How many volts does a PoE power supply switch have

PoE switches typically provide 48 volts DC, with standard ranges from 44 to 57 volts depending on the IEEE standard and device requirements.Standard PoE VoltageMost PoE switches operate at 48V DC, which is the standard for IEEE 802.3af (PoE) and 802.3at (PoE+) devices . The voltage is negotiated between the switch and the powered device (PD) during initial connection, ensuring safe and appropriate power delivery . The IEEE 802.3af standard specifies a voltage range of 44–57V, while 802.3at (PoE+) uses a similar range, also commonly outputting 48V . Higher-power standards like 802.3bt (PoE++) can deliver up to 60–100W per port, still using voltages within this range .Industrial and Specialized VariationsSome industrial PoE switches may support 24V or 12V outputs for specialized or legacy devices, but these are non-standard and typically used for low-power sensors or short-distance connections . Industrial switches often include boost technology to convert lower input voltages (e.g., 18–36V DC) to the standard 48V PoE output, ensuring compatibility with standard PoE devices .Key PointsActive PoE (IEEE-compliant) safely negotiates voltage and power with the device.Passive PoE may inject fixed voltages like 12V, which can damage non-compatible devices .PoE voltage is delivered over Ethernet cables using either data pairs or spare pairs, depending on the mode (A/B/4-pair) and standard .The voltage level directly affects the amount of power that can be delivered; higher voltage allows more watts to be transmitted efficiently over longer cable distances . In summary, a standard PoE switch should provide 48V DC, with a safe operating range of 44–57V, ensuring compatibility with most PoE devices while maintaining efficiency and safety. Industrial or specialized switches may offer alternative voltages, but these are exceptions rather than the norm.