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Overcurrent protection for Power over Ethernet (PoE) from SCHURTER

Transmitting both power and data over a single cable is an ingenious and simple idea – a "plug & play" solution. As the amount of current increases, so does the danger of fire. Thus it is essential to protect electronics from overcurrents, and SCHURTER offers just the right fuses to provide this protection.

Data networks based on the Ethernet standard are in widespread use around the world. Just a few examples of devices tied into these networks include sensors, IP phones, card readers, remote-controlled webcams, point of sales (POS) terminals and small hubs and servers. Since the Ethernet standard was introduced, data rates have continually increased and today are reaching speeds up to 100 Gigabits per second. Ethernet cable is also increasingly being used to supply devices with power in addtition to data over a single cable. There is also no need for a certified technician that might otherwise be required to install mains power.

Overcurrent protection

The higher the current, the faster malfunctions can lead to fires. Suitable devices to protect against overcurrents must be installed in both PSEs (power sourcing equipment) and PDs (powered device). The simplest, most cost-effective and reliable solution for protection against overcurrent is a chip fuse. In addition, they take very little space. The USF 0603 from SCHURTER is the ideal fuse for PoE applications. This thin-film fuse measures just 1.6 mm long, 0.8 mm wide and only 0.6 mm high. It offers overcurrent protection with super-quick-acting characteristics in a range of rated currents from 500 mA to 5 A. It stands out due to a breaking capacity of 50 A at 32 V over the entire range of rated currents. Even today, such breaking capacity is unmatched in fuses of this size.

Additional fuses suited for overcurrent protection in PoE applications on offer: the USFF 1206 and USF 1206. All fuses mentioned are approved to cURus.

Close to the customer

SCHURTER is your expert partner when it comes to circuit protection. SCHURTER supports its customers with extensive knowledge. And in cases where standard products are not exactly what you need, SCHURTER is happy to work out a customized solution.

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