Power

Fuses provide overcurrent protection

22nd June 2017
Alice Matthews
Datasheets

Transmitting both power and data over a single cable is a simple idea – a plug-and-play solution. However as the amount of current increases, so does the danger of fire, therefore it is essential to protect electronics from overcurrents and SCHURTER offers fuses to provide this protection. Data networks based on the Ethernet standard are in widespread use around the world and 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). According to SCHURTER, 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 a suitable fuse for PoE applications. This thin-film fuse measures 1.6mm long, 0.8mm wide and 0.6mm high.

It offers overcurrent protection with super-quick-acting characteristics in a range of rated currents from 500mA to 5A. It has a breaking capacity of 50A at 32V over the entire range of rated currents. Additional fuses suited for overcurrent protection in PoE applications are on offer: the USFF 1206 and USF 1206. All fuses mentioned are approved to cURus.

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