input voltage. For example, Come-Star’s 24V PoE switches are specifically designed for industrial environments where standard 48V power sources are hard to obtain. These switches use boost technology to efficiently convert wide-range 18–36V DC input to stable 48V PoE output, thus providing seamless power to devices compliant with IEEE 802.3af/at standards.
Do PoE switches support other voltage outputs?
Besides the standard 48V output, the market also offers some low voltage PoE switches, typically providing 24V or 12V non-standard outputs to meet certain special or customized needs. These devices are mainly used in retrofitting old systems or specific embedded scenarios.
24V PoE Switches
Common in certain industrial automation devices or older network cameras. Some industrial PoE switches offer 48V/24V switchable outputs to adapt to different terminal requirements.
12V PoE Switches
The output power is very low, suitable only for low-power devices such as sensors or small LEDs. The transmission distance is short, and voltage attenuation is significant, making it unsuitable for remote cabling. This is a non-mainstream configuration, and terminal device voltage requirements must be clearly confirmed before use.
Industrial PoE Switch Selection Advice
During actual selection, users are advised to consider the following factors based on the application scenario:
Operating temperature range (whether it supports -40°C ~ 75°C)
Power redundancy design (whether dual power input is supported)
Per-port power and total power budget Whether it is a managed PoE switch
Whether it supports IEEE 802.3af/at/bt standards
Summary
PoE technology greatly simplifies industrial network deployment, and the PoE switch voltage output determines its power supply capacity and device compatibility. The standard PoE 48 volt switch is the first choice in industrial applications, offering strong compatibility, stable transmission, and high safety. PoE switch 24V and PoE switch 48V are suitable for specific devices but must be used only after confirming terminal voltage requirements.
In actual deployment, fully understanding PoE voltage standards and device power consumption matching helps build a secure, efficient, and sustainable industrial intelligent network system.